US Patent: 3,067,548
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| Drill Pointing Machine
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Patentee:
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| James C. Winslow (exact or similar names) - Sierra Madre, Angeles County, CA |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Jun. 06, 1960 |
| Granted: |
Dec. 11, 1962 |
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Patent Pictures:
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Joel Havens
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Description: |
| Abstract:
The present invention provides a grinding wheel for use on the prior drill pointing machine to adapt the latter to grinding conventional drill points. In such a conventional point, the lips of the drill are tapered toward their trailing edge to provide clearance but are not hollow ground.
Claim:
In a drill pointing machine, the combination of a frame, a rotary grinding wheel on the frame having a first coaxial grinding surface, the intersection of which with a plane containing the axis of the wheel is approximately a straight line, and a second coaxial, convex grinding surface which merges approximately tangentially with said first grinding surface along a coaxial zone of tangency, a drill holder on the frame, and means for effecting initial relative movement between said holder and the grinding wheel to bring the tip of a drill in the holder and said first grinding surface into initial contact with the drill axis inclined at a predetermined angle to the first grinding surface and subsequent relative movement of the drill and grinding wheel past one another in such manner that the relative movement of the drill with respect to the wheel is a compound movement involving relative, approximately axial movement of the drill toward said first grinding surface and simultaneous relative lateral movement of the drill toward said second grinding surface and finally across said coaxial zone of tangency of said grinding surfaces, and means for rotating the drill in synchronism with said relative movement between the drill and grinding wheel. |
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