Baldor MN903 User Manual
MN903
No. 275P Replaces 275N
LB7008
Instruction Manual For Baldor Grinders
SAFETY NOTICE:
WARNING statements describe conditions that may lead to personnel injury including potentially
fatal injuries if the machine is not properly used and warnings are not properly followed.
Caution statements describe conditions that may lead to equipment damage.
Electrical shock can cause serious or fatal injury. Only qualified personnel should install,
maintain or troubleshoot this equipment.
W ARNING: Do not operate this grinder until you are sure that you are completely familiar with the safe
operation of the grinder, all accessories and safety equipment. Improper use can lead to
severe injury. This manual defines proper use of this equipment. Before using this
equipment for any other use, please consult Baldor. Contact Baldor if you do not
understand any procedure or operation concerning this grinder or this manual.
WARNING: Prevent electrical shock hazard and accidental machine operation. Always disconnect
grinder from the power source before servicing, changing accessories (such as wheels,
tool rest, spark arrestor, etc.) or before performing maintenance.
W ARNING: Avoid accidental starting. Make sure switch is in “OFF” position before connecting to
power source.
W ARNING: Be sure the system is properly grounded before applying power. Do not apply power
before you ensure that grounds are connected. Electrical shock can cause serious or fatal
injury. Follow the National Electrical Code (NEC) and local codes for the safe installation
of this equipment.
WARNING: Always use safety glasses with side shields (or full face shield) when operating grinder.
Do not use ordinary eyeglasses. Also use face or dust mask if cutting operation is dusty.
WARNING: Unsuitable accessories or attachments added to this machine can create hazards. Baldor
accessories are specifically designed to be used with this grinder. Use accessories or
attachments only in the proper intended manner. Accessories or attachments obtained
from another source may cause hazards. Consult the manufacturer before use.
WARNING: Keep guards in place and in working order. Guards are design to prevent injury. Never
operate this equipment if a guard is damaged, missing or improperly installed.
WARNING: Remove adjusting keys and wrenches from this product after use. Check to see that keys
and adjusting wrenches are removed from grinder before turning it on. Projectiles can
cause severe injury to yourself or others.
WARNING: Keep work area clean and well lighted. Clutter and poor lighting invites accidents.
W ARNING: Don’t use in dangerous environment. Don’t use grinders in damp or wet locations, or
expose them to rain. Electrical shock can cause serious or fatal injury. Follow the
National Electrical Code (NEC) and local codes for the safe installation of this equipment.
W ARNING: Do not wear loose clothing, neckties, rings, bracelets, or other jewelry to get caught in
moving parts. Nonslip footwear is recommended. Wear protective hair covering to contain
long hair.
W ARNING: Don’t over reach. Keep proper footing and balance at all times. A rotating wheel or belt
can catch an article of clothing and cause personnel injury.
WARNING: Secure work. Use clamps to secure the work piece when practical. It’s safer than using
your hand and it keeps hands away from wheel.
WARNING: When starting a grinder for the first time, or after installing a replacement grinding wheel,
it is most important that the operator stand aside for at least one minute of rotation at full
speed. This is the correct practice since grinding wheels can disintegrate if they have
received damage during shipping or handling.
WARNING: Always have the grinder switch in the “OFF” position when changing the position of the
pivot arm. Do not attempt to change the pivot arm position while the belt is moving as this
will create a hazardous situation for the operator.
1MN903
SAFETY NOTICE Continued
WARNING: Never install a wheel that is damaged, such as a chip or crack on any surface. A damaged
wheel can disintegrate while rotating at a high RPM or when work is placed against the
wheel. This can severely harm the operator or others in the area.
WARNING: Check damaged parts. Before further use of the grinder, a guard or other part that is
damaged should be carefully checked to assure that it will operate properly and perform
its intended function. Check for alignment of moving parts, binding of moving parts,
breakage of parts, mounting, and any other conditions that may affect its operation. A
guard or other part that is damaged should be properly repaired or replaced.
WARNING: Use proper extension cord. Make sure your extension cord is in good condition. When
using an extension cord, be sure it is rated for the voltage and current rating of your
product. An undersized cord will cause a drop in line voltage resulting in loss of power
and overheating. Table 1 shows the correct wire size to use depending on cord length and
nameplate ampere rating. If in doubt, use the next heavier gauge. The smaller the AWG
gauge number, the heavier the cord.
