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2.
Position workpiece in vise and tighten vise.
Workpiece should be fitted directly between
jaws without adding other objects. When
workpiece is profiled section, flat piece or
special shape, refer to examples in Figure 8-1
for proper clamping positions. The top row
shows acceptable clamping positions, the
bottom row shows unacceptable positions.
If the thickness of profile section is very thin, a
piece which duplicates the profile should be
fitted inside the workpiece itself, to prevent
workpiece being crushed between the jaws.
Do not load/unload material
from vise while machine is running. Never hold
workpiece by hand when cutting; workpiece
must be firmly secured in vise. Do not reach into
cutting area during cutting operations.
Figure 8-1: clamping positions
3.
Adjust blade guides to minimize exposed blade
area.
4.
Release prop and turn on saw. Lower bow until
blade contacts material. Release bow to allow
cutting to proceed. Weight of bow in conjunction
with spring tension will force blade through
material until cut is finished.
5.
Limit switch must turn off saw at completion of
cut. Adjust if needed.
8.4 Evaluating cutting efficiency
Is the blade cutting efficiently? The best way to
determine this is to observe the chips formed by the
cutting. The ideal chip is thin, curled, silvery, and
warm to the touch. This indicates blade is operating
at efficient speed and downfeed rate.
If chip formation is powdery, then feed pressure is
much too light, or blade is dull.
If chips are curled, but are heavy, or colored golden
brown to blue, then excess heat is being produced.
Feed pressure is too great or blade speed is too
high.
9.0 User-maintenance
Before doing maintenance on
the machine, disconnect it from the electrical
supply by pulling out the plug or switching off
the main switch. Failure to comply may cause
serious injury.
9.1 General maintenance
Wipe down saw with a soft rag after each use, and
clear metal particles with a small paint brush or parts
cleaning brush. Do not use compressed air, as it
may force chips into guide bearings and other
critical areas of saw.
Periodically apply a light coat of oil, such as SAE30,
on exposed metal surfaces to inhibit rust.
Make frequent inspections of motor fan, and blow
out (with low pressure air hose) or vacuum any
accumulation of foreign material to maintain normal
motor ventilation.
Keep blade guides clean and free of metal particles.
Check guide bearings frequently to make sure that
they are properly adjusted and turning freely.
Inspect power cord; if worn, cut or damaged in any
way, have it replaced immediately.
9.2 Commutator brush inspection
To maintain motor efficiency, inspect the two carbon
brushes every two months, or more frequently if saw
is heavily used. Stalling or loss of power may be a
symptom of worn carbon brushes. If one brush is
worn out, replace both at the same time.
Continued use of a damaged or
worn brush may result in damage to motor
armature.
1.
Unplug saw from power source.
2.
Remove four button head screws, and remove
motor sleeve.
3.
Unscrew and remove cap with flat blade
screwdriver. See Figure 9-1.
4.
Gently pry up an edge of the brass clip, until the
spring causes it to disengage from hole. (Notice
orientation of brush as you remove it; it should
be inserted in the same manner; curvature of
brush will match curvature of motor.)
5.
Pull out brush and inspect. Brush should be
replaced if any of the following are discovered:
•
Brush has worn to about 1/2-inch long.
•
Signs of crumbling, burning, breaking.
•
End of brush is rough or pitted.
•
Abnormal coloration of spring
•
Broken lead in spring
•
Collapsed spring
16
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