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2024-08-25 03:01:41

Joseph Von Benedikt visits with Aaron Oelger from Hodgdon about the unprecedented demand on the shooting supply industry.

SquarethreadChart pdf

in a subtle shift in zero, which could be a huge issue if the optic is paired with a precision rifle. I have a favorite AR carbine that has a complete suite of optics for various applications. Each optic has a dedicated mount and a note card that helps me remember where it sits on the rifle's 1913 rail.

"It is important that the mount is attached to the rail properly," said Cody Mitchell, a customer-service representative at LaRue, describing the lever-lock system. "You should start feeling contact when the lever is at a 45-degree angle to the rail. The lever should be tight to close and tough to open. That delivers the proper amount of force to hold the mount in position."

There is also a "Stub Acme" thread standard, identical in all respects to the one just described except for the height of the basic thread being 0.3P.

Definition. Depth of cut refers to the thickness of material removed in a single pass during machining operations like milling, turning, or drilling.

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The Acme thread form has a 29° thread angle with a thread height half of the pitch; the apex (or crest) and valley (or root) are flat. This shape is easier to machine (faster cutting, longer tool life) than a square thread. The tooth shape also has a wider base which means it is stronger (thus, the screw can carry a greater load) than a similarly sized square thread. This thread form also allows for the use of a split nut, which can compensate for nut wear.[8]

Squarethreadgauge

The rail has caught on, obviously, and is now used to hang bipods, lasers, and flashlights--the list is endless--on rifles, shotguns, pistols, and belt-fed machine guns. Regardless of the accessory, it sure is nice to know there is a system for optics that really works. Thanks to our friends at Picatinny Arsenal.

Please take a few minutes to complete this anonymous survey by Southwick Associates. Your input will help improve products and services for firearm owners. All responses are confidential.

Mikey Hartman, Lt. Col. (Ret.) of Israeli Defense Forces, joins David Fortier for an exclusive interview for Shotgun News.

The net effect is that the minimum thread heights are greater than "basic" for internal and external GP threads and for external Centralizing threads, and the maximum height for internal Centralizing Acme threads is shorter than "basic". The maximum diameter (within tolerance) at the crest of the external threads (called the max. major diameter of external thread) is that of the basic thread form and equals the "nominal diameter", D, stated in the screw's designation. The minimum diameter (within tolerance) at the crest of the internal thread (called the min. minor diameter of internal thread) is that of the basic thread form and equals the nominal diameter minus twice the basic thread height (i.e. D − P).

Squarethreaddimensions metric

The standardization was a windfall for the firearms industry. Manufacturers of guns, rails, bases, and rings all were on the same page, saving a lot of work and machining time. Shooters could now buy one mounting system that worked on a myriad of guns. The 1913 rail brings peace and happiness to the lives of optics editors everywhere since they swap scopes and mounts as often as most folks change their underwear.

Houtsma took the dimensions by committee over to the facility's production side and requested they design a dimensioning style so the rail could be easily produced and inspected. At a first glance, they commented that the rail was exactly like the one on a 105mm howitzer, just scaled way down. Under recoil, a howitzer's tube slides up and down a dovetail rail for repeatability. Turns out, it is important to put really big bullets in the same place miles away every time, too. The arsenal just coopted the howitzer rail production and inspection procedures for the new optics rail.

All Shooting Times subscribers now have digital access to their magazine content. This means you have the option to read your magazine on most popular phones and tablets.

Walther's new Performance Duty Pistol is ready for both concealed carry and conventional service situations. Available in different sizes and red dot ready, it'll fit your needs, whatever they are.

Squarethreadtypes

This isn't your grandpa's muzzleloading system. Federal has created a safer, easier and more reliable way to shoot a muzzleloader.

For maintaining air conditioning systems using R134a gas, a non standard "ACME" thread is specified for gas canisters.[12]

All Picatinny rails are supposed to be numbered, allowing the user to remount the optic in exactly the same position every time. Failure to do so can resultin a subtle shift in zero, which could be a huge issue if the optic is paired with a precision rifle. I have a favorite AR carbine that has a complete suite of optics for various applications. Each optic has a dedicated mount and a note card that helps me remember where it sits on the rifle's 1913 rail.

