Reaming an Existing Hole
If you need to make an existing hole larger, you do not need to grind the secondary
facets. However the existing hole ∅ D must be larger than the chisel edge, C.
Turn the setting screw (13) lightly towards the grindstone and grind carefully
until the 4-facet point is established again.
Re-Sharpen Before the Drill Stops Working
Do not allow the drill to be worn so much that it starts to perform badly. Instead,
grind as soon as you notice that it does not work as it should, otherwise you need
to re-shape the point instead of just touching it up.
Keeping the Grindstone Active
If the efciency of the grindstone decreases during sharpening, you can easily
re-active it by using the coarse side of the Tormek Stone Grader SP-650. It brings
new grinding grains into operation and increases the efciency of the stone. The
Stone Grader can be especially useful when grinding thicker drills which have a
large grinding area.
Finer Surface
The Original Tormek Grindstone is 220 grit and gives a smooth cutting edge, ner
than from conventional high speed grinding. After you have ground the drill bit to
the right shape, you can use the ne side of the Tormek Stone Grader SP-650 to
grade the stone so that it corresponds to 1000 grit. Then you can further rene
the primary facets. The ner the surface of the edge – the better it will cut and the
longer it lasts.
When grinding smaller drills (up to approx. 6 mm or ¼") it is recommended that
you rene the grindstone from the beginning, since the stone otherwise can cut
too aggressively on a small drill.
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