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Tool Talk Discussion Forum

the problem with torque wrenches;

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rhudson

05-19-2004 20:38:47




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they are an indirect and somewhat poor way of measuring what we are trying to achieve with threaded fasteners; clamping force due to stretch of the fastener (bolt). a much more accurate method is to directly measure the stretch of the bolt using a c frame mounted dial indictor (not practical in many cases). there are ultrasonic measuring methods that work great to measure the elongation of fasteners to achieve max strength with out exceeding yield point of the bolt. Many days i can be seen using my ultrasonic stretch indicator to properly tighten the bolts on my 1938 Allis WC. blood sugar must be low.

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IHC Red

05-23-2004 21:10:03




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  
Socket-size (in inches) = Cheater-pipe length (in yards). I have a full set... even for that elusive 19/32"

8-)



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Farmered

05-23-2004 04:58:12




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  
I always let my air impact rap at least 5 times. That seems to be just about right. Its a little tough on the smaller bolts though. Ed



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Fawteen

05-22-2004 05:47:37




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  
My Dad allus said "Run 'er down til she strips, then back 'er off a quarter turn."



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KX

05-20-2004 08:38:10




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  
A old tractor guy who was trained by John Deere in Texas years ago said the instructor told them, tighten every bolt one half turn before it snaps off.



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Larry E

05-20-2004 18:46:13




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 Re: Re: the problem with torque wrenches; in reply to KX, 05-20-2004 08:38:10  
make it squeak and give it one more turn.....



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rustyfarmall

05-20-2004 04:43:29




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  
I also use the ultrasonic method, the sensor is located in my right shoulder. When my shoulder starts popping and making grating sounds, I know that particular bolt is tight enough.



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buck

05-19-2004 20:49:02




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 Re: the problem with torque wrenches; in reply to rhudson, 05-19-2004 20:38:47  

Is it then safe to say that if you are breaking off a lot of bolts on a particular day then ones blood sugar must be low. Shucks I always thought it was the other way around. Like I must have eaten too many Wheaties this morning. Oh well live and learn.



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Dusty

05-20-2004 05:45:29




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 Re: Re: the problem with torque wrenches; in reply to buck, 05-19-2004 20:49:02  

I've worked on electrical gear where when cuped washers flaten out you stoped tightening. And other places where there was double headed bolts, when the first head twisted off you stoped.

Dusty



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