After grinding the primary facets, the drill
holder is moved forward to a second stop
S for grinding the secondary facets, which
gives the drill a 4-facet point.
The drill is ground to a 4-facet point.
The Primary facets, P and the
Secondary facets, S meet in the
centre and form a point.
The high precision drill holder consists
of two identical parts. The drill will be
exactly centered and both of the cutting
edges will be sharpened exactly to the
same shape.
The drill is mounted in a Drill Holder (3)
on a Guide (2), which in turn runs on a
Base (1). You move the drill across the
grindstone – the grinding automatically
takes place on the highest spot of the
stone.
The grinding depth for the first two
facets is determined by adjusting a
setting screw which has a stop, P.
These initial facets are called
primary facets.
After grinding one facet, the drill holder
is turned 180° and the other facet is
ground to an identical shape. Now both
of the two primary facets are ground.
This is How the Attachment Works
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