W ARNING: Dust created during grinding, sawing, power sanding, drilling, and other activities may
contain chemicals known to the State of California to cause cancer, birth defects or other
reproductive harm.
WARNING: Keep children and visitors away. Remove starter keys turn off master switches. Padlock
equipment or work area when not in use.
W ARNING: Never leave grinder running unattended. Always turn power off after use.
Caution: Don’t force grinder. It will do the job better and safer at the feed rate for which it was
designed.
Caution: Use right tool. Don’t force tool or attachment to do a job for which it was not designed.
Caution: Maintain grinder with care. Keep grinder clean for best and safest performance.
Always use guard and eyeshield. Operating the grinder without the guard and eyeshield or
with damaged guard and eyeshield must not be attempted because of the hazard this
introduces.
Do not overtighten wheel nut. A damaged grinding wheel can disintegrate in all directions.
An overtightened wheel nut can stress the grinding wheel and cause it to disintegrate during
operation. Wheel nut should be tightened just enough to prevent grinding wheel from slipping
on shaft when grinding. Use only flanges furnished with this grinder. The flanges furnished
with the grinder are designed to grip the grinding wheel without introducing excessive
stresses in the wheel.
Replace a cracked or chipped wheel immediately. A cracked wheel will disintegrate when
operated, causing a hazard to operator and nearby personnel. If a wheel has a chip or crack
on any surface, do not use it.
Maintain 1/8 or less clearance between tool rest and wheel. This clearance is necessary
to prevent the work piece from becoming wedged between the wheel and tool rest and
restricting nip areas in the machine.
Grind on grinding face (periphery) of wheels only. Grinding on side of wheel weakens the
wheel and may cause wheel breakage. Also, grinding on the side of wheel introduces an
additional hazard due to absence of a tool rest.
2 MN903
SAFETY NOTICE Continued
No Load RPM
Use wheels rated at or over rated grinder RPM shown in the following table.
W
D
H
Grinding
Face
Ginder Wheel
Wheel Size
D" Diameter
(inches)
6″
6″
7″ 1″
7″ 1″
8″ 1″
8″ 1″
10″ 1″
12″ 2″ 114″ 3″ 1-
W" Width
(inches)
3
/
″
4
3
/
″
4
H" Arbor Diameter
(inches)
1
/
″ 1800
2
1
/
″ 3600
2
5
/
″ 1800
8
5
/
″ 3600
8
3
/
″ 1800
4
3
/
″ 3600
4
7
/
″ 1800
8
1
/
″ 1800
4
1
/
″ 1800
4
(on Nameplate)
Spark Arrestor
Eyeshield
Spark Arrestor
Eyeshield
Grinding Face
Grinding Face
Wheel Flange
Guard Cover
Exhaust Port
Tool Rest
Exhaust Port
On-Off Switch
Tool Rest
Tool Rest Support
Installation When you receive your unit, there are several things you should do immediately.
1. Observe the condition of the shipping container and report any damage immediately to
the commercial carrier that delivered the product.
2. Verify that the part number you received is the same as the part number listed on your
purchase order.
WARNING: When starting a grinder for the first time, or after installing a replacement grinding wheel,
it is most important that the operator stand aside for at least one minute of rotation at full
speed. This is the correct practice since grinding wheels can disintegrate if they have
received damage during shipping or handling.
3. Mount grinder on solid bench. The grinder must be securely bolted to a rigid mounting
surface. If a pedestal is used, first bolt pedestal securely to floor and then bolt grinder to
pedestal.
4. Check grinder nameplate to make certain the rating is correct for the power source,
voltage and frequency. See electrical and grounding instructions for electrical service
connection.
5. Adjust spark arrestor for approximately 1/16″ clearance between it and grinding wheel.
Maintain 1/8″ or less clearance between spark arrestor and wheel as wheel wears.
6. Adjust angle of tool rest on support to desired position and tighten nut securely. Adjust
tool rest support on guard to attain approximately 1/16″ clearance between tool rest and
grinding wheel and tighten nut securely. Maintain 1/8″ or less clearance between tool
rest and wheel.
7. Adjust eyeshield to position aligning center of eyeshield in line of sight to tool rest.
3MN903
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