KnKut 5 Piece Carbide Tipped Hard Steel Drill Bit Set - hardened steel drill bit

The optimal angle for drill bits depends on the material being drilled. Common angles for drill bits include 118 degrees and 135 degrees. Different angles are suitable for different materials, such as 118 degrees for softer materials and 135 degrees for harder materials like metal.

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Lubricant of some type should always be used with HSS to prolong the life and slower speeds are safer. Solid carbide always gets max rpm when I use it as manual mills cannot get anywhere near the speed ideal for this type of tooling.

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The only downside with reducing cutting speed on a benchtop hobby machine is you loose some grunt from the motor if it’s an electronic variable speed. I tend to favour upping the spindle speed, keep the same modest chip load which therefore needs an increase in feed rate but reduce DOC if rigidity is a problem.

To keep a drill bit sharp, you can use a sharpening tool designed for that purpose. Follow the manufacturer's instructions or seek professional assistance to ensure proper sharpening and maintain the bit's cutting effectiveness.

There could be several reasons why you are having trouble drilling a screw. It could be due to using the wrong size or type of drill bit, insufficient pressure or speed, or issues with the screw itself. Proper technique and equipment are crucial for successful drilling.

To keep a drill bit tight, ensure that the chuck is securely tightened around the bit. Regularly check the tightness during use and make any necessary adjustments to maintain a secure connection.

A drill bit may wobble if it is bent, damaged, or improperly installed in the chuck. Wobbling can also occur if the drill's speed is too high or if there are issues with the drill's bearings. Using a damaged or incorrect drill bit can lead to wobbling.

It is generally recommended to use a drill bit slightly smaller than the screw diameter to ensure a secure fit. This allows the threads of the screw to grip the surrounding material properly.

Drill bit wandering can occur when the bit slips or deviates from the desired drilling path. This can happen if the bit is not properly centered, if the material is too hard or slippery, or if the drilling technique is incorrect. Applying consistent pressure and using a center punch can help minimize wandering.

Depends a bit on the cut as to whether you are flattening the top of a part or milling the side, top you may want to go a bit slower and also reduce the feed a bit depending on stepover..

Good Evening Dougie – Do you have a copy of Machinery’s Hand book you can refer to? This shows how to calculate your cutting speed from the formula V=Vopt x Ff x Fd

If you have a table of rpm for drills then the same rpm can be used for mills of equal diameter as well. As Duncan says above not cutting fast enough will quickly overheat and blunt the edges. You should be getting chips coming off as waste, if it is very fine slivers or dust then you are feeding too slowly.

Yes, it is possible to sharpen a drill bit by hand using a specialized drill bit sharpening tool or a bench grinder. However, sharpening drill bits by hand requires skill and practice to achieve proper results.

The speed /feeds recomended above ,are correct,but they are based on industrial use,with a good rigid machine and no doubt assume pumped suply of soluble oil, you do not state your machine,a lightweight hobby machine can be a bit light on spindle rigity so try reducing the speed down to 70/80 ft per min with sufficient feed to avoid rubbing,and decent tool lubrication, reducing speed does not harm HSS ,it will increase tool life,the job takes longer ,so what its a hobby not a production line.

It is often advisable to drill a pilot hole before screwing into certain materials like wood or metal. The pilot hole provides a guide for the screw and helps prevent the material from splitting or the screw from breaking.

I’ve just bought a new 1/2″ dia hss one and wondered if anyone can give me a ballpark figure of the correct spindle rpm for this on En1a steel

