Alto American 12 Operator's Manual page 12

A. First pass forward, right to left.
B. First pass reverse, retrace same path.
C. Second pass forward, overlap ½ the drum width. D. Second pass reverse, retrace second path forward,
etc....for the entire room
E. Work the remaining unsanded floor in the
same fashion, right to left.
Figure 6
Page 12 AMERICAN SANDERS TECHNOLOGY - American 12 Floor Sander Owner's Manual