Disposable hob and method of grinding the same
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United States of America Patent
Stats
-
Jul 23, 1991
Grant Date -
N/A
app pub date -
Jun 14, 1990
filing date -
Jun 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A hob for cutting gear teeth includes a plurality of generally axially extending and generally circumferentially spaced rows of teeth. The hob is adapted to be thrown away instead of being re-sharpened when the cutting edges of the teeth become worn. Consistent with this, the teeth--rather than being formed with a conventional re-sharpenable profile--are ground so that the tip, the side flanks and the root of each tooth are of a circumferentially concave shape. The grinding is effected by a unique positional mode in which the hob blank is held stationary and in which the grinding wheel is located relative to the blank in such a manner as to enable the use of a wheel of the largest possible diameter for the design criteria of the particular hob being formed.
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