THE BENCH NOTES

Workshop notes

How a small shop records a length check, and what that record is not.

Still-life of an outside micrometer, gauge blocks and a blank grid sheet on a wooden bench. — Explanatory still-life of the shop-check ingredients. Not a MeasureProof test.

Source-based note

Checking a 0–25 mm micrometer with gauge blocks

What a workshop record of repeats on known blocks can show, and why it is still not a UKAS certificate.

8 MIN READ

Source-based note

Zero and full scale is not enough

Why a zero setting plus one full-range block can miss mid-travel error, using Sparber’s published inch table as the example.

7 MIN READ

Source-based note

Caliper outside, inside and depth are different checks

An outside-jaw reading on a gauge block does not pass the inside jaws or the depth rod. Keep the three faces in separate columns.

8 MIN READ

Source-based note

Workshop check versus a UKAS certificate

A gauge-block comparison in the shop, a manufacturer inspection sheet and a UKAS certificate answer different questions.

7 MIN READ

Source-based note

Resolution is not capability

Display resolution, a stated accuracy figure and the scatter of a real check are three different numbers. Keep them in three columns.

6 MIN READ

These notes stop at the published sources.

Each page explains a workshop method or a distinction that the sources already make. Inch figures stay in inches. Millimetres are the default unit for a UK shop record. This publication has not published original gauge-block repeats.

Read the methods →