Jet VBS-18MWEVS, Operating Instructions And Parts Manual

Page: 15 / 52

15
7.9 Blade tracking
Refer to Figures 7-12 and 7-13.
After proper tensioning, the blade must be tracked.
“Tracking” refers to position of blade on the wheels
while machine is in operation. Tracking should be
checked periodically and is mandatory after every
blade change. Blade tracking is done by hand with
machine disconnected from power.
1. Disconnect machine from power source.
2. Blade must be correctly tensioned (sect. 7.7).
3. Make sure blade guides and other parts of
machine will not interfere with blade movement.
Use handwheel (N) to lower guide post until you
can see blade through tracking window (O,
Figure 7-12).
4. Set blade tension lever initially to Partial
Tension-Idle/Tracking
position.
Figure 7-12
5. Open upper door to expose wheel.
6. Rotate wheel by hand, observing position of
blade through tracking window. As you rotate
wheel, move tension lever to Full Tension
position. The blade should continue to ride upon
center of tire (Figure 7-13).
Figure 7-13
7. If blade tends to move toward edge of wheel,
set lever to Partial Tension-Idle/Tracking .
8. Loosen locking handle (P, Figure 7-12) and
slightly rotate tracking knob (R) with your right
hand while continuing to rotate wheel with your
left. Observe blade through tracking window.
Rotating knob clockwise will cause blade to
move toward rear edge of wheel. Rotating knob
counterclockwise will cause blade to move
toward front edge of wheel.
IMPORTANT:
This adjustment is sensitive;
perform in small increments and give blade time
to react to changes.
9. When blade is tracking in center of wheel, re-
tighten locking handle (P), and close upper
door.
10. Move tension lever to Full Tension position, and
connect band saw to power. Turn it on for a brief
time to observe blade in action through tracking
window.
11. If further adjustments are needed, disconnect
from power and repeat above procedure.
7.10 Overview – bearing adjustments
Thrust
(back support)
bearings
are located behind
saw blade and provide support to back of blade
when saw is in operation.
Guide bearings
are located on either side of saw
blade and provide stability for the blade when saw
is in operation. These bearings rotate on an
eccentric shaft so distance from blade can be
adjusted for optimal performance.
7.11 Upper blade guides
Unplug machine from power
source before making any adjustments! Blade
teeth are sharp – use care when working near
blade. Failure to comply may cause serious
injury.
The bearing guides should be set so that contact
between blade and guides will occur only when
blade is under pressure from a workpiece. To adjust
upper bearing guides for proper blade control,
proceed as follows.
Refer to Figures 7-14 and 7-15.
1. Disconnect machine from power source.
2. Blade must already be tensioned and tracking
correctly. Place tension handle in
Full Tension
position.
3. Lower guide post until upper guide bearings are
a few inches off table. (The reason for this will
be evident later in sect. 7.15 )
4. Loosen lock knob (A, Figure 7-14).
O
N
P
R