Re: Torque wrench

[BJohn77777@aol.com]

In a message dated 96-05-10 11:11:57 EDT, you write:

>Dave asks:
>-----
>Just wondering something... Is a torque wrench still accurate when used
>with a crowfoot (offset wrench head) instead of the usual socket? It
>seems that the rotation center is an inch or so  past the end of the
>head when used with a crowfoot. It seems like the wrench would be
>calibrated to use a lever arm that ended in the head... do I need to
>make any sort of allowance for that?
>-----
>
>Definately. The instructions that came with your wrench should
>provide the equations for making the correction. If not, I can
>work them out for you.
>
>Keep in mind though that the technique of using torque to determine
>bolt stretch is by its nature not particularly accurate to begin
>with. Unless the offset involved is more than, say, ten percent
>of the effective length of the torque wrench (not the case with
>most crowfoot types) I wouldn't be too concerned about calculating
>the correction.
>
>Eric T.     '86 5kS
>erict@ra.cta.com

And if you can set the crow's foot at 90 degrees to the wrenches head you
will not need to calculate effective lenght...

Bruce Johnson
85 4Kcsq
Olympia, WA