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 Dec 9, 2012, 04:05 PM #1 applefiend95 macrumors regular   Join Date: Jan 2012 Torque I know this is totally irrelevant but i figured one you people may be good at this: Joe is using a torque wrench to tighten the head bolts his monster truck. The required torque is 80 foot-pounds. The wrench handle is 18” long. How much force does Joe have to apply to properly tighten the bolts? While he tightening, his wrench measures 29 foot-pounds at a particular point. He turns the bolt farther exactly 45 degrees. The measured torque is now 50 ft.-lbs. He turns the bolt farther exactly another 45 degrees. The measured torque is now 69 ft.-lbs. Predict how many more centimeters he must move the wrench handle to reach 80 foot-pounds of torque. Predict the torque at which the bolt will begin to break. the final torque they need to have is 11 => 80-69=11 help please. thanks in advance 0
Dec 9, 2012, 04:11 PM   #2
ashleypenny
macrumors member

Join Date: Dec 2012
Quote:
 Originally Posted by applefiend95 I know this is totally irrelevant but i figured one you people may be good at this: Joe is using a torque wrench to tighten the head bolts his monster truck. The required torque is 80 foot-pounds. The wrench handle is 18” long. How much force does Joe have to apply to properly tighten the bolts? While he tightening, his wrench measures 29 foot-pounds at a particular point. He turns the bolt farther exactly 45 degrees. The measured torque is now 50 ft.-lbs. He turns the bolt farther exactly another 45 degrees. The measured torque is now 69 ft.-lbs. Predict how many more centimeters he must move the wrench handle to reach 80 foot-pounds of torque. Predict the torque at which the bolt will begin to break. the final torque they need to have is 11 => 80-69=11 help please. thanks in advance
Joe needs to do his own homework else the bolts will break!
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 Dec 9, 2012, 04:23 PM #3 ideal.dreams macrumors 68000     Join Date: Jul 2010 Location: OH 1) Do your own homework, it'll benefit you later. 2) This is a forum for discussing iMacs, not Torque __________________  15" rMBP: 256GB SSD, 8GB RAM, 2.3 GHz Quad Core i7, OS X 10.9.2  White iPhone 5s: 32GB, iOS 7.1  White iPad Air 16GB + WiFi, iOS 7.1 0
 Dec 9, 2012, 04:48 PM #4 iohass macrumors regular   Join Date: Mar 2012 Location: Canada the answer is potatoe 0
 Dec 9, 2012, 04:49 PM #5 jkautosports macrumors regular   Join Date: Dec 2012 Location: New York, NY just use rf sin theta 0
 Dec 9, 2012, 05:34 PM #6 joe-h2o macrumors 6502a   Join Date: Jun 2012 The answer is twice half as much. 0
 Dec 9, 2012, 06:19 PM #7 digitalfailure macrumors regular   Join Date: Sep 2012 Joe should have used a snap on tech-angle torque wrench and then he could have watched the torque applied reading rise and see the torque applied for a given angle of rotation on a lovely LCD display. That way he'd get the head tightened down a damn site quicker 0
 Dec 9, 2012, 07:02 PM #8 mobilehaathi macrumors 601     Join Date: Aug 2008 Location: The Anthropocene It is quite simple really, [redacted]. But you know, you really should learn to do your own homework. __________________ The true way is along a rope that is not spanned high in the air, but only just above the ground. It seems intended more to cause stumbling than to be walked along. 0
 Dec 9, 2012, 07:21 PM #9 iJohnHenry Banned   Join Date: Mar 2008 Location: On tenterhooks It's patently obvious. 42. 2
Dec 9, 2012, 07:46 PM   #10
wordoflife
macrumors 604

Join Date: Jul 2009
Quote:
 Originally Posted by applefiend95 I know this is totally irrelevant but i figured one you people may be good at this: Joe is using a torque wrench to tighten the head bolts his monster truck. The required torque is 80 foot-pounds. The wrench handle is 18” long. How much force does Joe have to apply to properly tighten the bolts? While he tightening, his wrench measures 29 foot-pounds at a particular point. He turns the bolt farther exactly 45 degrees. The measured torque is now 50 ft.-lbs. He turns the bolt farther exactly another 45 degrees. The measured torque is now 69 ft.-lbs. Predict how many more centimeters he must move the wrench handle to reach 80 foot-pounds of torque. Predict the torque at which the bolt will begin to break.
for the unlined part, could you just use t=rf, so 80=1.5f, so f = 53.3 of force. 1.5 is from the 18 inches, convert your units.

for the bold part, wouldn't it be just anything over 80 ft/lb?

and the middle part 11 = 1.5f so the force is 7.3 (not sure about unit for this, I normally use newtons because i use SI units). Now how to get the centimeters from that force, not sure. might give you an idea though.

also, this could be totally wrong lol

Last edited by wordoflife; Dec 9, 2012 at 07:55 PM.
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