Used Paul O. Abbe Ball Mill, Model BM-5A. Non-jacketed carbon steel chamber 37" diameter x 48" long. Vessel volume 224 Gallon, 30 Cubic Feet. Approximate 13-1/4" x 14-3/4" charge and discharge port with cover. Driven by a 15 HP 3/60/230/460 Volt, 1765 rpm motor, with a shaft mounted Sumitomo reducer, 14 to 1 ratio. Approximate 28 rpm drum speed. Mounted on carbon steel stands. Serial# 075A1538BM. Built 2007.