Use and Care Manual

ManualsBrandsMilwaukee ManualsTools & HardwareReconditioned 7.5-Amp 4-1/2 in. Small Angle Grinder

Aluminum Oxide

For fast cutting, general purpose discs for most

metal jobs. Best for cold-rolled steel, stainless

steel or metals requiring tough, fast cutting, long

lasting abrasives.

Aluminum Zirconia Bi-Cut

Unique grit pattern is arranged in clusters for fast-

er stock removal and cleaning. Ideal for removing

paint from cars, boats, etc. without clogging.

Ceramic

Lasts up to 3 times longer than Aluminum Ox-

ide Discs. For general metal working. Ideal for

tough jobs.

WARNING Never exceed Maximum

Safe Operating Speed of brush. Do not use

a damaged brush or one that is functioning

improperly (throwing wires, out-of-balance,

etc.). These conditions increase the pos-

sibility of further brush failure and possible

injury. Discard and replace damaged brushes

immediately.

Sanding Disc Selection

Use sanding discs and accessories that are:

• correct size as written on tool’s nameplate.

• rated at or above the RPM listed on the tool’s

nameplate.

• correct accessory, wheel type and grit for the job.

Refer to the table below to select the correct type

of sanding disc for your job. Generally, use 24 or

36 grit for heavy stock removal; 50, 60, or 80 grit

for medium stock removal and 120 grit for ﬁ nishing.

Always begin with a coarse grit, using successively

ﬁ ner grits to obtain the desired ﬁ nish. See your

MILWAUKEE Electric Tool Catalog for a complete

list of sanding discs.

USING SANDING DISCS

Test wheel for balance and loose or damaged wires

by letting it spin for one minute before applying it

to the workpiece. During this time, no one should

stand in front of or in line with it.

Control pressure and surface contact between

wheel and workpiece. Too much pressure causes

over-bending of wires and heat build-up causing

premature wire breaking, rapid dulling and reduced

brush life. Instead of more pressure, try a wire wheel

with more aggressive cutting action (increased wire

size, decreased wire length or different brush type

(knot type vs.crimped wire type).

Installing Backing Pad and Sanding Discs

1. Unplug the tool.

2. Wipe the accessories, disc nut and spindle to

remove dust and debris. Inspect the parts for

damage. Replace if needed.

3. Slip backing pad onto spindle with ﬂ at side away

from gear case.

Fig. 9

Spindle

Backing

pad

Disc nut

Sanding

disc

Fig. 10

For best result use only this portion of disc

Hold at a

5° to 15° angle

Removing Welds or Hammer Marks

When removing welds or hammer marks, limit

coarse sanding to the immediate area. Use suc-

cessively ﬁ ner grits to smooth surface.

Finishing Metal

Constantly move across the surface. Work faster on

curved surfaces where contact areas are smaller

and pressure is greater. Flat areas may appear at

the end of the stroke when pressure is too heavy.

Ease up on pressure at end of each stroke and

when reversing strokes.

Troubleshooting

Deep scratches and circular marks can result

from:

• Using too coarse a grit

• Using a partially glazed disc

• Dirt or loose metal on the workpiece

• Failure to sand across the grain when changing

from coarse to ﬁ nishing discs

• Failure to use closed coated discs to reduce

the problem of grains working loose and

scratching the workpiece

Bluish discoloration of metal surface indicates:

• Excessive heat caused by circular motion in a

small area

• Excessive pressure

• Use of worn out or glazed discs

4. Place sanding disc on backing pad and secure

assembly to spindle with disc nut.

5. To tighten, press the spindle lock button while

turning disc nut clockwise with the spanner

wrench provided.

6. To remove backing pad and sanding disc, unplug

the tool and reverse the procedure.

Sanding

Hold tool at 5° to 15° angle to ensure proper sanding

pressure and control. Too great an angle will result

in too much pressure and could cause excessive

wear to the disc and workpiece. Too small an angle

will reduce control.

Use long, sweeping, side to side strokes, advancing

forward to produce the desired ﬁ nish.

Maintaining Tools

Keep your tool in good repair by adopting a regular

maintenance program. Before use, examine the

general condition of your tool. Inspect guards,

switches, tool cord set and extension cord for

damage. Check for loose screws, misalignment,

binding of moving parts, improper mounting, bro-

ken parts and any other condition that may affect

its safe operation. If abnormal noise or vibration

occurs, turn the tool off immediately and have the

problem corrected before further use. Do not use a

damaged tool. Tag damaged tools "DO NOT USE"

until repaired (see "Repairs").

Under normal conditions, relubrication is not neces-

sary until the motor brushes need to be replaced.

After six months to one year, depending on use,

return your tool to the nearest MILWAUKEE service

facility for the following:

• Lubrication

• Brush inspection and replacement

• Mechanical inspection and cleaning (gears,

spindles, bearings, housing, etc.)

• Electrical inspection (switch, cord, armature, etc.)

• Testing to assure proper mechanical and electri-

cal operation

MAINTENANCE

WARNING To reduce the risk of

injury, always unplug your tool before

performing any maintenance. Never disas-

semble the tool or try to do any rewiring

on the tool’s electrical system. Contact a

MILWAUKEE service facility for ALL repairs.

WARNING To reduce the risk of injury,

electric shock and damage to the tool, never

immerse your tool in liquid or allow a liquid

to ﬂ ow inside the tool.

ACCESSORIES

For a complete listing of accessories refer to your

MILWAUKEE Electric Tool catalog or go on-line

to www.milwaukeetool.com. To obtain a catalog,

contact your local distributor or a service center.

WARNING To reduce the risk of injury,

always unplug the tool before attaching or

removing accessories. Use only speciﬁ cally

recommended accessories. Others may be

hazardous.

Cleaning

Clean dust and debris from vents. Keep the tool

handles clean, dry and free of oil or grease. Use

only mild soap and a damp cloth to clean your tool

since certain cleaning agents and solvents are

harmful to plastics and other insulated parts. Some

of these include: gasoline, turpentine, lacquer thin-

ner, paint thinner, chlorinated cleaning solvents,

ammonia and household detergents containing

ammonia. Never use ﬂ ammable or combustible

solvents around tools.

Repairs

If your tool is damaged, return the entire tool to the

nearest service center.

Cross Sanding

When ﬁ nishing a surface that has been prepared by

a coarse disc or wheel, sand at right angles to the

strokes made by the coarser disc. Finishing marks

left from previous sanding are easily seen and

removed for a uniform ﬁ nish. Failure to cross sand

when changing from a coarse disc to a ﬁ nishing disc

may result in deep scratches and circular marks.