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ADDITIONAL SAFETY RULES ENB038-3
1. Always wear safety goggles and ear protec-
tors during operation.
2. Always be sure that the tool is switched off
and unplugged before carrying out any work
on the tool.
3. Keep guards in place.
4. Use only wheels with correct size and wheels
having amaximum operating speed atleast as
high as the highest No Load Speed marked on
the tool’s nameplate. When using depressed
center wheels, be sure to use only fiberglass-
reinforced wheels.
5. Check the wheel carefully for cracks or dam-
age before operation. Replace cracked or
damaged wheel immediately.
6. Observe the instructions of the manufacturer
for correct mounting and use of wheels.
Handle and store wheels with care.
7. Do not use separate reducing bushings or
adaptors to adapt large hole abrasive wheels.
8. Use only flanges specified for this tool.
9. Do not damage the spindle, the flange (espe-
cially the installing surface) or the lock nut.
Damage to these parts could result in wheel
breakage.
10.For tools intended to be fitted with threaded
hole wheel,ensure that thethread in thewheel
is long enough to accept the spindle length.
11. Before using the tool on an actual workpiece,
test run the tool at the highest no load speed
for at least 30 seconds in a safe position. Stop
immediately if there is any vibration or wob-
bling that could indicate poor installation or a
poorly balanced wheel. Check the tool to
determine the cause.
12.Check that the workpiece is properly sup-
ported.
13.Hold the tool firmly.
14.Keep hands away from rotating parts.
15.Make sure the wheel is not contacting the
workpiece before the switch is turned on.
16.Use the specified surface of the wheel to
perform the grinding.
17.Do not use cutting off wheel for side grinding.
18.Watch out for flying sparks. Hold the tool so
that sparks fly away from you and other per-
sons or flammable materials.
19.Pay attention that the wheel continues to
rotate after the tool is switched off.
20.Do not touch the workpiece immediately after
operation; it may be extremely hot and could
burn your skin.
21.Position the tool so that the power cord
always stays behindthe tool during operation.
22.If workingplaceis extremelyhot andhumid,or
badly polluted by conductive dust, use a
short-circuit breaker (30 mA) to assure opera-
tor safety.
23.Do not use the tool on any materials contain-
ing asbestos.
24.Do not use water or grinding lubricant.
SAVE THESE INSTRUCTIONS.
OPERATING INSTRUCTIONS
Installing the wheel guard (Fig.1&2)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the wheel
guard.
Mount the wheel guard with the tab on the wheel
guard bandaligned with thenotch onthe bearing box.
Then rotate the wheel guard 180° clockwise (for
9520NB) or counterclockwise (for 9521NB and
9522NB). Be sure to tighten the screw securely.
Side grip (auxiliary handle) (Fig. 3)
For 9521NB and 9522NB only
For your own safety, always use the side grip. The
side grip can be installed on either side of the tool.
Installing or removing the depressed center
wheel (Fig.4&5)
Important:
Always be sure that the tool is switched off and
unplugged before installing or removing the wheel.
Mount the inner flange onto the spindle. Fit the wheel
on over the inner flange and screw the lock nut onto
the spindle. Press the shaft lock to prevent spindle
rotation, then use the lock nut wrench to tighten the
lock nut securely.
Warning:
Only actuate the shaft lock when the spindle is not
moving.
Switching ON and OFF (Fig. 6)
CAUTION:
Before plugging in the tool, always check to see that
the switch actuates properly and returns to the ‘‘OFF’’
position when the rear of the switch lever is
depressed.
To switch on, depress the rear of the switch lever and
push it forward. The depress the front of the switch
lever to lock it.
To switch off, depress the rear of the switch lever.
Operation (Fig. 7)
Keep the edge of the wheel or disc at an angle of
about 15° – 30° to the workpiece surface. During the
break-in periodwith a newwheel, do notwork the tool
in the B direction. It will cut into the workpiece. Once
the edge of the wheel has been rounded off by use,
the wheel may be worked in both Aand B directions.
WARNING:
•
It should never be necessary to force the tool. The
weight of the tool applies adequate pressure. Forc-
ing and excessive pressure could cause dangerous
wheel breakage.
9520NB/9521NB/9522NB (’100. 8. 11)
6