PRECISION MEASURING AND GAGING - 03D1642 - LESSON 1/TASK 2
blocks and any other measuring tool used with them must be free of grease,
oil, dirt, and any 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 workpieces to avoid
scratching the measuring surfaces.
NOTE
When building gage blocks (wringing them together) to
obtain a desired dimension, care should be exercised
to avoid damaging them.
Step 1. To build or stack precision gage blocks (figure 31 on the following
page) to take measurements, bring the blocks together (view A) and move them
slightly back and forth. This minimizes scratching, as it will detect any
foreign particles between the surfaces.
Step 2.
Shift the blocks.
If the blocks are clean, they will begin to take
hold.
Step 3. Slide the two blocks together (view B), using a slight pressure and
a rotary motion.
Step 4.
Shift the gage blocks so that the sides are in line.
Any
combination of the gage blocks may be stacked together in this manner.
The
combination will be as solid as a single block.
NOTE
The adhesive force that binds the two gage blocks
together is a combination of molecular attraction and
the suction cup action due to the film of oil or
moisture on the surfaces being wrung together.
Separate the gage blocks by sliding them apart, using the same movement as
when wringing them together.
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