An Introduction To Drill Mill Machining - Workshop Press - drillmill

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Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

General Guidelines for 4-Facet Grind Drill Bit Size Point Angle Clearance Angle Notes & Recommended Tormek Jig InchDecimal InchFraction Metric (mm) Wire Number Letter Mild Metal, Wood Hard Steel < 0.125 < 1/8 < 3.0 > 31 118° 14° 11° Can't use the Tormek DBS-22 Drill Bit Sharpening Attachment with these bits -- they are too small. (See also Note 1, below) 0.125 - 0.250 1/8 - 1/4 3.0 - 6.0 31 - 1 A - E 118° 14° 11° Bits as small as 1/8 inch can be held in the Tormek DBS-22, but they can flex easily. A pin vice can assist with reducing this flex. Tormek DBS-22 0.250 - 0.500 1/4 - 1/2 6.5 - 12.0 F - Z 118° 11° 9° 0.500 - 0.875 1/2 - 7/8 12.5 - 22.0 118° 9° 7° > 0.875 > 7/8 > 22.0 Can't use the Tormek DBS-22 Drill Bit Sharpening Attachment with these bits -- they are too large Notes: One sharpener has used a precision pen vice (like the Starrett 166C ) with the Tormek DBS-22 to hold bits as small as wire number 61 (= 0.0390" ≈ 5/128" ≈ 1 mm). Material-Based Guidelines Material Type Point Angle Clearance Angle Notes Recom. Range Recom. Range Aluminium 118° 90 - 130° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Armour Plate 135° 135 - 140° 7° 6 - 9° Brass 118° 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze 118° 110 - 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze, High Tensile 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Soft 95° 90 - 100° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Medium 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Hard 110° 100 - 118° 9° 8 - 12° Cast Iron, Chilled 118° 118 - 135° 7° 5 - 9° Copper 118° 100 - 118° 14° 12 - 15° Iron, Malleable 95° 90 - 100° 14° 12 - 15° Magnesium and Alloys 95° 70 - 118° 14° 12 - 15° Monel Nickel 118 - 125° 11° 10 - 12° Nickel Alloys 135° 135 - 140° 7° 5 - 7° Plastic, Hot Set 90° 60 - 90° 11° 10 - 12° Minimum point angle on the Tormek DBS-22 Drill Bit Sharpening Attachment is 90°. Plastic, Cold Set 125° 118 - 135° 14° 12 - 20° Steel, Low Carbon 118° 110 - 118° 9° 7 - 9° Steel, Medium Carbon 118° 118 - 125° 9° 7 - 9° Steel, High Carbon 130° 118 - 145° 9° 7 - 9° Steel, Forged 130° 118 - 145° 11° 7 - 12° Steel, Alloy 118° 118 - 125° 11° 10 - 12° Steel, Stainless 115° 110 - 118° 11° 8 - 12° Steel, Stainless, Hard 125° 118 - 135° 7° 6 - 8° Steel, Manganese 145° 140 - 150° 9° 7 - 10° Notes & Comments Information regarding Grindstones If you pursue sharpening small bits (< 1/8 in / < 3.0 mm), A pin vice like the Starrett 166C is recommended. Having the pin vice's handle being larger than the knurled area allows the Tormek DBS-22 to hold the pin vice without it shifting. (Yes, that is something I learned the hard way.) You will need a good magnifying glass and good light. These are difficult to see with the naked eye (especially in poor light). Care must be taken when grinding the secondary facet on bits this small. It is very easy to over grind this. Check after each pass on the grindstone. Consider honing the primary grind with a high grit stone (e.g., Tormek SJ-250 Japanese Waterstone). There is no need to hone the secondary facet as it is merely to allow space for chip evacuation. Tertiary Facets Addition of a tertiary facet can be useful for helping to remove waste as the hole is drilled. There is no guidance on the angle for these; only that they need to be greater than the secondary facets. If an angle is needed: Secondary Facet = 20° Tertiary Facet = 45° The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

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Jobber drillbit size chart

Cobalt steel provides extended tool life compared to high-speed steel drill bits, and maintains the tool's toughness and hardness in high drilling temperatures.

