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The basic features of Bowl Mill (Puveriser) supplied by BHEL are: Medium speed range of 40 to 60 rpm. Motor speed range of 600 to 1000 rpm. Speed reduction by two method : - Single stage worm & worm wheel set - Planetary Gear Box; Input coal size is 25 mm while output is 65-75 micron. Crushing of coal by replaceable bull ring segment and ...