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TAP SHARPENING, Continued . . . Wear is greatly accelerated by the dullness of the tap. For example, a tap that has produced 2,000 tapped holes may be resharpened to its original usefulness with little effort and with the possibility of obtaining several additional sharpenings. However, if the same tap were allowed to produce 4,000 holes, it may be worn to a point where it is impossible to resharpen it satisfactorily. A determination of the number of holes to be produced by a tap must always include the factors of machine down-time for changing taps and the economic feasibility of resharpening. In many cases, it is most economical to run small taps until they will no longer produce satisfactory threads after which they are discarded. Larger and more expensive taps should be resharpened before wear becomes excessive. |
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PTC Pro Notes: |
