On/Off Switch; Operating Controls; Operation; Pre-Operation Inspection - Jet HBS-812G Operating Instructions And Parts Manual

9.13 On/off switch

The stop screw (A, Figure 27)
must be properly
damage to the on/off switch.
Make sure the stop screw (A, Figure 27) is
properly adjusted in conjunction with the shut-off
tab (B, Figure 27). Too much pressure from the
shut-off tab can damage the on/off switch.
Figure 27

10.0 Operating controls

To start saw, toggle switch (C, Figure 27) to ON.
To stop saw before it reaches the end of cut,
toggle switch (C) to OFF. Otherwise, saw will
automatically stop at the end of a cut.
Toggle the coolant switch (D, Figure 28) to ON.
Flow of coolant to blade area is controlled by the
taps connected to the blade guide assemblies.
Figure 28
IMPORTANT: When cutting magnesium, never
use soluble oils or emulsions (oil-water mix) as
water will greatly intensify any accidental
magnesium chip fire. See your industrial coolant
supplier for specific coolant recommendations
when cutting magnesium.
adjusted to prevent

11.0 Operation

11.1 Pre-Operation inspection

Give machine an overall inspection and verify
the following:
1. Guards and covers are in place and in
working order.
2. Blade tooth direction matches diagram on
bow.
3. Blade is properly tensioned, and tracking
correctly on wheels.
4. Side and rear blade guide bearings are
properly adjusted.
5. Coolant level is sufficient.
6. Gearbox is properly lubricated.
7. Do not begin cut on a sharp edge; file edge
first.

11.2 Blade break-in procedure

New blades are very sharp and, therefore, have
a tooth geometry which is easily damaged if a
careful break-in procedure is not followed.
Consult the blade manufacturer's literature for
break-in of specific blades on specific materials.
However, the following procedure will be
adequate for break-in of JET-supplied blades on
lower alloy ferrous materials.
1. Clamp a round section workpiece in the
vise. The workpiece should be 2 inches or
larger in diameter.
2. Set the saw on low speed. Start the cut with
a very light feed rate.
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
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.
18
11.4, Evaluating cutting