JET 577101 Use and Care Manual download pdf (Page 12)

12

Maintenance

For safety, turn the switch to OFF and remove

plug from the power source outlet before

adjusting and maintaining the bench grinder. If

the power cord is worn, cut or damaged in any

way, have it replaced immediately.

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.

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 uncover an

internal crack or void.

Care of Grinding Wheel

In normal use, grinding wheels may become

cracked, grooved, rounded at the edges,

chipped, out of true or loaded with foreign

material.

Cracked wheels should be replaced

IMMEDIATELY. While any of the other

conditions can be remedied with a dressing tool

(available at most hardware stores), new wheels

sometimes require dressing to make them

round.

Changing Wheels

If you must replace a wheel be sure to 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 2 to determine correct

dimensions for the replacement wheel.

Model

Wheel

Diameter

Maximum

Width

Center

Hole

JBG-6A

6" 3/4" 1/2"

JBG-8A

8" 3/4" 5/8"

JBG-10A

10" 1" 1"

Table 2

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 (refer to Figure 4):

1. Disconnect grinder from the power source.

2. Loosen the spark guard (A) and tool rest (B)

(refer to the Adjustment section on page 11)

and move the spark guard and tool rest

away from the wheel.

3. Remove the guard cover using a Phillips or

flathead screwdriver.

4. Stabilize the wheel by holding the opposite

wheel firmly.

5. Unscrew the wheel nut (C) with a 1" wrench.

Note: Turn the locking nut on the right-hand

wheel counterclockwise to loosen. Turn the

locking nut on the left-hand wheel clockwise

to loosen.

6. Remove the outer flange (D) and wheel (E).

7. Clean flanges. Check the flanges to make

sure they are flat. Wheel flanges that are not

flat will cause the wheel to wobble.

8. Put the inner flange, wheel (E), outer flange

(D) and nut (C) on the shaft. Tighten the nut.

Do not over tighten. This may cause the

wheel to crack.

9. Replace the guard cover. Adjust the spark

guards and tool rests to a 1/16" clearance

from the wheel (see Adjustments on

page 11).

Figure 4

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