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19
3. When the saw has completed 1/3 of the cut,
increase the feed rate slightly and allow the
saw to complete the cut.
4. Keep the same hydraulic cylinder setting and
begin a second cut on the same or similar
workpiece.
5. When the blade has completed about 1/3 of
the cut, increase feed rate. Watch the chip
formation until cutting is at its most efficient
rate and allow the saw to complete the cut
(see section 11.4, Evaluating cutting
efficiency).
6. The blade is now ready for regular service.
11.3 General operating procedure
1. Raise bow until it will clear workpiece by a few
inches, and close hydraulic cylinder valve to
secure it in place.
NOTE: Never start a cut with blade
contacting workpiece.
2. Place workpiece in vise and tighten vise. The
workpiece should be fitted directly between the
jaws without adding other objects.
When workpiece to be cut is a profiled section,
flat piece or special shape, refer to examples
in Figure 30 for proper clamping positions. The
top row shows acceptable clamping positions;
the bottom row shows unacceptable positions.
If thickness of profiled 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.
Figure 30
Never hold a workpiece by
hand when cutting it – the workpiece should be
firmly secured in the vise. Do not reach into the
cutting area during cutting operations.
3. Position work stop if needed.
4. Position blade guides as close to workpiece as
possible.
5. Move speed setting handle to desired position.
Do not move speed setting handle during a
cutting operation.
6. Set a suitable downfeed rate for that operation
on the hydraulic cylinder dial.
7. Push start button to begin blade rotation. Allow
blade to reach full speed before beginning cut.
8. Turn on coolant flow. Adjust flow valves as
needed.
9. Open valve on hydraulic cylinder to allow bow
to descend in a gradual and controlled
manner.
10. The machine will shut off at the completion of
the cut. Turn off coolant flow and remove
workpiece.
11. Return bow to raised position for next cut.
11.4 Evaluating cutting efficiency
Is the blade cutting efficiently? The best way to
determine this is to observe the chips formed by
the cutting blade.
If chip formation is powdery, then the feed rate is
much too light, or the blade is dull.
If chips formed are curled, but colored — that is,
either blue or straw-colored from heat generated
during the cut — then the feed rate is too high.
If chips are slightly curled and are not colored by
heat – the blade is sufficiently sharp and is cutting
at its most efficient rate.
12.0 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.
Keep all surfaces clean and free of rust, slag,
chips, and coolant build-up.
Clear metal particles with a small paint brush or
parts cleaning brush.
Clean filter screen.
Do not use compressed air, as it may force chips
into the guide bearings and other critical areas of
the saw.
Wipe saw down with a clean, dry cloth, and oil all
unpainted surfaces with light machine oil.
Keep blade guides clean and free of metal
particles.
Check guide bearings frequently to make sure that
they are properly adjusted and turning freely.
If the power cord is worn, cut, or damaged in any
way, have it replaced immediately.
Ball bearings on blade guide assemblies and blade
wheels are permanently lubricated and sealed.
They require no further lubrication.
Grease the vise lead screw (Figure 31) as needed,
with a general purpose grease.
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