Delta 14-650 Instruction Manual download pdf (Page 14)

Fig. 32

ADJUSTING SLIDING

FIT BETWEEN HEAD

AND COLUMN

A dovetail gib (A) Fig. 32, is provided on the rear of the

head to insure a good sliding fit between the head and

the column when the head is raised and lowered.

Adjustment is made by loosening the two screws (B) and

turning adjusting screws (C). Then tighten two screws

(B). NOTE: Correct adjustment is when a good snug

sliding fit is obtained without any side movement

between the gib and the column. This adjustment

should not be too tight that it restricts the sliding

movement or too loose that it affects accuracy.

OPERATION

Fig. 33

Fig. 34

1. Make sure that chisels and bits are sharp.

2. Fig. 33, illustrates a typical mortising operation.

Note that the opening (A) in the chisel is to the right. This

means that after the first incision is cut, the workpiece

should be moved to the right for subsequent cuts. This

allows chips to escape freely through the opening in the

chisel.

3. Make sure the workpiece is held firmly against the

fence when cutting and that the holddown (B) Fig. 33, 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 en-

counter smoke from the bit or material once the chisel has

engaged the material. The smoke created is a natural

operating occurrence in hollow chisel mortising and is

caused by material chip friction and the resins in the

stock being burned off. Bluing of the chisel after initial

use is not indicative of a dull chisel, but a combination

of friction and resin buildup on the cutting faces 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, a thin piece of

wood should be placed between the workpiece and the

table. This prevents “chip-out” at the bottom of the

mortise and also prevents damage to the table.

5. Fig. 34, illustrates the mortising operation

completed.

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Delta 14-650 Instruction Manual Page 14

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