here for a printer friendly version of Tip -
6-10, Pg 11-15,
Pg. 16-20, Pg.
of the mortising chisels are ground and honed with special
cone-shaped grinding stones mounted in the drill chuck. The
outside is then honed on a flat bench stone.
Even when new the chisels will usually need to be ground or
at least honed. All four corners as well as the edges MUST
be razor sharp. This is critical to the accurate operation
of the mortising accessory.
white conical grinding stone to sharpen the 1/4" chisel, and
the red conical grinding stone to sharpen the 3/8" and the
24-49. Construction details of a mortising chisel
grind mortising chisels, a support fixture must first be made
The fixture will be mounted to the miter gauge. Set up the
Mark V in the horizontal boring mode. Instead of mounting
a drill bit in the chuck, install the proper grinding stone
for the size chisel being ground.
the support fixture on the table. Set the chisel on the fixture
and back up the chisel with the rip fence. Hold the chisel
against the fixture and the fence, and center the chisel on
the grinding stone and lock the table in position.
24-50. Grinding a mortising chisel as shown. Retract
the quill and repeat until the stone stops removing
the power plant, with the stone mounted in the chuck, so that
the stone is 2" from the chisel. Extend the quill until the
stone touches the chisel and set the depth stop to 0
and allow the quill to retract. Warning: Be sure that the
speed dial is set to Slow, then turn on the machine.
Extend the quill until it contacts the chisel momentarily
then allow it to retract (Figure
24-50). Repeat this until the stone ceases to remove any
more metal. Inspect the tips and the edges of the chisel.
Look for the grinding burr on all edges and the four tips.
If there are still ungrounded surfaces or tips, repeat the
above steps to remove additional metal.
stone becomes loaded with metal particles, it can be cleaned.
Turn off the Mark V and apply a generous amount of oil to
the stone. Rub the oil into the stone to lift out the metal
After grinding is complete or the chisel has become slightly
dull, hone the mortising chisel on a flat bench stone and
the cone-shaped grinding stone.
24-51. Lay the chisel on a flat stone and move it
back and forth to remove the grinding burr.
chisel flat on a bench stone and move it back and forth to
remove the grinding burr from the outside (Figure
24-51). Count the strokes and hone each side of the chisel
an equal amount.
the burr from the inside of the chisel, handhold the cone-shaped
stone straight in the end of the chisel and rotate the chisel
back and forth several times (Figure
24-52. Use the cone-shaped grinding stone to remove
the internal burr.
the honing on the bench stone with progressively finer stones
along with the internal honing with the cone-shaped stones
until the tips and edges are razor sharp.
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