Use backing pads, adapters, and other accessories that are:
•correct size for tool and for sanding disc or grinding wheel.
•rated at or above the RPM listed in the "WARNING" section on the tool's nameplate.
•the proper accessory for the job.
Sanding Disc and Grinding Wheel Material
Sanding discs and grinding wheels are made of various materials and are designed for different jobs. Be sure that you choose the proper sanding disc or grinding wheel for the job you plan to do.
Selecting Sanding Discs & Grit
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 finishing. Always begin with a coarse grit, using successively finer grits to obtain the desired finish. See your MILWAUKEE Electric Tool Catalog for a complete list of sanding discs.
| Aluminum | Aluminum | Ceramic | ||
| Oxide | Zirconia | |||
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For fast cutting, gen- | Unique grit pattern is | Lasts up to 3 times | |||
eral purpose discs | arranged in clusters | longer thanAluminum | |||
for most metal jobs. | for faster stock re- | Oxide Discs. For | |||
Best for | moval and cleaning. | general metal work- | |||
steel, stainless steel | Ideal for removing | ing. Ideal for tough | |||
or metals requiring | paint | from cars, | jobs. | ||
tough, fast cutting, | boats, | etc. without |
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long lasting abra- | clogging. |
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sives. |
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Installing Backing Pad and Sanding Discs (Fig. 3) | |||||
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| Fig. 3 |
| Disc nut |
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| Sanding disc |
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| Backing pad |
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| Spindle |
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| Gear case |
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1.Unplug tool and place it upside down on a level surface. Remove any accessories from spindle.
2.Slip backing pad onto spindle with flat side away from gear case.
3.Place sanding disc on backing pad and secure assembly to spindle with disc nut.
4.To tighten, press the spindle lock button while turning disc nut clock- wise with the spanner wrench provided.
5.To remove backing pad and sanding disc, unplug tool and reverse procedure.
Sanding (Fig. 4)
Fig. 4
Hold at a 5° to 15° angle
For best result use only this portion of disc
1.Use a clamp, vise or other practical means to hold your work, free- ing both hands to control your tool. Firmly grasp body of tool 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 sander/grinder at 5° to 15° angle (Fig. 4) 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.
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 immediate area. Use successively finer grits to smooth surface.
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.
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
•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
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