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Rifles, Reloading, Optics, Equipment
Gunsmithing
Assemble My Own Rifle?
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<blockquote data-quote="ntsqd" data-source="post: 2407121" data-attributes="member: 93138"><p>You've sent iit out and had it calibrated? You're that outlier then.</p><p></p><p>In High School Auto Shop our instructor gave us an obvious lesson in just how badly we can gauge torque. He had one of the football players (wide receiver, not a lineman) "torque" all of the cylinder head bolts on a small block chevy by feel and asked him to try to be as consistent as possible. Our instructor then used a beam torque wrench and had another student read the indicator when each bolt broke loose and a third student write each number on the chalkboard.</p><p>They varied by over 50 ft-lbs! For a 120 ft-lbs target that's not a very good deviation!</p><p></p><p>I'm sure that someone more used to doing that work wouldn't vary as much, but it made a good point that I've remembered for 30+ years. To me that point is that if you are used to doing the work then you're likely to not vary as much, but for someone who is not used to doing that job using a torque wrench is a good idea. After all, how you 'tune' your feel for how tight stuff is, is to use the tool.</p><p></p><p>I'm more than OK with not using a torque wrench when the person doing the work is regularly tightening things and has a good feel for just how tight something needs to be. For a guy just starting out he won't have that feel and using a quality torque wrench is a very good idea.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2407121, member: 93138"] You've sent iit out and had it calibrated? You're that outlier then. In High School Auto Shop our instructor gave us an obvious lesson in just how badly we can gauge torque. He had one of the football players (wide receiver, not a lineman) "torque" all of the cylinder head bolts on a small block chevy by feel and asked him to try to be as consistent as possible. Our instructor then used a beam torque wrench and had another student read the indicator when each bolt broke loose and a third student write each number on the chalkboard. They varied by over 50 ft-lbs! For a 120 ft-lbs target that's not a very good deviation! I'm sure that someone more used to doing that work wouldn't vary as much, but it made a good point that I've remembered for 30+ years. To me that point is that if you are used to doing the work then you're likely to not vary as much, but for someone who is not used to doing that job using a torque wrench is a good idea. After all, how you 'tune' your feel for how tight stuff is, is to use the tool. I'm more than OK with not using a torque wrench when the person doing the work is regularly tightening things and has a good feel for just how tight something needs to be. For a guy just starting out he won't have that feel and using a quality torque wrench is a very good idea. [/QUOTE]
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Assemble My Own Rifle?
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