Machine tool manufacturers supplying machines to the gearing world have been in existence for many years. The
machines have changed and so has the acceptance criteria for the machines. Before the 1980’s the criteria for virtually all
machine acceptance was either a suppliers standard test job or the supplier producing one or two of the customers’ parts to
within a print tolerance. It wasn’t until about 1984 that we were required to perform a capability analysis for a machine
aceptance on a cylindrical hobbing machine. Capability requirements for bevel machine acceptance did not occur until
several years after that. Today virtually every customer requires a capability study on at least one parameter for at least
one type of part.
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