Jobber DrillBit Set

Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

If you pursue sharpening small bits (< 1/8 in / < 3.0 mm), A pin vice like the Starrett 166C is recommended. Having the pin vice's handle being larger than the knurled area allows the Tormek DBS-22 to hold the pin vice without it shifting. (Yes, that is something I learned the hard way.) You will need a good magnifying glass and good light. These are difficult to see with the naked eye (especially in poor light). Care must be taken when grinding the secondary facet on bits this small. It is very easy to over grind this. Check after each pass on the grindstone. Consider honing the primary grind with a high grit stone (e.g., Tormek SJ-250 Japanese Waterstone). There is no need to hone the secondary facet as it is merely to allow space for chip evacuation. Tertiary Facets Addition of a tertiary facet can be useful for helping to remove waste as the hole is drilled. There is no guidance on the angle for these; only that they need to be greater than the secondary facets. If an angle is needed: Secondary Facet = 20° Tertiary Facet = 45° The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

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These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

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What is ajobber drillbit used for

Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

DrillbitlengthChart

Jobber length drillbits definition

For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

Mechanicslength drillbits vsjobber

Calculate surface speed SFM RPM and diameter - Inch. ... 34.9 feet / second 25132.7 inches / minute 23.8 MPH 638.37 meters / minute ...

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Jobber drillvs twistdrill

Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

2011717 — Welcome back Guest! Did you know you can mentor other members here at HM? If not, please check out our Relaunch of Hobby Machinist Mentoring Program!

2014428 — For example, conventional methods is neutral, just meaning "usual methods", but conventional thinking is more negative, meaning ...

This optional attachment adds all the functions of a milling machine an existing lathe. Compatible with the WM 250 or WM 250V lathes.

No matter how many times I cut this, I can't get it long enough! Unknown Old Machinist Terminology for multi-facet grinds General Guidelines for 4-Facet Grind Drill Bit Size Point Angle Clearance Angle Notes & Recommended Tormek Jig InchDecimal InchFraction Metric (mm) Wire Number Letter Mild Metal, Wood Hard Steel < 0.125 < 1/8 < 3.0 > 31 118° 14° 11° Can't use the Tormek DBS-22 Drill Bit Sharpening Attachment with these bits -- they are too small. (See also Note 1, below) 0.125 - 0.250 1/8 - 1/4 3.0 - 6.0 31 - 1 A - E 118° 14° 11° Bits as small as 1/8 inch can be held in the Tormek DBS-22, but they can flex easily. A pin vice can assist with reducing this flex. Tormek DBS-22 0.250 - 0.500 1/4 - 1/2 6.5 - 12.0 F - Z 118° 11° 9° 0.500 - 0.875 1/2 - 7/8 12.5 - 22.0 118° 9° 7° > 0.875 > 7/8 > 22.0 Can't use the Tormek DBS-22 Drill Bit Sharpening Attachment with these bits -- they are too large Notes: One sharpener has used a precision pen vice (like the Starrett 166C ) with the Tormek DBS-22 to hold bits as small as wire number 61 (= 0.0390" ≈ 5/128" ≈ 1 mm). Material-Based Guidelines Material Type Point Angle Clearance Angle Notes Recom. Range Recom. Range Aluminium 118° 90 - 130° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Armour Plate 135° 135 - 140° 7° 6 - 9° Brass 118° 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze 118° 110 - 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze, High Tensile 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Soft 95° 90 - 100° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Medium 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Hard 110° 100 - 118° 9° 8 - 12° Cast Iron, Chilled 118° 118 - 135° 7° 5 - 9° Copper 118° 100 - 118° 14° 12 - 15° Iron, Malleable 95° 90 - 100° 14° 12 - 15° Magnesium and Alloys 95° 70 - 118° 14° 12 - 15° Monel Nickel 118 - 125° 11° 10 - 12° Nickel Alloys 135° 135 - 140° 7° 5 - 7° Plastic, Hot Set 90° 60 - 90° 11° 10 - 12° Minimum point angle on the Tormek DBS-22 Drill Bit Sharpening Attachment is 90°. Plastic, Cold Set 125° 118 - 135° 14° 12 - 20° Steel, Low Carbon 118° 110 - 118° 9° 7 - 9° Steel, Medium Carbon 118° 118 - 125° 9° 7 - 9° Steel, High Carbon 130° 118 - 145° 9° 7 - 9° Steel, Forged 130° 118 - 145° 11° 7 - 12° Steel, Alloy 118° 118 - 125° 11° 10 - 12° Steel, Stainless 115° 110 - 118° 11° 8 - 12° Steel, Stainless, Hard 125° 118 - 135° 7° 6 - 8° Steel, Manganese 145° 140 - 150° 9° 7 - 10° Notes & Comments Information regarding Grindstones If you pursue sharpening small bits (< 1/8 in / < 3.0 mm), A pin vice like the Starrett 166C is recommended. Having the pin vice's handle being larger than the knurled area allows the Tormek DBS-22 to hold the pin vice without it shifting. (Yes, that is something I learned the hard way.) You will need a good magnifying glass and good light. These are difficult to see with the naked eye (especially in poor light). Care must be taken when grinding the secondary facet on bits this small. It is very easy to over grind this. Check after each pass on the grindstone. Consider honing the primary grind with a high grit stone (e.g., Tormek SJ-250 Japanese Waterstone). There is no need to hone the secondary facet as it is merely to allow space for chip evacuation. Tertiary Facets Addition of a tertiary facet can be useful for helping to remove waste as the hole is drilled. There is no guidance on the angle for these; only that they need to be greater than the secondary facets. If an angle is needed: Secondary Facet = 20° Tertiary Facet = 45° The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

