Drill mounted clockwise.
Thinner primary facets at
the periphery.
Drill mounted anticlock-
wise. Wider primary facets
at the periphery.
Drill mounted correctly.
The width of the primary
facets are even.
Deviations from the Ideal Point Geometry
The drill bit does not necessarily need to be mounted with the edges exactly par-
allel to the horizontal lines. These two examples show the result if the drill is a bit
misaligned. The drill still works, but you should strive to get the edges parallel to
maximize the life of the drill. It is preferable if the primary facets are wider towards
the periphery than thinner.
The secondary facets S have been
ground too much leaving primary
facets too small.
Replication of the Primary Facets
If you have ground the secondary facets too much, then go back and grind carefully
on the primary facets again.
Lift and move the drill holder so the lug
(11) touches the stop P .
Loosen the wheel (6) and tilt the base
to an approx. horizontal position.
Tilt the base until the primary facet
touches the grindstone. Lock it securely.
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