Jet JDP-20VS-3, Operating Instructions And Parts Manual

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3. Set depth block to zero by turning knurled knob
(E
1
). Then adjust block to desired depth of hole,
and secure setting with knob (E
2
).
4. Start motor and drill hole until travel is
restrained by indicator block.
8.1.2 For tapping (JDP-20VST only)
1. Set depth stop in same manner as above.
2. Set tapping mode (H).
3. When quill is advanced using downfeed handle
(D), upper limit switch will be released for
tapping. When lower limit switch is triggered,
spindle will reverse rotation direction. When
spindle is returned to highest position, it will
resume forward rotation.
NOTE: When tapping mode is off, limit switches are
deactivated and do not affect spindle rotation.
8.2 Table adjustment
The table can be raised or lowered to accommodate
workpiece height. Place hand crank on shaft (A,
Figure 8-1) and turn counterclockwise to loosen
table lock. Then use hand crank on shaft B or C to
raise or lower table. Lock table in position using
shaft A.
If drill press base is to be used for securing
workpiece, loosen table (A) and swing it around
column and out of the way. Retighten table.
Figure 8-1: table adjustments
8.3 Tool installation and removal
1. Disconnect machine from power source.
2. Thoroughly clean inside of spindle with a soft
dry cloth. Also clean any taper or arbor to be
used in the spindle. If these are not kept clean,
taper or arbor will not “seat” properly in spindle
and may drop out unexpectedly.
3. Place protective piece of scrap wood on table.
4. Raise table to approximately 8-to-10 inches
below spindle.
5. Insert MT-4 tool into spindle.
6. Lower spindle using downfeed handle, and seat
tool against the wood.
7. If installing a drill chuck, retract the jaws then
use rubber mallet (or steel face hammer against
a block of wood) to sharply tap bottom of chuck
two or three times to seat it. NOTE: Never use
a steel face hammer directly against the chuck.
To remove a tool:
1. Disconnect machine from power source.
2. Lower spindle to expose slots in spindle wall.
3. Insert drift key into spindle slots and tap gently
until drill bit or chuck arbor loosens. Hold tool
with one hand (use glove or rag if needed) while
tapping to prevent tool from falling and being
damaged.
8.4 Speed pickup adjustment
Speed pickup has been set correctly by the
manufacturer. If the speed readout display should
lose accuracy, adjustment can be made as follows.
Refer to index numbers on exploded view,
sect.
13.3.1.
1. Loosen screws securing speed pickup (ref. #50)
to plate (#51).
2. Adjust speed pickup gap to approximately 1/8-
inch. Retighten screws.
3. Operate drill press to verify that speed readout
is operating correctly.
8.5 Spindle return spring adjustment
The spindle return is preset by the manufacturer and
should not need adjustment. If future attention is
ever required, proceed as follows:
1. Do NOT remove spring cap (D, Figure 8-2).
2. Loosen knob (E) just enough to rotate spring
cap past notch (F).
3. Rotate spring cap clockwise to decrease spring
tension. Rotate spring cap counter-clockwise to
increase spring tension.
4. Re-tighten knob (E).
Figure 8-2: return spring adjustment