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the angle is too steep, the pressure is concentrated on a small area causing burning to the work surface.
Excessive or sudden pres- ! WARNING sure on the wheel will slow
grinding action and put dangerous stresses on the wheel.
When grinding with a new wheel be certain to grind while pulling tool backwards until wheel becomes rounded on its edge. New wheels have sharp corners which tend to “bite” or cut into workpiece when pushing forward.
Sanding Operations
SELECTING SANDING DISC
Sanding discs are made of extremely hard and sharp aluminum oxide grits, phenol- resin bonded to a sturdy fiber backing for fast
Sanding discs range in grit from 16 (very coarse) to 180 (very fine). To obtain best results, select sanding discs carefully. Many
jobs require the use of several grit sizes and at times both “open coat and closed coat” discs are required to get the job done faster. See chart for application examples.
Operation: Refinishing painted wood or metal surfaces.
REMARKS | GRIT |
To remove paint and to smooth | Coarse |
surface irregularities. | |
To smooth | Medium |
the rough sanding. | |
To remove scratches left by | Fine |
previous discs. | |
To smooth surfaces for painting, | Very Fine |
polishing or waxing. | |
|
|
SANDING TIPS
For best results, tilt the Disc Sander at a 10° to 15° angle while sanding so that only about 1" of the surface around the edge of the disc contacts the work.
!WARNING If the disc (accessory) is held flat or the back edge of
the disc comes in contact with the work, a violent thrust to the side may result.
If sander is tilted too much, sanding action will be too great and a rough cut surface or gouging and snagging will result.
Guide the Disc Sander with crosswise strokes. Be careful not to hold the sander in one spot too long. Do not use a circular motion, as this makes swirl marks. Test before use on scrap stock.
Do not force or apply pressure when sanding. Use only the weight of the tool for pressure. Excess pressure actually slows the tool down. If faster stock removal is desired, change to a coarser grit disc.
Remove gummy paint from metal with an “open coat” disc. Sand until sparks start to
appear, then stop and change to a “closed coat” disc to remove any remaining paint.
SANDING WOOD
When sanding wood the direction of the disc motion at the contact point should parallel the grain as much as possible. The rapid cut of discs and the swirl type scratch pattern they occasionally create generally prohibit their use for producing the final finish.
Scratches and circular marks are usually the result of using too coarse a grit. When changing to a finer grit, move across the sanding lines that were made by a previous coarser disc.
SANDING METAL
When sanding automobiles or appliances, wipe the metal clean with a
For heavy duty work, use a coarse grit disc first.