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Car Forum / Acura Cars / July 2007

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How does a torque wrench work?

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Tegger - 17 Jul 2007 02:02 GMT
You always wanted to know, didn't you? I know I did.

http://www.tegger.com/hondafaq/torque_wrench/index.html

Signature

Tegger

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

Grumpy AuContraire - 17 Jul 2007 04:15 GMT
> You always wanted to know, didn't you? I know I did.
>
> http://www.tegger.com/hondafaq/torque_wrench/index.html

So now you have two working torque wrenches, eh?

JT
Tegger - 17 Jul 2007 13:56 GMT
Grumpy AuContraire <Grumpy@ExtraGrumpyville.com> wrote in news:XuWmi.172669
$Sa4.145889@bgtnsc05-news.ops.worldnet.att.net:

>> You always wanted to know, didn't you? I know I did.
>>
>> http://www.tegger.com/hondafaq/torque_wrench/index.html
>
> So now you have two working torque wrenches, eh?

You might say that, yes.

Too bad one of them is now random...

Signature

Tegger

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

Michael Pardee - 17 Jul 2007 14:00 GMT
> Grumpy AuContraire <Grumpy@ExtraGrumpyville.com> wrote in
> news:XuWmi.172669
[quoted text clipped - 9 lines]
>
> Too bad one of them is now random...

I was thinking the best way to compare them would be by finding a doohickey
that I could put a torque wrench on each end of and adjust until the clicks
were as simultaneous as possible.

Mike
Grumpy AuContraire - 17 Jul 2007 17:24 GMT
> Grumpy AuContraire <Grumpy@ExtraGrumpyville.com> wrote in news:XuWmi.172669
> $Sa4.145889@bgtnsc05-news.ops.worldnet.att.net:
[quoted text clipped - 8 lines]
>
> Too bad one of them is now random...

Just take it back and demand justice!

Remember, the whiny wheel sometimes gets the grease...

<G>

JT
Matt Ion - 18 Jul 2007 15:37 GMT
> Remember, the whiny wheel sometimes gets the grease...
>
> <G>

A whiny wheel usually means a bad wheel bearing ;)
Joe LaVigne - 17 Jul 2007 05:58 GMT
> You always wanted to know, didn't you? I know I did.
>
> http://www.tegger.com/hondafaq/torque_wrench/index.html

Doesn't the craftsman guarantee apply to torque wrenches?  I was under the
impression that it applied to every craftsman hand tool, and therefore,
your replacement should have been free...

Otherwise, cool information!
Fathergoose - 17 Jul 2007 11:26 GMT
> You always wanted to know, didn't you? I know I did.
>
> http://www.tegger.com/hondafaq/torque_wrench/index.html

=======================

Good Info, Thanks for sharing it!
Bill
z - 19 Jul 2007 21:31 GMT
> You always wanted to know, didn't you? I know I did.
>
[quoted text clipped - 4 lines]
>
> The Unofficial Honda/Acura FAQwww.tegger.com/hondafaq/

I made a lot of half-assed attempts to setup a cheap calibration
checker for my torque wrench using a gallon of water for a weight and
a measured lever arm, attached to a bolt that i could stick in a
socket attached to the wrench, pivoted relatively freely on something,
so I could see with a given torque load, at what setting  the wrench
started with the click. Never got it working, though. But doesn't it
seem like something you could do at home easily, if you were less of a
klutz than I?
Tegger - 20 Jul 2007 00:52 GMT
z <gzuckier@snail-mail.net> wrote in news:1184877067.710654.26610
@w3g2000hsg.googlegroups.com:

>> You always wanted to know, didn't you? I know I did.
>>
[quoted text clipped - 8 lines]
> seem like something you could do at home easily, if you were less of a
> klutz than I?

That's an interesting idea (I mean making the comparison, not you being
a klutz).

I had a bit of a think about it, and it really seems quite simple:
Immobilize one wrench in such a way as not to interfere with its action,
then hook another one up to it via the usual square drive.

http://www.tegger.com/hondafaq/misc/torque_wrench_comparing_1.jpg
http://www.tegger.com/hondafaq/misc/torque_wrench_comparing_2.jpg

Each wrench has a 1/2" to 3/8" adapter, then a 10mm socket, then a
section of 10mmm Allen rod connects the two.

I've barely got the click one clamped in, just tight enough to keep it
from falling through the vise. A quick measurement with a micrometer
shows no apparent distortion of the tube. Then I placed my hand on the
square drive end of the beam-type, just like you would if tightening a
bolt with extensions on the torque wrench.

Remember that the click-type's mechanism is internal to the tube. So
long as I do not interfere with the head's pivot pin or the tilt
mechanism inside, the readings should be unaffected by the vise.

I had the click-type set to only 30 ft lbs, so as to minimize any
malevolent forces should something slip.

The click-type wrench clicked as the beam type approached 30 lbs, but it
always clicked a couple of pounds short of 30 on the beam's reading.
Tolerance on the click-type is given as 4% up or down, so theoretically
a reading of 30 could actually mean anywhere between 28.8 to 31.2. And
heaven only knows what the tolerance is on my 35 year-old beam-type.

