Emergency Stop; Switch Safety Key; Setting Depth Of Cut; Establishing Drum Height - Powermatic PM2244 Manual De Instrucciones De Operación Y Piezas

When handwheel is rotated to move drum
downward below zero point, a negative sign will
appear before the depth number (K).
NOTE: Drum height will remain in control panel
memory if E-stop button is pressed. Drum height will
not remain in memory if main power switch is turned
OFF.

8.8 Emergency stop

Press E-stop button (D, Figure 16) to shut down all
machine operations. When E-stop is pressed, drum
motor stops and "ON" (J) goes dark on display.
Conveyor motor also stops, and racetrack (G)
flashes.
IMPORTANT: The E-stop remains engaged until it
is rotated clockwise for release. Also, the conveyor
speed dial (C, Figure 16) must be returned to OFF
position before restarting machine.
The E-stop is designed for emergency shut-off.
Under normal circumstances, use the other
switches on the control panel to turn off machine
functions.

8.9 Switch safety key

To prevent unauthorized use of sander, turn off main
switch and pull out safety key (Figure 17). Store key
in a safe place. Key must be reinserted to start
sander.
Figure 17

8.10 Setting depth of cut

Adjusting the drum sander for proper contact
between abrasive and stock determines the depth
of cut. The depth of cut is controlled by the height
adjustment handwheel.
It may take some experimentation to determine the
proper depth of cut, given the variables of abrasive
grit, type of wood, and feed rate. For best results,
use scrap wood to practice sanding and to develop
skill and familiarity with the machine before doing
finish work.
A combination of several variables will determine
proper depth of cut to use, including the following:
1. Abrasive type and grit size.
2. Width of piece being processed.
3. Hardness of piece.
4. Feed rate of conveyor belt.

8.11 Establishing drum height

A good rule of thumb when sanding with grits finer
than 80 is to place the stock to be sanded under the
drum and lower drum until it contacts the stock.
Drum should still rotate by hand. Without changing
drum height, finish feeding the stock under the
sander.
Start sanding drum and sand the stock at that same
position.
contact with stock.
For sanding with grits coarser than 80, you can
lower the drum slightly.
Always maintain control of stock. Through practice
you will learn the proper depth of cut considering the
variables above.

8.12 Selecting conveyor rate

A faster feed rate allows faster sanding but fewer
revolutions of the drum per inch of sanding. A slower
feed rate provides more revolutions of the drum per
inch of sanding to allow a greater depth of cut and
smooth sanding.
Begin experimenting with feed rate set to about 40%
to 50% of maximum. The best feed rate will depend
on a number of factors, including type of stock, grit
and depth of cut used, and whether the stock is fed
directly in line with the conveyor bed or at an angle.
If the drum motor is lugging down, if the conveyor
belt is slipping, or if you observe a ripple effect on
the stock, slow the feed rate. If the finish is smooth
and the machine is not overworking, you can
experiment using a faster feed rate.
The Feed Logic control continuously monitors the
load on the drum motor, and automatically regulates
the speed of the conveyor motor to maintain highest
feed rate without overload. When "Feed Logic"
flashes and "ON" illuminates on the display (I, Figure
16), the Feed Logic control has detected too great a
depth of cut and/or too fast a feed rate.
If load on the drum motor increases, Feed Logic will
decrease the conveyor feed rate and will stop the
conveyor under extreme conditions. If load on the
drum motor decreases, Feed Logic will increase the
feed rate but will not increase it faster than the
speed the user has preset on the dial.
The best and most consistent finish will be achieved
if the conveyor does not change speed during
operation. A change in conveyor speed may affect
the finish surface. If the finish is affected, make
another sanding pass without changing any
settings.
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Do not start drum while in