Nilfisk-ALTO Classic 12 - Manual (Page 14)

Page 14 AMERICAN SANDERS TECHNOLOGY Classic 12 Belt Sander Operator's Manual
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, pre-existing 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.
Finishing Cuts
The purpose of a finishing cut is to remove the scratches produced during the initial cut. Use a fine (60 - 80
grit) 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 grit of abrasive (80 -
100 grit). Care should be taken in selecting the grit size of the abrasive. A very fine grit will close the pores
of the wood. If the pores of the wood are closed it will not accept stain.
If glazing or burning should occur immediately into a finishing cut, reduce the sanding pressure and/or select
a coarser abrasive. If it should occur during a finishing cut, the abrasive has dulled and must be replaced.
Sanding Cuts and Sandpaper
Aluminum Silicon Ceramic
Grit Use Oxide Carbide Alum. Oxide
Abrasive Belts
Note: All part numbers listed are for a carton of 10 belts
For removing gross imperfections and restore evenness
16 to old flooring. To remove build-up of paints and varnishes. - 945856 -
36 For initial cut on new flooring (maple, oak). For removing
minor imperfections and finishes from old flooring.
- 945854 945916
40 For initial cut on new flooring (oak, walnut). For removing
minor imperfections and finishes from old flooring.
- 945853 945917
50 For initial cut on new flooring (cedar, pine, fir)
For clean-up from initial cut of 16 grit.
- 945852 945918
60 For clean-up from initial cut of 36 - 40 grit. 945851 - 945919
80 For finishing cut on certain hardwoods. For clean-up 945850 - 945920
of initial cuts of 50 grit.
100 For finishing cut on certain hardwoods where a smooth 945849 - 945921
surface is desired.
120 For finishing cut on certain conifers. 945848 - 945922
150 For finishing cut on certain conifers where a smooth 945847 - 945923
surface is desired.
180 For surface roughing between coats of finish. 945846 - -