TM 9-3405-215-14&P
FIG. 50. BAND POLISHING OPERATION.
Occasionally rub graphite powder into guide fabric to
lubricate and increase band life. Do not use coolant with
polishing bands. Use air nozzle to blow dust away.
Three polishing band grain sizes are available in
aluminum oxide or silicon carbide. See Fig. 51. Use
No. 50 (coarse) for heavy stock removal and soft
materials, No. 80 (medium) for general surface finishing,
and No. 150 (fine) for high polish and light stock
removal.
Application
Cutting Speeds
Grit
Grinding
50-300 fpm (15-90 m/min)
50
Polishing-
850-1000 fpm
80
coarse
(260-305 m/min)
Polishing-
850-1500 fpm
150
fine
(260-450 m/min)
FIG. 51. POLISHING APPLICATION, SPEED AND
GRAIN RECOMMENDATIONS.
26
