Mounted in the base of the column on a simple, vertically adjustable platform, the motor drove up to the spindle gearbox by V-belts. The two smaller machines both had 10 h.p. motors, the Model 315-16 a 15 h.p. and the 420-16 a 20 h.p.

Lubrication diagram. A main reservoir was fitted inside the knee where, as soon as the main motor started, a mechanical pump both sprayed oil over the various mechanism inside and provided a supply under pressure to the table, column and saddle ways and to the moving parts of the feed mechanism.

Continuing Cincinnati practice since the early 1940s, the heavily stressed knee elevation mechanism - it consisted of a one-piece, nitrided-steel screw, supported on taper roller bearings and running through an aluminium-bronze nut - was completely enclosed in a bath of EP oil. A separate header-tank positioned to one side (and level with the screw's top) fed oil down a pipe to fill the housing as the screw rose and fell.

Optional "Independent Overhead Spindle" - a Ram-type" enclosed-motor, all-geared vertical head that could be left in place and used to support the standard drop-bracket used for horizontal milling.This very useful accessory was available in two forms, with 3 or 5 h.p. motors, each offered with a choice of four speed ranges, set at the time of ordering: 50-750; 75-1125; 100-1500 and 150 to 2250 r.p.m. Both fixed and sliding quill versions were listed, with former being double-jointed and able to be swivelled 360° both parallel and square to the axis of the table. Electrical control was through a swinging pendant.