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Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999221 06/26/20
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nighthawk Offline
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So a johnson bar multiplies torque by magic? Note I said it wouldst amount to much with a crow foot, just use some caution not to go too far and break it. Changing the anger of the wrench shifts some of the force from radial to axial and so reduces accuracy of the torque wrench. (Don't know about you but a little explanation helps me understand and remember.)


The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.
BP-B2

Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999229 06/26/20
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Hubert Offline
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on a single nut or bolt it wont matter.. if it is a head bolt on an engine then use the same method on all the head bolts so they will all be the same...or anything that has multiple bolts...I was a auto mechanic for 30 years. (GM) trained.


Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999335 06/26/20
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nighthawk Offline
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I think we
re talking past one another, I'm not disagreeing with your last post.

[Linked Image]


The key elements in human thinking are not numbers but labels of fuzzy sets. -- L. Zadeh

Which explains a lot.
Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999887 06/26/20
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LoadClear had it correct in the first reply...

Phil

Re: Help from the mechanics re torque wrench... [Re: Greyghost] #14999900 06/26/20
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BobBrown Offline
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Originally Posted by Greyghost
LoadClear had it correct in the first reply...

Phil

And now we both have another post.



Happy Trails


Bob


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Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999939 06/26/20
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Jim in Idaho Offline OP
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And in case it's not perfectly clear yet... wink

Go to 0:13 to skip the annoying opening music.



Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #14999946 06/26/20
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Jim in Idaho Offline OP
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In other news, I posted this question to a forum specifically for this motorcycle and the answer there is "we don't need no stinkin' torque wrenches" - TFAR! Or just plain "TIGHT" in capital letters.


Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!
Re: Help from the mechanics re torque wrench... [Re: Jim in Idaho] #15000048 06/26/20
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SeanD Online Content
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It’s fine, 90 degrees is correct so the moment arm increase is minimized.

The truth is torque isn’t really that accurate of a way to consistently tension bolts. Use some thread locker or lube and your bolt tension goes way up for the same torque reading.

Torque is used for mechanical design all the time, for structural bolting we require other methods as torque is pretty inaccurate/inconsistent unless calibrated by testing.


Sean
Re: Help from the mechanics re torque wrench... [Re: SeanD] #15000124 06/26/20
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AJ300MAG Offline
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Originally Posted by SeanD
It’s fine, 90 degrees is correct so the moment arm increase is minimized.

The truth is torque isn’t really that accurate of a way to consistently tension bolts. Use some thread locker or lube and your bolt tension goes way up for the same torque reading.

Torque is used for mechanical design all the time, for structural bolting we require other methods as torque is pretty inaccurate/inconsistent unless calibrated by testing.


Yup. Bolt stretch is key to holding tension on the fastener, generally speaking index angle gets you there. Torque is just a quick and dirty way to get you in the ballpark.

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