Signature

Tegger

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

Tegger - 20 Jul 2007 04:18 GMT
z <gzuckier@snail-mail.net> wrote in news:1184877067.710654.26610
@w3g2000hsg.googlegroups.com:

>> You always wanted to know, didn't you? I know I did.
>>
[quoted text clipped - 8 lines]
> seem like something you could do at home easily, if you were less of a
> klutz than I?

Huh. I sent a reply a couple of hours ago but it foes not seem to have
shown up anywhere. Here it is again:

That's an interesting idea (I mean making the comparison, not you being
a klutz).

I had a bit of a think about it, and it really seems quite simple:
Immobilize one wrench in such a way as not to interfere with its action,
then hook another one up to it via the usual square drive.

http://www.tegger.com/hondafaq/misc/torque_wrench_comparing_1.jpg
http://www.tegger.com/hondafaq/misc/torque_wrench_comparing_2.jpg

Each wrench has a 1/2" to 3/8" adapter, then a 10mm socket, then a
section of 10mmm Allen rod connects the two.

I've barely got the click one clamped in, just tight enough to keep it
from falling through the vise. A quick measurement with a micrometer
shows no apparent distortion of the tube. Then I placed my hand on the
square drive end of the beam-type, just like you would if tightening a
bolt with extensions on the torque wrench.

Remember that the click-type's mechanism is internal to the tube. So
long as I do not interfere with the head's pivot pin or the tilt
mechanism inside, the readings should be unaffected by the vise.

I had the click-type set to only 30 ft lbs, so as to minimize any
malevolent forces should something slip.

The click-type wrench clicked as the beam type approached 30 lbs, but it
always clicked a couple of pounds short of 30 on the beam's reading.
Tolerance on the click-type is given as 4% up or down, so theoretically
a reading of 30 could actually mean anywhere between 28.8 to 31.2. And
heaven only knows what the tolerance is on my 35 year-old beam-type.

Signature

Tegger

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

G-Man - 20 Jul 2007 15:26 GMT
I have a question.  How important is accuracy on a Torque Wrench?  I mean,
consistency seems more important to me.  If you are torqueing your lug nuts
to 85 lbs, and the wrench is off a little, you still get all the lugs
torqued to an even setting that keeps you from warping rotors.  I guess on
smaller items you may want to be a little more precise.  I have a small
Husky wrench that does inch lbs.

I have a couple of torque wrenches.  We took a socket and hooked them
together once and set them to the same setting.  Then we put pressure on
them and they both clicked at almost the same time.  So they are "close" for
sure.

I'l love to have a Snap-on model.  I'm a real tool whore :-)

G-Man
Tegger - 21 Jul 2007 01:31 GMT
> I have a question.  How important is accuracy on a Torque Wrench?

Not *that* important, but...it depends on the application.

Most automotive fasteners of any importance have substantial built-in
safety factors. Some do not, such as cam bearing cap bolts. Those only
torque to seven foot pounds, a lot lower than many people are used to
working with. Overtorque those enough and big trouble can surface.

>  I mean, consistency seems more important to me.

It is. Especially with stuff like head gaskets.

> If you are torqueing
> your lug nuts to 85 lbs, and the wrench is off a little, you still get
> all the lugs torqued to an even setting that keeps you from warping
> rotors.

Uneven nut torque is not nearly as significant a factor for brake
vibration as some other things.

> I guess on smaller items you may want to be a little more
> precise.

A LOT more precise. The smaller, the more fragile the threads.

> I have a small Husky wrench that does inch lbs.
>
[quoted text clipped - 4 lines]
>
> I'l love to have a Snap-on model.  I'm a real tool whore :-)

I own just one Snap-On tool, a 12mm six point combo wrench. Let me tell
you, after spending $35 on it, that thing gets the goose-down treatment.

I just like doing work properly. Tighten enough bolts and you eventually
acquire a "feel" for the "right" torque. This works in most cases, and
is necessary in situations where you have no room for the bulk of a
torque wrench. For the rest, I use the torque wrench.

I have neither broken a bolt nor had one come loose on me, since about
1985.

I did overtighten the auto tranny oil pan drain bolt (a very small bolt)
on my wife's '99 Tercel two years ago. The threads on the bolt shifted,
resulting in the need to replace the bolt. Luckily, the bolt threads
were softer than the pan threads, so a new bolt was all that was
required. I have been much more careful since.

Signature

Tegger

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

G-Man - 20 Jul 2007 15:27 GMT
I have a question.  How important is accuracy on a Torque Wrench?  I mean,
consistency seems more important to me.  If you are torqueing your lug nuts
to 85 lbs, and the wrench is off a little, you still get all the lugs
torqued to an even setting that keeps you from warping rotors.  I guess on
smaller items you may want to be a little more precise.  I have a small
Husky wrench that does inch lbs.

I have a couple of torque wrenches.  We took a socket and hooked them
together once and set them to the same setting.  Then we put pressure on
them and they both clicked at almost the same time.  So they are "close" for
sure.

I'd love to have a Snap-on model.  I'm a real tool whore :-)

G-Man

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