Jet jbg-10a User Manual

 

12

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. 

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. 

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. 

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. 

6" 3/4" 

1/2" 

8" 3/4" 

5/8" 

10" 1" 1" 

Your bench grinder will accept most polishing 
and buffing wheels available at dealers and 
hardware stores. 

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 (B) 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 (C) and wheel (D). 

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 (D), outer flange 

(C) and nut (A) 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).