PM4 Precision Lapping and Polishing Machine. Integral abrasive autofeed system ensures a controlled flow of abrasive slurry to the lapping plate. Convenient touch panel controls all machine functions. Plate speed variable from 0 to 70 rpm. Timer can be set to run machine for up to 10 hours. Eccentric drive to reciprocate the specimen across the plate. Sweep speed variable from 0 to 45 cycles per minute. 110V, 60 Hz, 3A.