Jet JFM-5 - Maintenance and Sharpening; Chisel and Auger Sharpening Techniques; Lubrication and General Upkeep

16
Maintenance
Before doing maintenance
on the mortiser, disconnect it from the
electrical supply by pulling out the plug or
switching off the main switch. Failure to
comply may cause serious injury.
The mortiser requires only minor maintenance,
such as cleaning and lubrication and routine
adjustment and sharpening of the chisel and
auger.
Wipe down the mortiser after each use and, as
necessary, use light applications of oil or grease
to lubricate linkages, moving parts, etc.
If the power cord is worn, cut or damaged in any
way, have it replaced immediately.
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 20.
Use a small, triangular, smooth file to relieve the
inner corners of the chisel (Figure 21). 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 22.
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
Figure 20
Figure 21
Figure 22
exposed machine surfaces, such as dove-tailed
ways and slides.