My initial research into the Picatinny rail revealed a world cloaked in myth and mystery; there are a lot of claims and counterclaims about who came up with what when. It was as if I was searching for the optic editor's Holy Grail. Then I found the Picatinny Arsenal website, called the number to a very nice public affairs office, and had the chance to talk with Gary Houtsma, a mechanical designer who spent the last 32 years of his career at Picatinny and actually was the lead project designer on the MIL-STD 1913 rail way back when.

SquarethreadBolt

When the mount is sitting in the recoil lug/cross slots before the lever or locking nuts are tightened, there will often be a little play. This front-to-back wiggle is a result of the mount's recoil-lug dimensions. They are slightly undersized so that they go into and come out of the slots easily. The mount should be pushed forward so that the lug contacts the slot's front wall, especially if the mount is subject to heavy recoil or rough handling.

All Picatinny rails are supposed to be numbered, allowing the user to remount the optic in exactly the same position every time. Failure to do so can result

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When created before 1895, Acme screw threads were intended to replace square threads and a variety of threads of other forms used chiefly for the purpose of traversing on machines, tools, etc. Acme screw threads are now extensively used for a variety of purposes. Long-length Acme threads are used for controlled movements on machine tools, testing machines, jacks, aircraft flaps, and conveyors. Short-length threads are used on valve stems, hose connectors, bonnets on pressure cylinders, steering mechanisms, and camera lens movement.[9]

Squarethreadspecification

The original trapezoidal thread form, and still probably the one most commonly encountered worldwide, with a 29° thread angle, is the Acme thread form (/ˈækmiː/ AK-mee). The Acme thread was developed in 1894 as a profile well suited to power screws that has various advantages over the square thread,[note 1] which had been the form of choice until then. It is easier to cut with either single-point threading or die than the square thread is (because the latter's shape requires tool bit or die tooth geometry that is poorly suited to cutting). It wears better than a square thread (because the wear can be compensated for) and is stronger than a comparably sized square thread. It allows smoother engagement of the half nuts on a lathe leadscrew than a square thread.[2][3] It is one of the strongest symmetric thread profiles; however, for loads in only one direction, such as vises, the asymmetric buttress thread profile can bear greater loads.

The thread form shown in the figure (Basic ACME thread profile) is called "basic". The actual thread heights on both the internal (nut) and external (bolt) threads differ from ⁠P/2⁠ by allowances (or clearances):

where Tr designates a trapezoidal thread, 60 is the nominal diameter in millimeters, and 9 is the pitch in millimeters. When there is no suffix it is a single start thread. If there is a suffix then the value after the multiplication sign is the lead and the value in the parentheses is the pitch. For example:

The whole world has gone rail crazy, and with good reason. The MIL-STD 1913 rail developed at the Picatinny Arsenal in New Jersey is not overly complicated, outrageously expensive, or even hard to manufacture. It is a simple accessory-mounting platform that has revolutionized the way we attach all manner of things--optics in particular--to our firearms.

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The line of General Purpose (GP) Acme threads (ASME/ANSI B1.5-1997) are not designed to sustain external radial loads and both the nut and bolt are, ideally, independently supported (the nut by a linear guide and the screw by shaft bearings). This is due to the need to avoid "wedging" of the thread flanks when subjected to radial loads, which would contribute substantially to friction forces and thread wear. However, there is a Centralizing Acme-thread standard (also specified in ASME/ANSI B1.5-1997) which caters to applications where the threads are not radially supported, where the roots and crests of opposing threads are designed to come into contact before the flanks do under radial loads. This adds the requirement that the sum of the allowances (clearances) and tolerances on the major diameters of nut and bolt be less than the sum of the allowances on the pitch diameters (PD). The drawback is that for a given amount of end play (axial clearance due solely to PD clearances), closer tolerances and a cleaner work environment are necessitated in the application of a Centralizing Acme thread.

