PRECISION MEASURING AND GAGING - OD1642 - LESSON 1/TASK 2
USING PRECISION GAGE BLOCKS.
Do not leave blocks wrung together for long periods of
time since the surfaces in contact will tend to
(d) Ordinary changes in temperature have a significant effect on
The standard measuring
temperature is 68ƒF, which is just a little lower than the average
temperature in most shops. Since the room temperature affects the work as
well as the block, the expansion in the work will be matched in most cases
by a similar expansion in the block.
The coefficient of expansion of
several metals and blocks are listed below: