Classing mill
A well-thought-out, strongly-made machine, the Clausing horizontal miller had a stiffly-braced, one-piece cast iron column that carried twin, solid-steel bars to act as the horizontal arbor support. The alloy-steel spindle, with a hardened 30 A.S.A. (International) taper nose, ran in lubricated-for life 3.5" diameter Timken taper roller bearings and carried a helical, lathe-like "backgear" assembly (running in an oil bath) that multiplied the torque available by approximately 6 and provided a slip-free, high-torque drive to the slower speeds. Clausing guaranteed a better than a one-half thousandth of an inch run-out on the spindle that was bored through 21/32" and used a 21/32" x 13 t.p.i draw bar. A choice of three arbor diameters was offered: 7/8", 1" and 1-1/4" An expanding-and-contracting infinitely-variable speed pulley drive system was fitted (driven by a 1.5 hp single or three-phase motor) with the rotary speed selector (which operated a...