To Change BIT Holder Models 6640 | Porter-Cable 6642, 902387, 6641

902387 - 10-31-01.qxd 2/12/02 3:30 PM Page 8

TO CHANGE BIT HOLDER – MODELS 6640, 6645

1.CAUTION: DISCONNECT TOOL FROM POWER SOURCE.

2.Twist and pull the aluminum nosepiece (A), Fig. 4, out of the depth stop assembly.

3.Pull bit holder (B), Fig. 4, straight out. If it is difficult to remove, grip with pliers and pull. NOTE: Bit (C), Fig. 4, may be removed from bit holder by pulling straight out.

4.Push new bit holder into spindle until it snaps into place.

5.Install aluminum nose piece and adjust depth stop (see TO ADJUST DEPTH STOP, MODELS 6640, 6645).

TO ADJUST DEPTH STOP – MODELS 6640, 6645

1.Pull the adjusting collar (D), Fig. 4, forward, (away from power unit), and hold while performing Step 2.

2.Turn depth stop until end of bit extends 3/32" beyond end of depth stop. Do not push in nutsetter as this will engage internal drive.

3.Release adjusting collar being sure that the depressions in the collar engage the projections on the clutch housing.

4.Drive a test fastener in a piece of scrap material identical to that to be used. Examine results of drive and make additional depth stop adjustment if required as follows:

a)To increase depth of drive, repeat STEP 1 and turn depth stop so that end of bit extends further from end of depth stop.

b)To decrease depth of drive, repeat STEP 1 and turn depth stop so that end of bit is closer to end of depth stop. Each 1/8 turn of the adjusting collar results in .010" change in depth of drive.

5.Repeat STEPS 3 and 4 until desired result is obtained.

DRIVING DRYWALL SCREWS – MODELS 6640, 6645

1.Install drywall bit and bit holder to screwdriver.

2.Set screwdriver for correct rotation.

3.Start screwdriver and place drywall screw on bit.

CAUTION: DO NOT EXERT PRESSURE ON SCREW WHILE DOING THIS.

4.Place end of screw in desired location and remove fingers.

5.Apply forward pressure to drive screw until depth stop rests on the surface of the work. The depth stop should be adjusted so that the fastener head is sunk just below the surface of the wallboard.

DRIVING SELF-DRILLING/TAPPING SCREWS – MODELS 6640, 6645

These screws drill and tap their own hole as they are driven. This differs from self-tapping screws in that pre-drilled holes for tapping are not required. Drive these screws as follows:

1.Install proper nutsetter that fits screw to screwdriver.

2.Set screwdriver for correct rotation.

3.Start screwdriver and insert head of screw in nutsetter.