I have both 3/8" drive (0-450 in*lbs) and 1/2" drive (0-150 ft*lbs)
"click" style torque wrenches. The only problem I've ever had is when I
tried to use the larger wrench at the low end of the scale, like 25
ft*lbs (I don't think it's well calibrated down there). That's when I
decided to buy the smaller one to compliment the larger. A good wrench
should have instructions on how to use it. It is important that the
applicaiton of torque be smooth and that you apply load only on the
handle.
It's also important that the fastener be well lubricated otherwise there
won't be any correlation between torque and fastener pre-load which is
really what we're after. I may be getting too technical but it may be
important that the fastener and the part being fastened be at the same
temp. too.
Concerning calibration. It should be fairly straight forward to set up
some kind of bar with a weight hung off of it at a measured distance,
screw a bolt into a hole in the end which serves as a pivot, torque it
until the wrench is supporting the weight and see if it clicks or not.
Matt
Larry Hoy wrote:
>
> So is it possible to couple the two types of torque wrenches together, give
> them a twist, and find out if they read the same? I know this wouldn't tell
> you which one is inaccurate but if there is a differnce in the torque
> reading you would at least know one of them is "off".
>
> Larry Hoy
>
> > -----Original Message-----
> > From: owner-mgs@autox.team.net [mailto:owner-mgs@autox.team.net]On
> > Behalf Of Mike Lishego
> > Sent: Thursday, September 23, 1999 6:27 PM
> > To: John Walker; WSpohn4@aol.com; mgs@autox.team.net
> > Subject: Re: Someone Buy This Guy a Torque Wrench!
> >
> >
> > I coulda swore that someone on this list posted a while back about
> > the click-type torque wrenches. This guy said that they needed to
> > be re-calibrated by a factory every year or so.
> >
> > I believe it too. This summer, I bought a click-type torque wrench
> > to compliment my mechanical one. After accidentally dropping the
> > new torque wrench, I promptly snapped a water pump bolt on my other
> > car. I checked the torque against the mechanical type, and sure
> > enough, it was clicking at about 4 lbs. more torque than the
> > mechanical one.
> >
> > Michael S. Lishego
> > http://www.mgb.bc.ca/virtualgarage/
> > 1991 Mazda Miata
> > 1986 Plymouth Turismo T1
> > 1974 MGB
> >
> > >I highly recommend that all of you that have the click style
> > wrenches give
> > >them to your neighbor to use
> > >on his mini-van. Then go buy a good old mechanical torque wrench
> > to use on
> > >your LBC.
> > >
> > >-JW
> >
> >
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