Adjustments; Removing And Installing Blade; Blade Tension - Jet HBS-1220DC Operating Instructions And Parts Manual

12”x20” dual column band saw
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5.
On the transformer, change the wire position
from 230V to 460V.
6.
Replace the 230V overload relay for main
motor, with the 460V overload relay for main
motor. (Note: additional purchase, see parts list
for number to order.) Set new relay to 4.5A.
7.
Replace the 230V overload relay for oil pump,
with the 460V overload relay for oil pump.
(Note: additional purchase, see parts list for
number to order.) Set new relay to 1.4A.
8.
Replace the 1A fuse on the primary side with a
0.5A fuse. (Note: additional purchase, see parts
list for number to order.)
9.
Voltage conversion is now complete.
Figure 6-1: main motor wiring
Figure 6-2: oil pump wiring
Figure 6-3: coolant pump wiring

7.0 Adjustments

Disconnect saw from power
source before making adjustments, unless
indicated otherwise.

7.1 Removing and installing blade

When your machine was shipped, a new blade was
supplied and assembled to the saw. When
replacement becomes necessary:
1.
Raise bow enough for blade to clear table slot.
Close the feed rate dial by turning it
counterclockwise as far as it will go.
2.
Press E-stop button and disconnect machine
from power source.
3.
Remove knobs and open blade wheel covers.
4.
Remove red blade guards.
5.
Release blade tension by turning tension
handle (Figure 7-1) counterclockwise.
6.
Remove blade from both wheels and out of
each blade guide assembly. CAUTION: Even
dull blades are sharp to the skin. Wear
leather work gloves when handling blades.
7.
Clean the swarf out of the blade wheel area.
8.
Make sure teeth of new blade are pointing in
proper direction of travel.
9.
Position new blade on the wheels. Make sure
back of blade is against shoulder of both
wheels.
10. Twist the blade and slip it into the blade guide
assemblies NOTE: If roller bearings need
adjusting, refer to sect. 7.6.
11. When you are sure that back of blade is against
shoulder of both wheels and properly inserted
into guides, tension the blade.
12. Connect power and jog blade on/off button to
be sure blade is in place and tracking properly.
If blade is not tracking properly refer to sect. 7.3.
13. Adjust wire brush so that it contacts the blade.
14. Install all guards and close covers.

7.2 Blade tension

Blade tension has been preset by the manufacturer
for the installed blade at 18,000-20,000 psi (1200-
1400 kg/cm
2
); if further adjustment is required, or
after installing a new blade, turn handwheel (Figure
7-1) clockwise to appropriate tension for the
installed blade.
8

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