Break Away Torque, HOw to calculate |
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Break Away Torque, HOw to calculate |
Brett W |
Mar 26 2006, 11:44 PM
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#1
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Advanced Member Group: Members Posts: 2,856 Joined: 17-September 03 From: huntsville, al Member No.: 1,169 Region Association: None |
We all know that the torque needed to loosen a fastener is usually higher than the torque at which the fastner is tightened. Is there a way to calculate this number.
I just got a new 3/8 Impact wrench and was doing some test with it. We torqued a 1in course thread bolt to 250 ft-lbs. Then used this impact to break it loose. It did it with no problems at 175 psi. Couldn't touch it at 90psi. ANy body know how to calculate that torque? |
LvSteveH |
Mar 27 2006, 10:24 PM
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#2
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I put the Poor in Porsche Group: Members Posts: 1,080 Joined: 22-April 03 From: Las Vegas, Nevada Member No.: 600 |
Actually, I think a fairly predictable formula could be developed, or at very least a good rule of thumb. Your test rig has some issues though. You need to be torquing against a flat and unyielding surface, like a thick plate. The tubing is deforming and has the potential to act as a lock washer. If you used heavy wall tubing and a 1/2" plate as the surface, that would have very repeatable results.
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