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Compare it to another wrench? Or look up how to test a torque wrench, using a fixed weight.
Not sure how to do 5nm without looking it up in a reference book.
lynx-
But now we need to calibrate the weight, how do we know it is 1 1/4kg? Is the tape measure accurate? Is the square square? Are we pulling on the horizontal? Does the webbing strap have any stretch in it? The variables are endless.
I am joking, obviouslyAnd the link I was referring to is gone.
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1 newton meter = 0.102 kilograms of force applied to a 1 meter long lever.
Therefore, 10Nm of torque ≈ 1kg at the end of a 1m lever.
Find a 1m stick, tie 500g weight to the end, hold horizontal from the opposite end and the resulting force will get you v close to a bike wrench’s 5Nm reading. Some maths will accommodate a similar exercise with a 300mm wrench or something you can clamp to an Allen bit held by the torque wrench.
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Yeah, I'll bring it to work with me at some point and compare it to the torque wrenches in the workshop there.
Chaley
Muc-ed-off
ltc
How are you getting on with the Lifeline torque wrench? I stopped using mine for torque because I snapped a couple of bolts with it. Only set to 5nm so I think must be waaaay off. I've never snapped a bolt before!