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Old 12-05-2012, 11:38 AM  
Wuzzat?
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Default Any wrench = a torque wrench

I needed to adjust a timing belt tensioner to 33 lb-ft and there was no way my torque wrench would fit into the space available so I got two stiff springs from HD.

Filling a 5 gal bucket with water (2 lbs for the bucket + [5 gals x 8.3 lbs/gal]) = 43.5 lbs and stretched the spring 1.09" from its rest length so the spring constant K = 40 lbs/inch.

The spring was anchored on the wrench handle 7" from the center of the 3/8" drive stub so 33 lb-ft would need a right angle force of 33x12/7 = 57 lbs.

As it turned out the posted max force on the spring was 61 lbs (no max length given) so it was close. I should have done this calc. before I bought the thing but it worked out.
And with two springs in a package for $4 I could in principle go to 66 lb-ft or so.

Next is to check the K for my weaker springs from the basement.


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Old 12-05-2012, 12:42 PM  
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like this?


fish scale.jpg  
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Old 12-05-2012, 05:16 PM  
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Why don't you just go to the local parts store, most have tools they will rent or loan out.
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Old 12-06-2012, 01:26 PM  
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Quote:
Originally Posted by oldog/newtrick View Post
Why don't you. . .
It turns out that this wrench must have magical properties, because after I used it the car started and ran more smoothly than before.

Man, am I glad I can finally move this car out of the driveway!

I figure one hour round trip to the rental place, twice, so I calculate, "Can I make the part/tool/fixture in less time?"
This one was close.
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Old 12-06-2012, 02:15 PM  
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When I was young and couldn't afford such luxury as a torque wrench, I and all my back yard machanic friends had a fish scale in the tool box. If you notice a set of combination wrenches all have a different length. If you use one of these and give it a reasonable pull, you will be really close on the required torque for that size of bolt. The reason they give you a required torque is because an impact wrench can dammage aluminium parts you are bolting into.
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Old 12-07-2012, 10:08 AM  
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Good idea.
http://www.nextag.com/scales-fishing/compare-html


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