Taurus has redesigned this sporting pistol for performance. Joseph Von Benedikt is with Jorge Spat to learn all about it.

Squarethreadcalculation

In addition to ensuring that delicate waxes can be removed without distortion, the mold cutter must cut the mold in such a way that the two halves will match up ...

Shortly after the U.S. military developed the technology to fight at night, the quest for a standardized mounting system began. All sorts of night-vision and night-aiming devices were being developed for individual and crew-served weapons, and those systems needed to come off when the sun came out yet put rounds on target when they were reinstalled at night.

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"We sent the finished product over to Rock Island Arsenal, where it was reviewed, and the rail was then sent out to all the different services for comment," Houtsma said. "The final design was then sent to our experts in the technical data section to determine if it should be a standard or a specification. They determined it was standard, not a specification, and did the final drawings. The rail was adopted and fielded in 1995."

Houtsma said there were no standards issued for the rail as for maintaining zero; those standards are met by the mount and optic. High-quality mount manufacturers take return-to-zero very seriously and have developed some ingenious methods of making sure the scope and muzzle are pointed at the exact same spot every time.

Every company had its own way of attaching the aiming devices, and each required its own mounting platform. Frustrated with all the configurations and dimensional variations of the different dovetail-mounting systems, the U.S. Army tasked the arsenal with developing a standardized mounting system. Advertisement ×

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Joseph Von Benedikt is with Rafe Nielsen of Browning to take a look at a new X-Bolt series rifle. Lighter and tougher and more precise than ever, it's the perfect back country hunting rifle.

