A CNC turning operation is set to cut an external metric thread on a steel workpiece. If the thread pitch and minor diameter are already specified, which parameter must be accurately programmed in the tool path to ensure the correct thread profile and depth?
Thread depth per pass value
On a CNC thread-cutting cycle the pitch fixes the axial advance and the minor diameter fixes the finished root size, so both are already set.
What still controls whether the correct thread profile and full depth are reached is how much the tool is fed in on each pass, that is the thread depth per pass value.
Setting this incorrectly leaves the thread shallow or overloads the tool, so it must be programmed accurately.
Hence, the parameter to program accurately is the thread depth per pass value.
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