Milwaukee Tool 6066-6 - Manual (Page 6)

10 11
Care of Grinding & Cut-Off Wheels
Grinding and cut-off wheels should be protected
from:
• wetness and extreme humidity
• any type of solvent
• extreme changes in temperature
• dropping and bumping
Grinding and cut-off wheels should be stored:
• in an organized way so wheels can be removed
without disturbing or damaging other wheels
• with their safety information
Grinding and cut-off wheels should NOT be:
• dropped
• rolled
• bumped
If any wheel is dropped, rolled, bumped, subjected
to extreme changes in temperature, or has come
into contact with solvents or wetness, discard wheel
immediately.
WARNING To reduce the risk of injury,
the operator should be instructed in the use,
care and protection of grinding wheels.
Fig. 4
Spindle
Grinding wheels
A. Type 28 with hub
B. Type 27 with hub
Type 29 with hub
C. Type 27 with fl ange
Type 29 with fl ange
D. Type 11
Wheel nut
B C D A
Spindle lock button
Guard
E. Type 28
F. Type 27
G. Type 27
H. Type 11
F G H E
Wheel
Hub
adaptor Nylon
washer
Flange Lock
washers
Screws
Guard
Installing Grinding Wheels
1. Unplug tool and place it upside down on a level surface
as shown. Remove any accessories from spindle.
2. Thread fl ange and nylon washer onto spindle.
Attach guard and grinding wheel using Fig. 4
to determine type and order of assembly (See
"Installing, Adjusting, and Removing the Guard"
for attaching guard). NOTE: When installing Type
27 or Type 29 grinding wheels, position wheel
nut according to wheel thickness.
Position the guard in the location which offers
USING GRINDING AND CUT-OFF WHEELS
best control and guard protection. For operating
zones that provide maximum protection for the
operator, see "Grinding". NOTE: When selecting
Type 11 grinding cup wheels, the guard’s skirt
should be adjusted so that no more than 1/8" of
the wheel extends beyond the guard.
3. To tighten, press in the spindle lock button while
turning wheel or disc nut clockwise using the
spanner wrench provided.
4. To remove grinding wheel and guard, unplug tool
and reverse procedure.
Troubleshooting
Deep scratches and circular marks can result from:
• Uneven pressure
• Using a partially glazed wheel - especially on
aluminum applications
• Dirt or loose metal on the workpiece
• Failure to constantly move across surface
Bluish discoloration of metal surface indicates:
• Excessive heat caused by circular motion in a
small area
• Excessive pressure
• Use of worn out or glazed wheels
Inspecting Wheels
Always handle wheels carefully to avoid damage.
Before installing any wheel, always inspect it for
cracks. If wheel is cracked, discard it to prevent
others from using it.
1. Depending on your job, position the guard to pro-
vide maximum protection for the operator (Fig. 5).
Grinding
Selecting Wheels
Grinding is the cutting action of thousands of abra-
sive grains on the face of a grinding wheel. When
grinding metals such as steel and iron, choose an
aluminum oxide grinding wheel. Select a silicon
carbide grinding wheel for stone and concrete. Use
cotton reinforced wheels for non-ferrous metals.
Type 27 reinforced 1/8" cut-off wheels are suited for
small cut-off and shallow notching operations only.
WARNING Only use wheels with Maxi-
mum Safe Operating Speed rated at or above
the RPM listed on the “WARNING” section of
the tool's nameplate. This speed is based on the
strength of the wheel, allowing for a reasonable
measure of safety. It is not meant to imply a
best or most effi cient operating speed. Do not
exceed the Maximum Safe Operating Speed.
WARNING
• ALWAYS hold the tool fi rmly with both hands
using the handles provided; before and
during grinding
• NEVER allow the wheel to bind
• NEVER use a wheel that has been dropped
• NEVER bang grinding wheel onto work
• NEVER grind without proper safety equipment
WARNING To reduce the risk of injury
when grinding, ALWAYS use the proper guard.
ALWAYS properly install the guard.
Operator's Zones
Fig. 5
Type 27 cut-off wheels are only suited for small
cut-off and shallow notching operations.
1. Firmly grasp rear handle and side handle before
starting and while using tool. Allow wheel to come
to full speed before starting.
2. When using a cut-off wheel, hold tool as shown,
using only the edge of the wheel (Fig. 7).
2. If you have just installed a grinding wheel or are
just beginning a period of work, test the wheel
by letting it spin for one minute before applying
it to the workpiece.
NOTE: Out-of-balance wheels can mar work-
piece, damage the tool, and cause stress to
wheel that may cause wheel failure.
3. Firmly grasp rear handle and side handle before
starting and while using tool. Allow wheel to come
to full speed before starting to grind.
4. When grinding, hold tool at a 5 o to 15 o angle as
shown, using constant pressure for a uniform
fi nish (Fig. 6). Too great an angle causes too
much pressure on small areas which may gouge
or burn work surface.
5. Control pressure and surface contact between
wheel and workpiece. Too much pressure slows
cutting speed.
3. Control pressure and surface contact between
wheel and workpiece. Too much pressure slows
cutting speed.
Fig. 7
Using Type 27 Cut-Off Wheels
Fig. 6
Hold at a 5° to 15° angle
WARNING A Type 27 guard must be
installed when using a Type 27 cut-off wheel to
provide maximum protection for the operator
if the wheel should break.