American Machinist

Tapping into longer tool life. (Practical Ideas).

TAPS GENERALLY WEAR QUICKLY at the V-point of their thread profiles. These tips often break or chip, requiring more torque to run the tool. My idea prolongs tap life beyond this initial worn stage.

I grind a worn tap's teeth profiles down to about half their depth and pencil grind back-sloping clearance for free cutting action. …

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