TM 9-243
USING AN ADJUSTABLE SNAP GAGE - Continued
3
Move the gage to the position shown above. If the
NO GO button (4) stops the gage, the shaft is within
limits.
4
If the gage can be rocked further to the position, as
shown, the part diameter is too small, since it has
passed the NO GO button.
HOW TO USE PRECISION GAGE BLOCKS
Before using gage blocks, remove the coat of rust-
preventive compound with a chamois or a piece of
cleansing tissue or by cleaning with an approved sol-
vent. Gage blocks and any measuring tool used with
them must be free of grease, oil, dirt, and other foreign
matter to avoid a lapping action whenever the block is
moved, and to ensure accurate measurement. When
using gage blocks, take particular care when measuring
hardened work to avoid scratching the measuring
surfaces.
NOTE
When building gage blocks (wringing
them together) to obtain a desired dimen-
sion, care should be exercised to avoid
damaging them.
1
Bring the blocks together flat and move them
slightly back and forth. This minimizes scratching,
as it will detect any foreign particles between the
surfaces.
15-7
