Powermatic 720HD operating instructions Operation, Maintenance

Operation

General operating procedure:

1.Position workpiece on table and secure with clamp.

2.Set depth stop.

3.For lateral cuts, adjust positive stops according to length of cut.

4.Position head front-to-back and laterally for the first cut. If making a lateral cut, make sure the Y-axis locking handle is tightened.

5.Turn on the machine and feed the chisel and bit steadily into the workpiece.

IMPORTANT: The rate of feed must be fast enough to prevent burning at the tip of the bit, but not so fast as to cause the machine to slow or stall. The different rates of feed for different woods must be learned by experience.

6.After the first cut, the head is moved using one of the handles for each successive cut. The direction of movement must allow the chips to clear freely. Move the workpiece so that the slot in the chisel is releasing chips into the already-cut part of the workpiece (Figure 21).

Do not have the chisel slot against the blind end of the mortise, as the chips will not be able to clear the chisel. This can cause overheating and possible breakage of chisel or bit.

When cutting deep mortises, make the cut in several stages of approximately 1” each, to allow chips to clear. When cutting through- mortises, to prevent breakout at the back of the workpiece and damage to the work table, use a piece of scrap material under the workpiece as support.

Maintenance

Before doing maintenance on the mortiser, disconnect it from the electrical supply by pulling out the plug or switching off the main switch. Failure to comply may cause serious injury.

The Mortiser requires only minor maintenance, such as cleaning and lubrication and routine adjustment and sharpening of the chisel and bit.

Wipe down the Mortiser after each use and, as necessary, use light applications of oil or grease to lubricate linkages, moving parts, etc.

If the power cord is worn, cut, or damaged in any way, have it replaced immediately.

Figure 21

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