 Break Away Torque, HOw to calculate |
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| Brett W |
 Mar 26 2006, 11:44 PM
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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 
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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? |
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| alpha434 |
Mar 26 2006, 11:47 PM
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My member number is no coincidence. Group: Members Posts: 3,154 Joined: 16-December 05 From: Denver, CO Member No.: 5,280 Region Association: Rocky Mountains |
Jeeze. I don't think that there is a way. There are other variables too. You have to take into account the amount of surface area making contact, the amount of pressure, whether or not the fastener has tightened or loosened itself since you put it on. And probly a lot more. The type of surfaces that are making contact and the surface finish of each.
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Posts in this topic
Brett W Break Away Torque Mar 26 2006, 11:44 PM
Brett W That's what we figured. We oiled the bolt and... Mar 26 2006, 11:56 PM alpha434 Well, don't do it with the air gun. Use a torq... Mar 27 2006, 12:02 AM Brett W I am torquing the nut with the torque wrench and t... Mar 27 2006, 12:10 AM alpha434 No no. Use the torque wrench on both operations. T... Mar 27 2006, 01:00 AM McMark It sounds like Brett is just trying to verify the ... Mar 27 2006, 01:15 AM alpha434 Mar 27 2006, 01:33 AM McMark You're right I guess I didn't finish my th... Mar 27 2006, 01:46 AM Joe Ricard Hmm, SO who really gives a rat's ass how much... Mar 27 2006, 06:18 AM groot Brett,
Considering we test all joints for clampin... Mar 27 2006, 07:06 AM Brett W I got these two new impact wrenches that are suppo... Mar 27 2006, 11:02 AM groot You definitely have too much time on your hands. H... Mar 27 2006, 11:47 AM Brett W It only took a couple of hours last night. I had ... Mar 27 2006, 07:48 PM jd74914 Hey Brett, is there anything special about the hon... Mar 27 2006, 07:59 PM Cap'n Krusty No way would I subject my air tools to 175 PSI. W... Mar 27 2006, 08:05 PM Brett W I normally leave our reg set at 100psi. We were j... Mar 27 2006, 10:05 PM jd74914 <... Mar 27 2006, 10:14 PM LvSteveH Actually, I think a fairly predictable formula cou... Mar 27 2006, 10:24 PM Brett W Sorry, the tubing is just a spacer because the bol... Mar 27 2006, 11:08 PM jd74914 Nice. Whats the advantage of building an intercool... Mar 27 2006, 11:29 PM Porcharu |
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