Chatter-Wave Prevention; Sanding Cuts & Sandpaper - American Sanders FloorCrafter 8 Manual Del Operador

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Initial Cut
The purpose of the initial cut is to remove old finish and gross imperfections on the floor surface. The sanding equipment should be adjusted to
heavy sanding pressure setting and a coarse abrasive belt should be used. If the surface is severely damaged by deep scratches, preexisting dwell
marks, uneven planks, etc., it may be necessary to sand across or diagonally to the grain to restore evenness to the surface. If these conditions are
not present, the initial cut should be done in the direction of the grain.
If glazing, loading, or burning takes place immediately into an initial cut, select a coarser abrasive. If this should occur during an initial cut, the
abrasive has dulled and must be replaced.
Final Cuts
The purpose of a finishing cut is to remove the scratches produced during the initial cut. Use a fine (60 - 80 grit) grain abrasive and a reduced
sanding pressure setting.
If the surface remains rough after a finishing cut, it may be necessary to use an even finer grain of abrasive (80 - 100 grit). Care should be taken in
selecting the grit size of the abrasive. A very fine grain will close the pores on a wood floor making admission of a stain difficult.
If glazing or burning should occur immediately into a finishing cut, reduce the sanding pressure. If it should occur during a finishing cut, the abrasive
has dulled and must be replaced.
American Sanders are designed and manufactured to the most rigid tolerances. However,
after a finishing cut it is possible to see "chatter" or "waves".
The best guarantee to remove the chatter is to finish the floor with a rotating horizontal
sander, such as American Sander's RS-16.
To minimize chatter when using a belt or drum sander the following steps should be taken:
1. DRUM MARKS...are caused by the operator lowering the drum to the floor without
forward traverse. These marks should be removed by cutting at a 45 degree angle to
the mark. Cutting at the mark while maintaining the same path will only increase the
mark depth and width.
(See figure 14)
UNEVEN WALKING SPACE...can leave lengthy "waves". The machine cuts more
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material during the slower pace. Pay particular attention to a steady even pace.
3. EXCESSIVE LIGHT CUTS...may reveal high spots on the paper/contact wheel and
cause chatter. Take a heavier cut and increase the pace.
4. DEBRIS...lodged between the paper and the drum will leave chatter. On a belt sander, debris may be adhered to the drum. Insure the drum is clean and free of
debris before placing the paper on.
5. ABRASIVE QUALITY...may vary. Belt seams can be thicker on low quality paper and cause chatter. Use only American Sanders specified sandpaper. Store
abrasive according to manufacturer's recommendation.
PROPER CARE OF YOUR MACHINE CAN MINIMIZE
CHATTER AND WAVES.
1. V-BELTS...can cause vibration and chatter if they are of low quality. Use only belts specified by American Sanders.
2. TRUCK AND CASTER WHEELS...with flat spots, out-of-roundness, or debris adhered to their surface can cause "waves" or a "chatter effect". Always clean
and inspect all wheels before starting to sand, and before the finish cut. Replace or true the wheels if found to be out-of-round. Never allow the sander to
stand on hard surfaces for lengthy periods of time.
3. DUST PICK-UP SHOES...may need adjusted differently for different materials that are to be sanded. An improperly adjusted shoe will leave trailing debris
that will be run over by the wheels and cause "random waves".
CONTACT WHEELS (DRUMS)...may be out-of-round and cause "chatter". Contact your American Sanders dealer for assistance to true or replace the drum.
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Sanding Cuts & Sandpaper
Chatter Wave Prevention
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Figure 14