Reply To: Calibrating Micrometers

[Anonymous]

I'm mystified as to how one can check zero with a length standard, unless it's of zero thickness?

To set zero i simply close the micrometer anvils in the normal manner and tweak the thimble to read zero. I then use length standards, gauge blocks or screw together length bars (depending on what I have and the size of the micrometer) to check the full scale reading. I might also check some intermediate values as a sanity check on linearity.

Of courese it's not up to toolroom standards, but it's plenty enough for the standard my work needs.

Andrew