Tap for cutting or chip-free machining thread in holes - in which thread run out of last threads lies outsides envelope of thread core diameters

摘要

The thread tap is used for cutting or swarf-free machining of thread in blind or through holes. The tap is integral with, or can be mounted on a shaft (B). The threads of the tap, which lie behind the thread which is cutting, have an increasingly larger core dia. The thread run-out of the last threads lie outside the envelope of the thread cores. The tap is made from material with a section in the shape of a three or more sided polygon with rounded corners. The core of the tap is round, this section is only interrupted by run-out grooves and by auxiliary cutting grooves. ADVANTAGE - More than one cutting edge is in engagement at the same time.