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17
Sharpening Chisel and Auger
The chisel and auger should be kept sharp for
best performance. If cutting operations require
excessive force, the chisel and/or auger are
probably dull and should be sharpened. Blunt
edges will give inaccurate mortises and can lead
to overheating and breakage of chisel or auger.
If chisel and auger are badly worn and become
difficult to sharpen, they should be replaced.
Chisel
Sharpen the chisel with a mortise chisel cutter
with the correct size pilot. (Pilot size will differ
depending on the size of your chisel.) Two or
three turns of the cutter in a carpenter’s brace
chuck should be enough to sharpen the chisel,
as shown in Figure 22.
Use a small, triangular, smooth file to relieve the
inner corners of the chisel (Figure 23). Remove
any burrs from the outside of the chisel with a
fine oilstone.
Auger
Sharpen the auger by using a small, smooth file,
following the original shape of the auger. File the
inside edge of the spur, the sides of the brad
point, and the cutting edge inwards toward the
flute of the auger. See Figure 24.
Do not file the outside edge of the spur, as this
will affect the diameter of the auger.
Lubrication
All ball bearings are sealed. They require no
further lubrication.
Periodically grease the gears, racks, and table
pivot points with a #2 tube grease.
Periodically clean and apply grease or oil to any
exposed machine surfaces, such as dove-tailed
ways and slides.
Figure 22
Figure 23
Figure 24