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ADJUSTING THE HOLD-DOWN
The hold-down (C) Fig. 23 prevents the workpiece (E)
from lifting as the chisel rises out of the hole. To adjust
the hold-down, loosen the handle (F), position the hold-
down so that it just touches the top of the workpiece (E),
then tighten the handle. You can turn the hold-down (C)
upside down to accommodate thicker workpieces.
ADJUSTING THE CHISEL PARALLEL TO THE WORKPIECE
You can adjust the chisel (A) Fig. 24 parallel to the workpiece by loosening the screw (B) and rotating the chisel until
the back surface of the chisel is touching the workpiece. Tighten the screw (B).
ADJUSTING THE SLIDING FIT BETWEEN THE HEAD AND THE COLUMN
A dovetail gib (A) Fig. 25 ensures a good sliding fit between the head and the column. Make the adjustment by
loosening the two screws (B) and turning the adjusting screws (C). Tighten the two screws (B).
NOTE: The adjustment is correct when no side movement between the gib and the column is evident. Adjust the gib
so that is is not so tight as to restrict the sliding movement or so loose that it affects accuracy.
A
1.
Keep chisels and bits sharp.
2.
A typical mortis operation is illustrated in Fig. 26. Note
that the opening (A) in the chisel is to the right. Move your
workpiece from left to right for subsequent cuts to allow
chips to escape freely.
3. Hold the workpiece firmly against the fence. Ensure that
the hold-down (B) Fig. 28 is properly adjusted. The rate of
penetration of the chisel must be fast enough to prevent
burning at the tip of the bit, but not too fast as to stall
the motor. You may encounter smoke from the bit or the
workpiece. Smoke is a natural operating occurrence, caused by friction and burning of resins. Bluing of the chisel
after initial use is not indicative of a dull chisel, but rather is a combination of friction and built-up resin on the
cutting face of the chisel. You can detect a dull chisel by the amount of excess force required to complete a cut.
4. When performing a through mortise, place a thin piece of wood between the workpiece and the table to prevent
"chip-out" at the bottom of the mortise.
B
Fig. 24
11 - English
C
E
C
A
B
F
Fig. 23
B
Fig. 25
A
Fig. 26
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