The MIL-STD 1913 Picatinny rail is a dirt-simple system that has revolutionized the way we attach optics and accessories to firearms.The whole world has gone rail crazy, and with good reason. The MIL-STD 1913 rail developed at the Picatinny Arsenal in New Jersey is not overly complicated, outrageously expensive, or even hard to manufacture. It is a simple accessory-mounting platform that has revolutionized the way we attach all manner of things--optics in particular--to our firearms.My initial research into the Picatinny rail revealed a world cloaked in myth and mystery; there are a lot of claims and counterclaims about who came up with what when. It was as if I was searching for the optic editor's Holy Grail. Then I found the Picatinny Arsenal website, called the number to a very nice public affairs office, and had the chance to talk with Gary Houtsma, a mechanical designer who spent the last 32 years of his career at Picatinny and actually was the lead project designer on the MIL-STD 1913 rail way back when. Advertisement × Shortly after the U.S. military developed the technology to fight at night, the quest for a standardized mounting system began. All sorts of night-vision and night-aiming devices were being developed for individual and crew-served weapons, and those systems needed to come off when the sun came out yet put rounds on target when they were reinstalled at night. Every company had its own way of attaching the aiming devices, and each required its own mounting platform. Frustrated with all the configurations and dimensional variations of the different dovetail-mounting systems, the U.S. Army tasked the arsenal with developing a standardized mounting system. Advertisement × "We started on the project in 1992," Houtsma said. "Most companies were using a rail-grabber of some sort, but they were tight on some rails and loose on others. No one ever had standardized dimensions. We brought in different weapons that had rails from the weapons bunkers at Picatinny and even went out and picked up rails from sporting-goods stores. We sat down, measured the distances between a randomly chosen datum on the four 45-degree-angled surfaces and a height from the datum to the top of the rail on the 20 or so different rails, and came up with an average set of numbers."Houtsma took the dimensions by committee over to the facility's production side and requested they design a dimensioning style so the rail could be easily produced and inspected. At a first glance, they commented that the rail was exactly like the one on a 105mm howitzer, just scaled way down. Under recoil, a howitzer's tube slides up and down a dovetail rail for repeatability. Turns out, it is important to put really big bullets in the same place miles away every time, too. The arsenal just coopted the howitzer rail production and inspection procedures for the new optics rail. Recommended Advertisement "We sent the finished product over to Rock Island Arsenal, where it was reviewed, and the rail was then sent out to all the different services for comment," Houtsma said. "The final design was then sent to our experts in the technical data section to determine if it should be a standard or a specification. They determined it was standard, not a specification, and did the final drawings. The rail was adopted and fielded in 1995."The rail concept was not developed by Picatinny, merely refined and standardized. The Weaver rail long predated the 1913 rail but has several key dimension differences, most notably the width of the recoil lug/cross slot. The Weaver slot measures 0.180 inch in width, and the 1913 has a 0.206-inch slot. There are no Weaver standards for slot spacing. Standardized spacing was required for the Picatinny rail since some military optics at that time had two recoil lugs. The 1913 slot-spacing center is standardized at 0.394 inch. Most Weaver rings will fit a Picatinny rail, whereas some but not all Picatinny rings will fit a Weaver rail. It mostly depends on the dimensions of the recoil lug. Picatinny rails are usually numbered so that optics can be attached at the same point after removal. Failure to use the same slot can result in point of impact shifts.The standardization was a windfall for the firearms industry. Manufacturers of guns, rails, bases, and rings all were on the same page, saving a lot of work and machining time. Shooters could now buy one mounting system that worked on a myriad of guns. The 1913 rail brings peace and happiness to the lives of optics editors everywhere since they swap scopes and mounts as often as most folks change their underwear.Houtsma said there were no standards issued for the rail as for maintaining zero; those standards are met by the mount and optic. High-quality mount manufacturers take return-to-zero very seriously and have developed some ingenious methods of making sure the scope and muzzle are pointed at the exact same spot every time. Advertisement For example, LaRue Tactical makes some really nice optics mounts and guarantees absolute return to zero. On the firm's lock-lever mounts, a cam attached to a locking lever allows the mount to exert pressure on the rail from three directions, pulling the mount down onto the rail. The locking lever is adjustable, which allows the shooter to correct for rail tolerance, stacking, or a manufacturer's sloppy machine work."It is important that the mount is attached to the rail properly," said Cody Mitchell, a customer-service representative at LaRue, describing the lever-lock system. "You should start feeling contact when the lever is at a 45-degree angle to the rail. The lever should be tight to close and tough to open. That delivers the proper amount of force to hold the mount in position."When the mount is sitting in the recoil lug/cross slots before the lever or locking nuts are tightened, there will often be a little play. This front-to-back wiggle is a result of the mount's recoil-lug dimensions. They are slightly undersized so that they go into and come out of the slots easily. The mount should be pushed forward so that the lug contacts the slot's front wall, especially if the mount is subject to heavy recoil or rough handling. Advertisement All Picatinny rails are supposed to be numbered, allowing the user to remount the optic in exactly the same position every time. Failure to do so can resultin a subtle shift in zero, which could be a huge issue if the optic is paired with a precision rifle. I have a favorite AR carbine that has a complete suite of optics for various applications. Each optic has a dedicated mount and a note card that helps me remember where it sits on the rifle's 1913 rail.The rail has caught on, obviously, and is now used to hang bipods, lasers, and flashlights--the list is endless--on rifles, shotguns, pistols, and belt-fed machine guns. Regardless of the accessory, it sure is nice to know there is a system for optics that really works. Thanks to our friends at Picatinny Arsenal. Advertisement Video That May Interest You × GET THE NEWSLETTER Join the List and Never Miss a Thing. Email Address Sign Me Up

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Squarethreaddimensions chart

The rail concept was not developed by Picatinny, merely refined and standardized. The Weaver rail long predated the 1913 rail but has several key dimension differences, most notably the width of the recoil lug/cross slot. The Weaver slot measures 0.180 inch in width, and the 1913 has a 0.206-inch slot. There are no Weaver standards for slot spacing. Standardized spacing was required for the Picatinny rail since some military optics at that time had two recoil lugs. The 1913 slot-spacing center is standardized at 0.394 inch. Most Weaver rings will fit a Picatinny rail, whereas some but not all Picatinny rings will fit a Weaver rail. It mostly depends on the dimensions of the recoil lug.

