Grinding Of Knives - Hoffmann MORSO Operating Manual

BEWARE OF THE
EXTREME SHARP
KNIVES
Instructions Manual
MORSØ
Notch Cutting Machine
Model NF
SERVICE

Grinding of Knives

When grinding the knives you must only grind on
the reverse of the cutting edge. You must under
no circumstances grind on the front or ends of
the knives, because the knives will then be
destroyed. The angle of the cutting edge
compared to the front of the knife must be 28°.
Hollow grinding (recommended), figure I.
Using a grinding wheel the diameter must be
between 200 - 300 mm. Using a cup wheel the
diameter must be 150 mm.
Surface grinding figure II
Honing figure III
By setting the cutting edge you shall use a soft
fine-grained silicon carbide hand flat stone that
must be kept in oil or kerosene.
By setting the cutting edge you must under no
circumstances sharpen lengthwise of the cutting
edge, always crosswise.
First sharpen on the reverse side of the knife. The
flat stone is to be kept in an angle of 29°
compared to the front of the knife.
Take off burrs, figure IV
After the honing the burrs on the front of the knife
are taken off with a slate flat stone that must be
quite straight.
The flat stone must here be completely in line with
the knife, because otherwise the outer cutting
edge will get an incorrect angle.
Even the slightest error here will cause that the
knife presses too hard against the wood during
the cutting.
Please also see page H-4: Regulation of Draw Bar
H-3