Delta 14-651 Instruction Manual download pdf (Page 12)

HOLD-DOWN

The hold-down (C) Fig. 25 prevents the workpiece (E)

from lifting as the chisel is lifted 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.

Fig. 25

CHISEL PARALLEL TO WORKPIECE

The chisel (A) Fig. 26 can be adjusted 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).

SLIDING FIT BETWEEN HEAD AND COLUMN

A dovetail gib (A) Fig. 27 ensures a good sliding fit between the head and the column when the head is raised and

lowered. 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.

OPERATIONS

1. Keep chisels and bits sharp.

2. Fig. 28 illustrates a typical mortising operation. 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. The smoke created is a natural operating occurrence, caused by friction and the 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. A dull chisel can be detected 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.

Fig. 26

Fig. 27

Fig. 28

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Delta 14-651 Instruction Manual Page 12