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Old 23rd November 2020, 18:35   #11
planenut
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How did you calibrate the luggage scale? Calibration against a standard implies that the standard is accurate. That's not so easy in a DIY situation. All you can do is calibrate the tool using first principles, applying a known load at a measured distance to create a calculable moment/torque. Clearly, the load/weight must be 'accurate' as well as the measurement. I reckon a low/medium priced tool that's accurate to within 10% of the indicated value is pretty good. You don't need an NPL certificate for a car tool.


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Well obviously I didn't.
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Old 23rd November 2020, 19:21   #12
Mike Noc
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I took all my torque wrenches to work and calibrated them using the brand new very expensive ones on site that came complete with calibration certificates.

Tightened a nut and bolt with my wrench on the bolt and theirs on the nut and made sure they both clicked at the same time set at various different torques. My old Norbar was spot on and one of my cheap ones was all over the place - depending on the torque setting it deviated from 6 to 16%.
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Old 24th November 2020, 13:34   #13
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I took all my torque wrenches to work and calibrated them using the brand new very expensive ones on site that came complete with calibration certificates.

Tightened a nut and bolt with my wrench on the bolt and theirs on the nut and made sure they both clicked at the same time set at various different torques. My old Norbar was spot on and one of my cheap ones was all over the place - depending on the torque setting it deviated from 6 to 16%.
I should visit you at work someday and ask you nicely to check mine for accuracy

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Old 24th November 2020, 13:49   #14
Mike Noc
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Bit of a journey Ian - that site is in Kettering.
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Old 24th November 2020, 13:55   #15
trikey
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I took all my torque wrenches to work and calibrated them:

I do the same, it helps when you have the quality lab at your disposal 🤣
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Lest we forget..
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Old 24th November 2020, 18:20   #16
macafee2
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Bit of a journey Ian - that site is in Kettering.
you have a long drive to work.

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Old 24th November 2020, 20:03   #17
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you have a long drive to work.

macafee2

I suppose you have to expect that if your car has over four hundred thousand miles on the clock Ian
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Old 25th November 2020, 10:17   #18
Mike Noc
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you have a long drive to work.

macafee2

Yep, and that is my nearest site.


You won't see me buying an electric car anytime soon.
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