Addition of a tertiary facet can be useful for helping to remove waste as the hole is drilled. There is no guidance on the angle for these; only that they need to be greater than the secondary facets. If an angle is needed: Secondary Facet = 20° Tertiary Facet = 45° The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.

Notes: One sharpener has used a precision pen vice (like the Starrett 166C ) with the Tormek DBS-22 to hold bits as small as wire number 61 (= 0.0390" ≈ 5/128" ≈ 1 mm). Material-Based Guidelines Material Type Point Angle Clearance Angle Notes Recom. Range Recom. Range Aluminium 118° 90 - 130° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Armour Plate 135° 135 - 140° 7° 6 - 9° Brass 118° 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze 118° 110 - 118° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Bronze, High Tensile 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Soft 95° 90 - 100° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Medium 105° 100 - 110° (as above) 12 - 15° Clearance angles based on drill bit size should be used. Cast Iron, Hard 110° 100 - 118° 9° 8 - 12° Cast Iron, Chilled 118° 118 - 135° 7° 5 - 9° Copper 118° 100 - 118° 14° 12 - 15° Iron, Malleable 95° 90 - 100° 14° 12 - 15° Magnesium and Alloys 95° 70 - 118° 14° 12 - 15° Monel Nickel 118 - 125° 11° 10 - 12° Nickel Alloys 135° 135 - 140° 7° 5 - 7° Plastic, Hot Set 90° 60 - 90° 11° 10 - 12° Minimum point angle on the Tormek DBS-22 Drill Bit Sharpening Attachment is 90°. Plastic, Cold Set 125° 118 - 135° 14° 12 - 20° Steel, Low Carbon 118° 110 - 118° 9° 7 - 9° Steel, Medium Carbon 118° 118 - 125° 9° 7 - 9° Steel, High Carbon 130° 118 - 145° 9° 7 - 9° Steel, Forged 130° 118 - 145° 11° 7 - 12° Steel, Alloy 118° 118 - 125° 11° 10 - 12° Steel, Stainless 115° 110 - 118° 11° 8 - 12° Steel, Stainless, Hard 125° 118 - 135° 7° 6 - 8° Steel, Manganese 145° 140 - 150° 9° 7 - 10° Notes & Comments Information regarding Grindstones If you pursue sharpening small bits (< 1/8 in / < 3.0 mm), A pin vice like the Starrett 166C is recommended. Having the pin vice's handle being larger than the knurled area allows the Tormek DBS-22 to hold the pin vice without it shifting. (Yes, that is something I learned the hard way.) You will need a good magnifying glass and good light. These are difficult to see with the naked eye (especially in poor light). Care must be taken when grinding the secondary facet on bits this small. It is very easy to over grind this. Check after each pass on the grindstone. Consider honing the primary grind with a high grit stone (e.g., Tormek SJ-250 Japanese Waterstone). There is no need to hone the secondary facet as it is merely to allow space for chip evacuation. Tertiary Facets Addition of a tertiary facet can be useful for helping to remove waste as the hole is drilled. There is no guidance on the angle for these; only that they need to be greater than the secondary facets. If an angle is needed: Secondary Facet = 20° Tertiary Facet = 45° The Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a 6-facet grind, so values are not shown for it. A modification to the DBS-22 was made by Janne for 6-facet grinding, and more information can be found on the Tormek Forum. Secondary Point Angles (SPA) SPAs For tougher materials, an SPA is useful for reducing the stress on the outside cutting lip corners. (This is well outlined in Joseph Mazoff's document {see below}.) However, the Tormek DBS-22 Drill Bit Sharpening Attachment is not designed for a grinding SPAs, so it is not outlined here. Experience in using larger drill bits shows that SPAs help to reduce wander when drilling deep holes. On GadgetBuilder's web site (referenced below), it was noted: These extra facets cause the drill to have a stronger self centering action and the