Milwaukee 1670-1 manual Bracing for reverse rotation, Shifting Speeds Fig, Reversing Fig, Drilling

Bracing for reverse rotation

Fig. 6

C

B

A

Fig. 7

D

B

A

When drilling in reverse, the bit will rotate in a counterclockwise direc- tion. If the bit binds in the hole, the bit will come to a sudden stop and the drill will suddenly react in a clockwise direction.

Figures 6 and 7 show examples of the Hole Hawg® properly braced for reverse rotation.

A.Reverse (counterclockwise) rotation

B.Reaction

C.Brace drill with pipe handle here

D.Brace drill with motor housing here

If the bit binds, the pipe handle or the motor housing braced against the stud will hold the drill in position.

Shifting Speeds (Fig. 8)

Cat. No. 1675-1 has a gear shift lever on the right Fig. 8 side of the gear case.

The high setting (1200 RPM HI) is the low torque setting and is designed for driving Selfeed bits 1-3/8" in diameter and smaller.

The low setting (300 RPM LO) is the high torque setting and is designed for driving Selfeed bits 1-1/2" in diameter and larger.

Always turn off the switch and shift while the tool is coasting to a stop. Never shift the drill while it is moving at full speed, when it is under load, or when it is stopped.

Reversing (Fig. 9)

Fig. 9

A reversing switch is located below the trigger switch for removal of bits from holes. Permit the motor to come to a complete stop before reversing. Reversing the tool with the gears in motion may cause severe damage. When removing selfeed bits from partially drilled holes, a flick of the trigger switch will free the threaded pilot screw. When the threads are loose, lift the bit from the workpiece with the motor stopped.

Drilling

Before drilling, clamp down the material securely. A poorly secured piece of material may result in personal injury or inaccurate drilling. When drilling in light gauge metal or wood, use a wooden block to back up the material to prevent damage to the workpiece.

Mark the center of the hole to be drilled with a center punch to give the bit a start and to prevent it from "walking." Lubricate the drill bit with cutting oil when drilling iron or steel. Use a coolant when drilling nonferrous metals such as copper, brass or aluminum.

To start a selfeed bit, run the threaded feed screw into the work by flicking the trigger switch, permitting the bit to coast until the teeth con- tact the work surface. Align the bit properly before proceeding. This will reduce cocking and jamming when starting. To reduce jamming on break- through, decrease the drilling pressure when the feed screw point breaks through the workpiece. Proceed with steady, even pressure.

WARNING!

To reduce the risk of injury, always wear eye protection.

Chuck Removal (Fig. 7)

This tool is equipped with a threaded spindle to hold the chuck. Before removing the chuck, unplug the tool and open the chuck jaws. A left- handed thread screw is located inside the chuck to prevent the chuck from loosening when the tool is operated in reverse direction. Remove the screw by turning it clockwise. To remove the chuck, hold the tool so that only the side of the chuck rests firmly and squarely on a solid workbench. Insert the chuck key or a chuck remover bar in one of the keyholes. Turn the chuck so the key is at about a 30° angle to the bench

top and strike the key sharply with a hammer so the Fig. 7

chuck turns in a counter- clockwise direction (looking from the front of the tool). This should loosen the chuck from the spindle which has a right hand thread making it easy to remove the chuck by hand.

NOTE: When replacing the chuck, always replace the left hand thread screw in the chuck.

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