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The Rockwell hardness test is a non-destructive testing method performed by comparing depth of indentations. The test is defined in ASTM E-18 and ISO 6508-1. The hardness test is named after the inventor of the Rockwell hardness tester machine...
During all aspects of design engineering, it is critical to ask how the design will be manufactured. “precision tools of the trade” explores manufacturing through the tools used to inspect and monitor designs as a part or assembly moves through an engineering process.
Each digital caliper, after being subjected to grinding dust, coolant splash, machining chips, and being handled by multiple people, has kept readings within .0005” of the target value. This means the calipers have not degenerated in accuracy at all with respect to the manufacturer’s given resolution and measurement accuracy numbers.
