Milwaukee Heavy-Duty Sanders and Grinders manual Using Sanding Discs

USING SANDING DISCS

Installing Sanding Discs (Fig. 6)

1.Unplug tool and place it upside down on a level surface as shown. Remove any accessories from spindle.

2.Thread nylon washer onto spindle. Attach backing pad and sanding disc using Fig. 6 to determine type and order of assembly. NOTE: When installing flap disc without hub, position disc nut as shown.

3.To tighten, press the spindle lock button while turning disc nut clockwise.

4.To remove sanding disc and backing pad, unplug tool and reverse procedure.

Fig. 6

Disc nut position

Disc nut

Sanding

disc

Flap disk

Flap disk

A

B

C

D

with hub

Backing

pads

Rubber

A. Polypropylene

B. Spiral

pad

Type 27

flange

C. Rubber

D. Phenolic

Nylon washer

Spindle

Spindle lock button

Sanding (Fig. 7)

1.Use a clamp, vise or other practical means to hold your work, freeing both hands to control your tool. Firmly grasp rear handle and side handle before starting and while tool is in operation. Allow sanding disc to come to full speed before beginning to sand.

2.Hold tool at 5° to 15° angle as shown to ensure proper sanding pressure and control (Fig. 7). 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.

Fig. 7

Hold at a 5° to 15° angle

For best results use only this portion of disc

3.Use long, sweeping, side to side strokes, advancing forward to produce the desired finish.

Removing Welds or Hammer Marks

When removing welds or hammer marks, limit coarse sanding to the imme- diate area. Use successively finer 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 finishing discs

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

Selecting Sanding Discs & Grit

Refer to the table below to select the correct type of sanding disc for your job. Generally, use 16, 24 or 36 grit for heavy stock removal; 50, 60 or 80 grit for medium stock removal and 120 grit for finishing. Always begin with a coarse grit, using successively finer grits to obtain the desired finish. See Catalog for a complete list of MILWAUKEE sanding discs.

Aluminum	Aluminum	Ceramic
Oxide	Zirconia Bi-Cut

Cross Sanding

When finishing 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 finish. Failure to cross sand when changing from a coarse disc to a finishing disc may result in deep scratches and circular marks.

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.

Unique grit pattern is arranged in clusters for faster stock removal and cleaning. Ideal for removing paint from cars, boats, etc. without clogging.

Lasts up to 3 times longer than aluminum oxide discs. For general metal working. Ideal for tough jobs.

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