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11
The diagram below illustrates how to use a fine grinding or sharpening stone to
hone the cutter blade by hand. It is imperative that the correct angles are main-
tained by using the gauge. Use a square to keep the cutting face perpendicular to
the base of the cutter blades.
DO NOT GRIND ANY OTHER FACES THAN THOSE SHOWN.
Ensure that the cutting edge never comes closer than 6mm from the seating key-
ways on the underside. Replace the cutter blades at or before this stage.
The diagram below illustrates how to touch up the head inserts. Be aware that
the inserts only act as stops for the cutter blades so they do not need to be as
sharp as the blades. Do not grind the facing edge more than 3mm deep – replace
the insert at this point – and do not exceed a cut of 6mm in the flat area as
shown.
DO NOT GRIND ANY OTHER FACES THAN THOSE SHOWN.
Figure 12. Sharpening the Cutter Blades
Figure 13. Grinding the Inserts
