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1 7.4
GRINDING OF FORSTNER DRILLS
ATTENTION! Only the open types can be ground!
Grinding wheel: depending on the material the drill is made of, use a thin corundum or
thin diamond wheel.
Adjustment of the drill in the prism:
The outer and main cutting edges are placed directly on the grinding wheel.
Adustmen on the machine:
•
Tip angle: 1 80° left
•
Clearance anglel: to your requirement
•
Turning mechanism: fix in hole A
Grinding of the main cutting edges
:
•
Align the main cutting edge to the grinding wheel, so that the outer edge cannot be
hurt by the grinding wheel.
•
Grind the first main cutting edge from the inside to the outside
•
Reverse the prism and grind the second main cutting edge from the outside to the
inside