sharp outer point on the cutting lip is eliminated so the drill remains sharp longer. The chip is weakened by the difference in cutting action between the primary and SPA facets so long spirals are less common because the chips are prone to break. (...) When through drilling the SPA reduces or eliminates the exit burr on most materials. Again, on GadgetBuilder's web site, it was noted: Secondary Point Angles (SPAs) can be added to extend drill life, improve hole finish and minimize the exit burr on through-drilled holes. Notes: As symmetry of the grind would dramatically affect the use of the drill bit, be very careful to make them consistent. SPAs are not terribly useful on smaller drill bits. Addition of SPAs to a drill bit does not make this a 6-point grind; only adding tertiary facets does that. This may seem like a bit of a nomenclature thing, but it is important to be clear. More Information Books & Papers Drill Bit Geometry, by Joseph Mazoff. This is a truly great reference about drill bit geometry and is cited often. Drill Bit Sizes (Metric, Fractional, Letter, & Number) The Drill Press: Its Use and Application from Walker-Turner. TM 9-867 Maintenance and Care of Hand Tools from the U.S. War Department. Metal Cutting Tool Handbook Tap & Clearance Drill Sizes (Metric & Fractional) Tormek's "User Manual for the DBS-22 Drill Bit Jig" is quite useful. The Use and Care of Twist Drills, from the Cleveland Twist Drill Company. This small booklet (58 pages) is a great read, especially the part starting on pg. 54: "Common Drill Troubles and Causes". Videos & Presentations Sharpen drill bits with Tormek Drill Bit Sharpening Attachment (YouTube video) - a video from Tormek Tormek Live Sharpening Class - Part 6 - Drill bit sharpening (YouTube video) - a video from Tormek. It's time for drill bit sharpening! Learn how to sharpen your drill bits with maximum precision, to the greatest sharpness. We will show you how to create a 4-facet point which gives the ideal cutting performance. Tormek DBS-22 (YouTube video) - Jeff Fischer prepared this presentation. Sharpening bits with this jig could not be easier. Takes a little bit of getting used to, but then it is very simple to do a drill bit in a matter of minutes. Tormek Drill Bit Sharpening Attachment (YouTube video) - This short demonstration by Alan Holtham shows the set up and use of the Tormek DBS-22 Drill Bit Sharpening Attachment. One Tormek user noted that he reviews this video each time he uses the DBS-22 (as he does not use it often). Web Sites Jigs, Fixtures, & Modifications for the Tormek Some DBS-22 Drill Bit Sharpener Modifications are outlined. Mica Schmid posted a nice USB spacer jig which makes it easer and faster to set the USB relative to the grindstone, and it also helps ensure the stone is consistently flat relative to the USB. GadgetBuilder.com - has a page for building drill sharpening jigs. Viking Drill and Tool - Drill Bit Anatomy Tormek is a copyrighted logo of Tormek AB. Its presentation on this site is used to help the user quickly understand when specific Tormek tools, jigs, or setting are being used. For specific information regarding Tormek AB, or its products, please refer to the www.Tormek.com. Some information presented is from Tormek's handbook, Water Cooled Sharpening of Edge Tools. About this site Remember : The goal of sharpening is to produce sharp tools, and these tools can injure you if mishandled. Safety measures should be followed to protect yourself and those in your shop. Be sure to read and follow all instructions from the manufacturer, and and utilize proper safety equipment. Never consume alcohol or anything that could impair your judgement before sharpening tools, or using sharp tools. Comments can be sent via eMail to me at SharpeningHandbook@Gmail.com.