Do you have to tap-test after every tool change?
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The answer is no. If you are replacing the worn tool with a new of the same part number and manufacturer and that you are maintaining the same stick-out with a reasonable tolerance (Boeing says 0.010"). The dynamics of the assembly will not change and the Dashboard values will still work. If you are using a resharpened tool where the diameter and length have been changed significantly, the performance may also change.