What causes minor calibrations for wrenches

[stan]

hi all

any idea why minor calibration is needed for torque wrenches?
what causes the wrench to be out of range in the first place?





stan

 

[Astronuc]

hi all

any idea why minor calibration is needed for torque wrenches?
what causes the wrench to be out of range in the first place?

stan

It is customary in manufacturing to calibrate all measurement devices and the measuring or control systems of tools. This is ensure that the measuring devices and tools are accurate and reliable over time.

Drift in calibration may occur with usage, i.e. normal 'wear and tear'. In the case of a torque wrench, if one frequently uses the wrench at the upper limit of its range, one is more likely to find drift in calibration. Probably in most applications though, drift is not significant, and the routine calibration test is more for quality assurance.