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lubricate linkages, moving parts, etc.
Sharpening chisel and bit
The chisel and bit should be kept sharp for best
performance. Blunt edges will give inaccurate
mortises and can lead to overheating and breaka-
ge to chisel or bit. If chisel and bit are badly worn
and become difficult to sharpen, they should be
replaced.
• Sharpen the bit by using a small, smooth file, fol-
lowing the original shape of the bit. File the inside
edge of the spur, the sides of the brad point, and
the cutting edge inwards toward the flute of the
bit – see Fig. 6.
Do not file the outside edge of the spur as this will
affect the diameter of the bit.
2. Sharpen the chisel with a mortise chisel cutter
with the correct size pilot. (Pilot size will differ
depending on the size of your chisel.) Depen-
ding on the degree of wear, two or three turns
of the cutter should be enough to sharpen the
chisel, as shown in Fig. 7.
3. Use a small, triangular, smooth file to relieve the
inner corners of the chisel – see Fig. 8. Remove
any burrs from the outside of the chisel with a
fine oilstone.
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