On Sun, 18 Feb 2018 09:04:19 -0800, ultred ragnusen
wrote:

wrote:

Does anyone know how to calibrate a torque wrench at home?


Clamp head with handle horizontal; hang bucket of water measured
distance from head; add water until clicks; weight bucket; do sum.

On a diagram, I see how hanging a known weight a known distance from the
head will test the torque to see if it's correct ... but ...

And I can visualize how to mechanically clamp a bolt in a vise to hang the
torque wrench on - but then - how do you calibrate the two types?
Basically YOU can't. a beam type cannot be "calibrated" as the
flexibility of the torque arm is a function of the alloy, heat
tratment, and dimensions of the beam.
The spring tension an a "clicker" can be adjusted in various ways,
depending on the manufacturer/model. Someuse shims. Some use a simple
allen screw in the end. Some use a set of wedges, and some cannot be
recalibrated, period.