Method and apparatus for grinding the tip of a twist drill
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United States of America Patent
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-
Feb 17, 1987
Issued Date -
N/A
app pub date -
Jul 16, 1985
filing date -
Jan 26, 1982
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Described herein is an apparatus for grinding a twist drill bit, especially for web thinning and split pointing of the tip of a twist drill. The apparatus includes a grinding disk and a drill bit holder movable relative thereto mounted on a support. The support may execute relative motion with respect to the grinding disk under cam control in two coordinates and using a grinding disk having an invariable profile, in order to produce tip grinding patterns of various types. Preferably, the cam control is performed by means of interchangeable templates so that it is possible, using only a single grinding disk, no longer subject to the necessity of dressing, to produce a multiplicity of tip surface patterns that are optimally adapted to the given drill bit geometry.
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