Re: WHAT A BOLT IS, AND HOW IT WORKS

"Elle" <honda.lioness@xxxxxxxxxxxxxxxxxxxx> wrote in
news:Bq4bf.170$Xo.157@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx:

> "TeGGeR®" <tegger@xxxxxxxxxx> wrote
>> Each wheel has, of course, 4 nuts. Each lug nut was tightened by me
>> to 75 ft lbs back in the summer. Well, I just measured the torque
>> necessary to break them loose just now, in two pound increments on
>> the click-wrench.
>>
>> Guess what? Each one required about 90 lbs to crack free.
>
> For the archives, I think it's important to note that the torque
> wrenches accessible to the ordinary consumer are not supposed to be
> used to measure loosening torque.



It's not supposed to be used to measure loosening torque because of the
possibility of overloading the mechanism. 90 ft lbs is well within my
wrench's maximum of 150 lbs.

I started at 75, and worked my way up in 2 lb increments.

There is no harm done to a torque wrench used in such a manner.


---------------------

An update to yesterday: I picked up a nail in one tire two weeks ago. I
brought it to a tire place to get the puncture repaired, and watched while
the tire guy used a torque wrench to tighten the lug nuts. I noticed /all/
the tire guys were using torque wrenches as a matter of course.

By the pressure he appeared to be applying, I'd /guess/ the force used was
on the order of 100 lbs before the wrench clicked. I did not ask to see
what the setting was.

When I tried to undo the nust on that particular wheel yesterday, I reached
100 lbs with the torque wrench, with no apparent movement visible at the
nuts. I then laid aside the torque wrench, for fear of the very damage you
mention.

I enmded up having to STAND on an extended wrench, and bounce up and down
on it! I weigh 180 lbs, so I must have been applying removal torque of over
200 lbs before nuts came loose.

I'm wondering if removal torque increases exponentially compared to
tightening torque once you get closer to maximum tension.



--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
.

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