Adjusting Depth Stop For Tapping (Ghd-20Pft); Changing Spindle Speeds; Return Spring Adjustment - Jet GHD-20 Operator's Manual

Adjusting the Depth Stop for Tapping (GHD-
20PFT)
1. Loosen the depth stop lock handle (A, Fig. 12)
so it does not interfere with the internal depth
stop located on the front of the drill head.
2. Adjust the front depth stop for the proper depth.
3. Manually advance the quill releasing the upper
limit switch for tapping. This will start the motor.
The quill will reverse directions upon triggering
the lower limit switch.
4. Do not powerfeed and tap at the same time.
Changing Spindle Speeds
To change spindle speeds:
1. Stop the drill by turning the low/stop/high switch
to stop.
2. Adjust the levers (A, Fig. 13) to the desired
speed as indicated by the speed chart. Turning
the spindle by hand will help the gear teeth
mesh.
Return Spring Adjustment
The return spring is adjusted at the factory and
should not need further adjustment. If adjustment is
necessary:
1. Unplug the machine from the power source.
2. Loosen lock knob (A, Fig. 14) while holding the
quill spring cover. Do not allow the cover to turn
in your hand or the spring will unwind.
3. Pull out the cover (8, Fig. 14) and rotate until
the pin (C, Fig. 14) on the return spring plate
engages the next notch in the coil spring cover.
Turn the cover clockwise to decrease tension
and counter-clockwise to increase tension.
4. Tighten the lock knob (A, Fig. 14). Do not over-
tighten. Nuts should not contact the housing
when tight.
Fig. 14
11