slyck(at)frontiernet.net
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 Posted: Sat Oct 02, 2010 5:47 am Post subject: torque wrenches |
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Kolbers: I checked through some of the archives and didn't see anything on this, so I'll offer some.
I had recently bought another cheapo Harbor Fright click type torque wrench and checked it against
a Sears beam type. The beams are very consistent and durable but lack good resolution and convenience.
If you do use this method for calibration be sure to hold the pivot handle on the beam wrench in
a free position and not touching fore or aft as this changes the arm.
This wrench was the little $20 in lb model that goes from 20 to 200 inch lbs. 1/4" drive
It was fairly close but lacks some linear accuracy . -that is if you correct it at, for instance, 100 in lbs, it will be
slightly off at 175. The best way to overcome this deficiency would be to correct it for the setting you use most and
attach a little chart to the handle for others.
So, curiosity leading me on, I checked another old clicker I had, a longer handle 3/8" drive that I had used for a long time.
I had checked it several years ago and was satisfied with the accuracy. -Not so this time. It had gotten off by
an unacceptable degree. This model is very easy to adjust, with a little window for a screwdriver to stick in the handle.
-again, linear accuracy is not perfect.
I would imagine that a real, industrial quality torque wrench would be more accurate but all the clickers will shift
over time and use. Two things to remember: in spite of what you may have been told, do not adjust them to slack.
Always leave a small tension on the adjustment. This keeps the workings from shifting around and possibly
goofing up the calibration. two: each time you use the wrench (and after every setting change) click it
several times before doing the actual torque.
BB
all torqued up
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