Porter-Cable PCB420SA, Instruction Manual

14

OPERATION

The belt/disc sander is designed to perform sanding 
operations on surface, and edge grain. The sander 
will also perform freehand forming and contouring 
operations. The following suggestions are recommended 
for best results and safest use.
1.  Always apply light pressure allowing the abrasive to 

remove the material slowly.

2.  The workpiece should be moved, continuously, to 

avoid burning.

3.  Avoid sanding small pieces of wood which will posi-

tion the fingers close to the abrasive belt or disc.

ON/OFF SWITCH (FIG. L)

To avoid injury, always keep the plug disconnected 

from the power source and the switch turned OFF 

until the sander is completely assembled and 

adjusted properly.

The ON/OFF power switch is located on the front of the 
sander, and incorporates a removable safety switch (1).
1.  To turn the machine “ON”, move the switch up to the 

“ON” position.

2.  To turn the machine “OFF”, move the switch down to 

the “OFF” position.

In situations where the sander may be left unattended, 
the operator has the option of removing the “black” 
safety portion of the ON/OFF switch to render the 
sander inoperable. When the operator is ready to use 
the machine again, the “black” safety portion of the 
switch may be reinstalled simply by inserting it into the 
opening in the switch and pushing it in until it “seats.”

Fig. L

CAUTION

!

WARNING

!

ON

OFF

REMOVE

TO LOCK

1

BELT HORIZONTAL SANDING (FIG. M)

To avoid trapping the workpiece or fingers between 

the worktable and sanding belt, the worktable 

edge should be positioned a maximum of 1/16 in.          

(1.6 mm) from sanding belt.

When using the sanding belt in the horizontal position, 
to perform surface or edge sanding, the belt worktable 
(1) must always be used. Always hold the workpiece 
(2) firmly keeping your fingers away from the sanding 
belt . Always keep the end of the workpiece against the 
belt worktable (1) and move the work evenly across the 
sanding belt. Apply only enough pressure to allow the 
sanding belt to remove material. Use extra caution when 
sanding very thin pieces.

Fig. M

SANDING INSIDE CURVES (FIG. N)

To avoid injury, do not apply the end of the 

workpiece to the idler drum (1). This could cause the 

workpiece to fly up or cause kickback.

With care, freehand sanding of inside curves can be 
accomplished on the idler drum (1). Never attempt to 
sand the ends of a workpiece on the idler drum (1).

Fig. N

CAUTION

!

1 2

3

CAUTION

!

1