Delta 17-925 User Manual download pdf (Page 6)

SPINDLE SPEEDS

The correct spindle speed depends on the size of the bit and the hardness of the wood. Your best cuts are generally

in the range of 650 to 1800 RPM. Use a slower speed for larger bits and harder woods and faster speeds for smaller

bits and softer woods.

MORTISING CHISEL AND BIT COMBINATIONS

OPERATION

Place the workpiece on the table and adjust the height of the table so that

the point of the chisel clears the work about 1/2". Lower the chisel along

the side of the workpiece to gauge the depth of the mortise. Adjust the

depth stop of the drill press to control the depth of the mortise. Adjust the

guides (X) Fig 21 to hold the work against the fence (Y), tilting them if nec-

essary. Lower the hold-down (Z) against the top of the work. This hold-

down should hold the work in place, but should also allow the workpiece

to slide to its next position. These hold-down arms are independently

adjustable. Once you have them adjusted, tighten the thumb screws (T).

Loosen the locking levers (S) Fig. 21 that hold the mortising attachment

fence to the drill press table. Shift the fence forward or toward the column

to being the workpiece to the desired position under the mortising chisel.

Tighten the locking levers.

Slide the workpiece along the fence to ensure that the cuts will be aligned. Loosen the lock handle (Y) Fig. 21 and turn

the chisel in the holder (if necessary) to make its faces square with the cut. Tighten the lock handle (Y).

NOTE: If the fence and face of the chisel are not parallel, the cuts will be staggered.

NOTE: Make mortise cuts to the far left and far right first, then make the cuts in between. This method allows all four

sides of the chisel to make a true vertical cut on each end.

NOTE: Do not attempt to mortise deeper than maximum depth listed for each chisel as indicated in Fig. 22. Going

past these limits will clog the ejection slots and you will damage the tool or the bit.

NOTE: Practice on scrap material before you use an actual workpiece.

NOTE: For through mortises, place a piece of 1/2" plywood between the workpiece and the drill press table to

eliminate splintering.

MORTISING CHISELS

WITH 5/8" X 1-1/2" SHANK

Size

Depth Capacity

1/4" x 1/4"

5/16" x 5/16"

3/8" x 3/8"

1/2" x 1/2"

1-7/8"

SHARPENING CHISELS AND MORTISING BITS

Sharpening these chisels requires considerable skill and practice. An improperly-sharpened hollow chisel can easily

split in operation, and an old bit will cause excessive strain on the hollow chisel, causing breakage. Therefore, we

recommend that you find an expert rather than doing the job yourself.

T S

Fig. 20

Fig. 21

Fig. 22

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Delta 17-925 User Manual Page 6

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