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TAP SHARPENING, Continued . . . Smaller sizes of taps are generally reconditioned by grinding the chamfer portion only, while larger taps may also require flute grinding. Taper pipe taps must be sharpened by grinding the flutes and spiral-pointed taps must be reground in the angular portion of the flute as well as on the chamfer. In any type of reconditioning, it is generally advisable to duplicate the previous grind as close as possible. The chamfer must be true and uniform, and the original amount of relief should be maintained. Hand grinding of chamfers is not recomended; however if it is done, it should be done only in the simple fixtures or machines sold for this purpose. |
