| 摘要 |
A drill point grinding machine having a selectively positionable workhead rotatably supporting a drill to be ground and a rotary grinding wheel that is positionable toward and away from the workhead. The machine has a control for selectively moving the workhead such that a drill carried thereby undergoes a first cyclic path of engagement with the grinding wheel for grinding a first drill point form and a second cyclic path of contact with the grinding wheel when a second drill point form is to be ground. The control is further selectively operable for causing the workhead to move a drill successively through said first and second cyclic paths for grinding a third drill point form. The machine control also is adapted to automatically move the workhead in the foregoing manner, as well as automatically advancing the grinding wheel to a position in close proximity to the drill prior to the grinding operation and then automatically feeding the grinding wheel a further predetermined amount during grinding.
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