Home › Forums › General Questions › End mill rpm This topic has 10 replies, 9 voices, and was last updated 25 January 2024 at 19:46 by old mart. Viewing 11 posts - 1 through 11 (of 11 total) Author Posts 18 January 2024 at 18:18 #708269 Dougie SwanParticipant @dougieswan43463 Hi I have blunted more end Mills than I care to remember I’ve just bought a new 1/2″ dia hss one and wondered if anyone can give me a ballpark figure of the correct spindle rpm for this on En1a steel Thanks Dougie Advert 18 January 2024 at 18:44 #708270 JasonBModerator @jasonb If you took a rule of thumb of 100ft / min cutting speed for steel with HSS that put you at 770rpm. Depends a bit on the cut as to whether you are flattening the top of a part or milling the side, top you may want to go a bit slower and also reduce the feed a bit depending on stepover..   18 January 2024 at 19:00 #708275 Ramon WilsonParticipant @ramonwilson3 Hi, You may find this simple chart of use Dougie. I wrote it out when I first started training and has done me fine ever since   You can simplify the formula to an approximation –  Cutting Speed x 4 divided by the diameter of the cutter in inches so your 1/2″ end mill at 100 ft per min would be 800 – just adjust it to suit the conditions/type of steel at the time Tug PS I should have said this is for HSS – carbide could be up to 5 times more if the machine is capable 18 January 2024 at 19:10 #708284 Gary YeadonParticipant @garyyeadon51936 Good Evening Dougie – Do you have a copy of Machinery’s Hand book you can refer to? This shows how to calculate your cutting speed from the formula V=Vopt x Ff x Fd I can send you copies if needed. Regard   Gary 18 January 2024 at 19:25 #708295 duncan webster 1Participant @duncanwebster1 Make sure you keep the tooth load up, feeding too slow causes the cutter to rub and go blunt very quickly Tubal Cain Workshop Handbook has useful info 18 January 2024 at 19:54 #708303 JasonBModerator @jasonb If its HSS coated with something like TiAIN then you can run faster, say 150ft/min plus which is 1200rpm Here is a 10mm at nearer 180ft/min, 10mm vertical DOC x 0.5mm horizontal DOC. 18 January 2024 at 20:18 #708311 Martin ConnellyParticipant @martinconnelly55370 If you have a table of rpm for drills then the same rpm can be used for mills of equal diameter as well. As Duncan says above not cutting fast enough will quickly overheat and blunt the edges. You should be getting chips coming off as waste, if it is very fine slivers or dust then you are feeding too slowly. Martin C 25 January 2024 at 10:25 #709931 Nigel McBurney 1Participant @nigelmcburney1 The speed /feeds recomended above ,are correct,but they are based on industrial use,with a good rigid machine and no doubt assume pumped suply of soluble oil, you do not state your machine,a lightweight hobby machine can be a bit light on spindle rigity so try reducing the speed down to 70/80 ft per min with sufficient feed to avoid rubbing,and decent tool lubrication, reducing speed does not harm HSS ,it will increase tool life,the job takes longer ,so what its a hobby not a production line. 25 January 2024 at 14:29 #709955 Tony Pratt 1Participant @tonypratt1 The ‘Little machine shop’ website has a useful speeds/feeds calculator. Tony 25 January 2024 at 15:21 #709963 JasonBModerator @jasonb The only downside with reducing cutting speed on a benchtop hobby machine is you loose some grunt from the motor if it’s an electronic variable speed. I tend to favour upping the spindle speed, keep the same modest chip load which therefore needs an increase in feed rate but reduce DOC if rigidity is a problem. 70ft/min on a 1/2″ cutter could be 20 to 25% motor speed so not where it is going to be putting out it’s full potential 25 January 2024 at 19:46 #710038 old martParticipant @oldmart I am afraid to use HSS endmills on steel and always use solid carbide or shell mills with carbide inserts if appropriate. The HSS are kept for aluminium or the finishing cuts on steel. Not being able to sharpen HSS is the main reason for keeping them for best. Used solid carbides sometimes com up on ebay and I have got some bargains, and reground ones are usually better value for home use especially if they are slightly undersize. Lubricant of some type should always be used with HSS to prolong the life and slower speeds are safer. Solid carbide always gets max rpm when I use it as manual mills cannot get anywhere near the speed ideal for this type of tooling. Author Posts Viewing 11 posts - 1 through 11 (of 11 total) Please log in to reply to this topic. Registering is free and easy using the links on the menu at the top of this page.

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Different drill bits are designed for specific materials and purposes. For example, twist drill bits are suitable for drilling through wood, metal, and plastic, while masonry bits are designed for drilling into concrete or brick.

The best size drill for home use depends on the tasks you typically perform. A versatile option for general home use is a drill with a 3/8 inch chuck, as it can handle a wide range of drill bits.

Drills are sized based on their diameter, usually expressed in inches or millimeters. The size corresponds to the diameter of the hole the drill can create.

My mini lathe won’t latch on Warco mill lubrication Lathe vibration in workshop Milling Cutter insert radius Clamp /Latch for screw on chucks. Renishaw touch probe bits Mounting boring bar in the lathe Diesel Thiel Nassovia vertical metal saw Mini Mill Switch Controller Help Please

The most popular drill size can vary depending on the context and specific application. Commonly used drill sizes include 1/4 inch, 3/8 inch, and 1/2 inch.

If your drill is not catching the drill bit, it may be due to a loose chuck or worn-out jaws. Ensure that the chuck is securely tightened around the bit and consider replacing the chuck or seeking professional assistance if the problem persists.

Hi, You may find this simple chart of use Dougie. I wrote it out when I first started training and has done me fine ever since

The standard drill sizes typically range from 1/16 inch to 1 inch, with incremental increases of 1/64 inch or 1/32 inch.

If you use the wrong drill bit, several issues can arise. The hole may be too small or too large, resulting in an improper fit for the screw. Additionally, using the wrong bit can cause the drill to slip, damaging the workpiece or causing injury.

You can simplify the formula to an approximation –  Cutting Speed x 4 divided by the diameter of the cutter in inches so your 1/2″ end mill at 100 ft per min would be 800 – just adjust it to suit the conditions/type of steel at the time

I am afraid to use HSS endmills on steel and always use solid carbide or shell mills with carbide inserts if appropriate. The HSS are kept for aluminium or the finishing cuts on steel. Not being able to sharpen HSS is the main reason for keeping them for best. Used solid carbides sometimes com up on ebay and I have got some bargains, and reground ones are usually better value for home use especially if they are slightly undersize.

The direction in which you drill a hole depends on the specific task and your personal preference. Drilling can be performed in either a clockwise (right) or counterclockwise (left) direction, depending on the type of drill and the desired outcome.

To determine your drill size, you can refer to the markings on your drill bit or measure the diameter of the bit using a caliper or ruler.