Centers: Installing/Removing; Comparator - Powermatic 3520C Manuel D'instructions D'utilisation

4. Screw index pin (G) into headstock to lock
spindle.
5. Cut first flute in workpiece.
6. Push index position button (F) to set engaged
index position at zero.
7. Unscrew index pin (G) to release spindle, then
rotate workpiece until next desired hole shows
on readout.
8. Engage index pin, and rout second flute.
Continue process.
Example: If 6 evenly-spaced flutes are needed
around full workpiece circumference, use positions
0, 8, 16, 24, 32, and 40.
IMPORTANT: When finished indexing, unscrew
and release index pin before turning spindle on!
Readout will revert to RPM setting when lathe
spindle is turned on.
Figure 8-4

8.7 Centers: installing/removing

8.7.1 Headstock center
1. Disconnect Lathe from power source.
2. To install a spur center or live center (the spur
center should first be mounted to your
workpiece; see sect. 10.3 for more details),
clean tapered end of center and inside of
headstock spindle, then push center into
headstock spindle.
3. To remove a spur center or live center, first
remove workpiece from Lathe. Insert knockout
rod (Figure 8-5) through hole in handwheel and
firmly tap tapered end of spur center. The
sliding collar on the knockout rod helps give the
necessary impact without having to use a mallet
against the end of the rod.
IMPORTANT: Hold the center by either placing
thumb and forefinger on outside diameter of
spur center, or wrapping the center with a rag.
The center can be damaged if allowed to fall.
Figure 8-5: center removal
8.7.2 Tailstock center
1. Install center into tailstock by pushing it into
tailstock spindle.
2. To remove a center, loosen locking handle (B,
Figure 8-1) and retract quill by rotating
handwheel counterclockwise
dislodges on its own. Do not allow center to fall
out of spindle, as it may get damaged.

8.8 Comparator

The spindle comparator consists of two comparator
centers inserted into the brackets at rear of lathe.
The comparator is used to mount a finished, or
"reference" spindle, from which measurements can
be taken, the measurements being transferred to
the new piece being turned.
A spindle guard cannot be
installed when using spindle comparator. Use
caution and wear a face mask when turning
without guard installed.
1. Install comparator spur center into guard
bracket, by lifting up on plunger and inserting
comparator spur center until its point is about
even with point of spur center in headstock
spindle. See Figure 8-6. The plunger in the
bracket must engage one of the holes in the
comparator center at this position.
Figure 8-6: comparator
2. Install comparator dead center in the tailstock
bracket and tighten locking handle. See Figure
8-7.
13
until center