Acer Supra 1020 AHD Surface Grinder   5 HP spindle motor. Front mount spindle with run-out within 0.0001". Overall flatness within 0.00015" at 10" x 20" grinding capacity. Revolutionary sensor triggering directional control valve. Microprocessor controlled 24-volt control circuit. Fully ribbed machine base and column. Two speed rapid elevation travel. Recirculating auto lubrication system for all slideways and leadscrews. Turcite-B coated table and condensed. Precise stepping motor for downfeed incremental control - 0.00005~0.002". Electronic saddle lock device. Table speed is adjusted with flow-control turning knob. FC 25 casting weighing at 3,916 lbs. Hold maximum work load at 840 lbs.     The manufacturer reserves the right to modify the design, specifications, mechanisms, etc. to improve the performances of the machines without notice. All specifications shown above are for reference only.