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Old Dec 9, 2012, 04:05 PM   #1
applefiend95
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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
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Old Dec 9, 2012, 04:11 PM   #2
ashleypenny
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Quote:
Originally Posted by applefiend95 View Post
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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Old Dec 9, 2012, 04:23 PM   #3
ideal.dreams
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1) Do your own homework, it'll benefit you later.
2) This is a forum for discussing iMacs, not Torque
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Old Dec 9, 2012, 04:48 PM   #4
iohass
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the answer is potatoe
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Old Dec 9, 2012, 04:49 PM   #5
jkautosports
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just use rf sin theta
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Old Dec 9, 2012, 05:34 PM   #6
joe-h2o
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The answer is twice half as much.
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Old Dec 9, 2012, 06:19 PM   #7
digitalfailure
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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

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Old Dec 9, 2012, 07:02 PM   #8
mobilehaathi
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It is quite simple really, [redacted]. But you know, you really should learn to do your own homework.
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Old Dec 9, 2012, 07:21 PM   #9
iJohnHenry
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It's patently obvious.

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Old Dec 9, 2012, 07:46 PM   #10
wordoflife
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Quote:
Originally Posted by applefiend95 View Post
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
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Last edited by wordoflife; Dec 9, 2012 at 07:55 PM.
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