13
If belt refuses to track properly, the rubber contact
wheel must be adjusted parallel to drive wheel, as
follows:
1. If belt wanders
away
from grinder, loosen top
bolt (E, Figure 8-2) and tap top of cam plate
(F) away from grinder.
2. If belt wanders
toward
grinder, loosen top bolt
(E) and tap top of cam plate (F) toward
grinder.
3. Retighten bolt (E), and use lever (D) for final
tracking.
Figure 8-2: belt tracking
8.5
Platen adjustment
The platen should be set so that it just contacts
underside of tensioned belt, but not so high that
belt rides up over it, which will hasten wear on belt
and machine. Loosen hex nuts (G, Figure 8-3) and
adjust as needed.
Figure 8-3: platen adjustment
9.0
User-maintenance
For safety, turn the switch to OFF and remove plug
from the power source outlet before adjusting and
maintaining the grinder. If the power cord is worn,
cut or damaged in any way, have it replaced
immediately.
9.1
Ring Test
Before replacing a grinding wheel, perform this
simple test on the replacement wheel:
1. Loop a piece of string through the grinding
wheel hole and suspend the wheel by holding
up the string.
2. Tap the wheel with a piece of scrap wood or a
wooden dowel.
3. A good wheel will "ring"; a defective wheel will
"thud". Discard any wheel that does not "ring".
An internal defect may not be apparent by visual
inspection alone. The ring test may identify an
internal crack or void.
9.2
Care of Grinding Wheels
In normal use, grinding wheels may become
cracked, grooved, rounded at the edges, chipped,
out of true or loaded with foreign material.
A cracked wheel should be replaced
IMMEDIATELY. The other conditions can be
remedied with a dressing tool. New wheels
sometimes require dressing to make them round.
See
sect. 9.5.
9.3
Changing Wheels
The JET bench grinder comes equipped with a
general purpose grinding wheel. Wheels vary
according to types of abrasive, hardness, grit size,
and structure. Contact your local distributor for the
proper grinding wheel or wire wheel brush for your
application.
If you replace a wheel, obtain one with a safe rated
speed at least as high as the
NO
LOAD RPM
marked on the grinder's nameplate. Refer to Table
3 to determine correct dimensions for the
replacement wheel.
Model
Wheel
Diameter
Maximum
Width
Center
Hole
IBGM-8
8" 1"
5/8"
Table 3
Your bench grinder will accept most polishing and
buffing wheels available at dealers and hardware
stores.
The use of any other
accessory is not recommended and may result
in serious injury!
To change a wheel
(see Figure 9-1)
:
1. Disconnect grinder from power source.
2. Loosen spark guard (A) and tool rest (B) and
move them away from wheel.
3. Remove wheel guard using a cross-point or
flathead screwdriver.
4. Stabilize wheel by holding opposite wheel
firmly, or placing a wood wedge between
wheel and tool rest.
