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gage block

   Also found in: Wikipedia 0.01 sec.
gage block [′gāj ‚bläk]
(design engineering)
A chrome steel block having two flat, parallel surfaces with the parallel distance between them being the size marked on the block to a guaranteed accuracy of a few millionths of an inch; used as the standard of precise lineal measurement for most manufacturing processes. Also known as precision block; size block.


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As an example, if you need to confirm parallelism of two faces using a CMM, you could wring two gage blocks together (slightly offset).
In the United States, they had become so important that when the gage block supply was cut off during World War I, the government relieved the problem by having the Bureau of Standards (now NIST) develop a method to mass produce blocks for industry.
The contents are sorted by gage type and function with the less complex information first, covering line graduated measuring instruments, fixed gages, gage blocks, comparative length with mechanical and electronic indicators, pneumatic gages, electronic gages, engineering microscopes and optical projectors.
 
 
 
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