Compared to square threads, disadvantages of the Acme thread form are lower efficiency due to higher friction and some radial load on the nut (angular offset from square).[4]

For example, LaRue Tactical makes some really nice optics mounts and guarantees absolute return to zero. On the firm's lock-lever mounts, a cam attached to a locking lever allows the mount to exert pressure on the rail from three directions, pulling the mount down onto the rail. The locking lever is adjustable, which allows the shooter to correct for rail tolerance, stacking, or a manufacturer's sloppy machine work.

The Mossberg 500 Pump Action Shotgun is one of the most popular home defense shotguns on the market. Joseph Von Benedikt shows his custom 500 and how well it shoots. Make sure to watch till the end. Who knew wild turkey's were so stupid!?

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Trapezoidal thread forms are screw thread profiles with trapezoidal outlines. They are the most common forms used for leadscrews (power screws). They offer high strength and ease of manufacture. They are typically found where large loads are required, as in a vise or the leadscrew of a lathe.[1] Standardized variations include multiple-start threads, left-hand threads, and self-centering threads (which are less likely to bind under lateral forces).

Joseph VonBenedikt is with Joel Hodgdon to talk about the improved accuracy and long-range potential of the already reliable Core-Lokt ammo line.

"We started on the project in 1992," Houtsma said. "Most companies were using a rail-grabber of some sort, but they were tight on some rails and loose on others. No one ever had standardized dimensions. We brought in different weapons that had rails from the weapons bunkers at Picatinny and even went out and picked up rails from sporting-goods stores. We sat down, measured the distances between a randomly chosen datum on the four 45-degree-angled surfaces and a height from the datum to the top of the rail on the 20 or so different rails, and came up with an average set of numbers."

The trapezoidal metric thread form is similar to the Acme thread form, except the thread angle is 30°.[4][5][6] It is codified by DIN 103.[7] While metric screw threads are more prevalent worldwide than imperial threads for triangular thread forms, the imperially sized Acme threads predominate in the trapezoidal thread form.

By J. Guthrie The MIL-STD 1913 Picatinny rail is a dirt-simple system that has revolutionized the way we attach optics and accessories to firearms.The whole world has gone rail crazy, and with good reason. The MIL-STD 1913 rail developed at the Picatinny Arsenal in New Jersey is not overly complicated, outrageously expensive, or even hard to manufacture. It is a simple accessory-mounting platform that has revolutionized the way we attach all manner of things--optics in particular--to our firearms.My initial research into the Picatinny rail revealed a world cloaked in myth and mystery; there are a lot of claims and counterclaims about who came up with what when. It was as if I was searching for the optic editor's Holy Grail. Then I found the Picatinny Arsenal website, called the number to a very nice public affairs office, and had the chance to talk with Gary Houtsma, a mechanical designer who spent the last 32 years of his career at Picatinny and actually was the lead project designer on the MIL-STD 1913 rail way back when. Advertisement × Shortly after the U.S. military developed the technology to fight at night, the quest for a standardized mounting system began. All sorts of night-vision and night-aiming devices were being developed for individual and crew-served weapons, and those systems needed to come off when the sun came out yet put rounds on target when they were reinstalled at night. Every company had its own way of attaching the aiming devices, and each required its own mounting platform. Frustrated with all the configurations and dimensional variations of the different dovetail-mounting systems, the U.S. Army tasked the arsenal with developing a standardized mounting system. Advertisement × "We started on the project in 1992," Houtsma said. "Most companies were using a rail-grabber of some sort, but they were tight on some rails and loose on others. No one ever had standardized dimensions. We brought in different weapons that had rails from the weapons bunkers at Picatinny and even went out and picked up rails from sporting-goods stores. We sat down, measured the distances between a randomly chosen datum on the four 45-degree-angled surfaces and a height from the datum to the top of the rail on the 20 or so different rails, and came up with an average set of numbers."Houtsma took the dimensions by committee over to the facility's production side and requested they design a dimensioning style so the rail could be easily produced and inspected. At a first glance, they commented that the rail was exactly like the one on a 105mm howitzer, just scaled way down. Under recoil, a howitzer's tube slides up and down a dovetail rail for repeatability. Turns out, it is important to put really big bullets in the same place miles away every time, too. The arsenal just coopted the howitzer rail production and inspection procedures for the new optics rail. Recommended Advertisement "We sent the finished product over to Rock Island Arsenal, where it was reviewed, and the rail was then sent out to all the different services for comment," Houtsma said. "The final design was then sent to our experts in the technical data section to determine if it should be a standard or a specification. They determined it was standard, not a specification, and did the final drawings. The rail was adopted and fielded in 1995."The rail concept was not developed by Picatinny, merely refined and standardized. The Weaver rail long predated the 1913 rail but has several key dimension differences, most notably the width of the recoil lug/cross slot. The Weaver slot measures 0.180 inch in width, and the 1913 has a 0.206-inch slot. There are no Weaver standards for slot spacing. Standardized spacing was required for the Picatinny rail since some military optics at that time had two recoil lugs. The 1913 slot-spacing center is standardized at 0.394 inch. Most Weaver rings will fit a Picatinny rail, whereas some but not all Picatinny rings will fit a Weaver rail. It mostly depends on the dimensions of the recoil lug. Picatinny rails are usually numbered so that optics can be attached at the same point after removal. Failure to use the same slot can result in point of impact shifts.The standardization was a windfall for the firearms industry. Manufacturers of guns, rails, bases, and rings all were on the same page, saving a lot of work and machining time. Shooters could now buy one mounting system that worked on a myriad of guns. The 1913 rail brings peace and happiness to the lives of optics editors everywhere since they swap scopes and mounts as often as most folks change their underwear.Houtsma said there were no standards issued for the rail as for maintaining zero; those standards are met by the mount and optic. High-quality mount manufacturers take return-to-zero very seriously and have developed some ingenious methods of making sure the scope and muzzle are pointed at the exact same spot every time. Advertisement For example, LaRue Tactical makes some really nice optics mounts and guarantees absolute return to zero. On the firm's lock-lever mounts, a cam attached to a locking lever allows the mount to exert pressure on the rail from three directions, pulling the mount down onto the rail. The locking lever is adjustable, which allows the shooter to correct for rail tolerance, stacking, or a manufacturer's sloppy machine work."It is important that the mount is attached to the rail properly," said Cody Mitchell, a customer-service representative at LaRue, describing the lever-lock system. "You should start feeling contact when the lever is at a 45-degree angle to the rail. The lever should be tight to close and tough to open. That delivers the proper amount of force to hold the mount in position."When the mount is sitting in the recoil lug/cross slots before the lever or locking nuts are tightened, there will often be a little play. This front-to-back wiggle is a result of the mount's recoil-lug dimensions. They are slightly undersized so that they go into and come out of the slots easily. The mount should be pushed forward so that the lug contacts the slot's front wall, especially if the mount is subject to heavy recoil or rough handling. Advertisement All Picatinny rails are supposed to be numbered, allowing the user to remount the optic in exactly the same position every time. Failure to do so can resultin a subtle shift in zero, which could be a huge issue if the optic is paired with a precision rifle. I have a favorite AR carbine that has a complete suite of optics for various applications. Each optic has a dedicated mount and a note card that helps me remember where it sits on the rifle's 1913 rail.The rail has caught on, obviously, and is now used to hang bipods, lasers, and flashlights--the list is endless--on rifles, shotguns, pistols, and belt-fed machine guns. Regardless of the accessory, it sure is nice to know there is a system for optics that really works. Thanks to our friends at Picatinny Arsenal. Advertisement Video That May Interest You × GET THE NEWSLETTER Join the List and Never Miss a Thing. Email Address Sign Me Up

Surface Feet Per Minute. Diameter: RPM: ; Rotation Per Minute. SFM: Diameter: ; Inch Per Minute. RPM: Number of Teeth: Chip Load Per Tooth: ; Chip Load Per Tooth.