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Top-of-the-range Cincinnati Toolmaster Model H-V with geared overarm, special double-swivel bracket for the head, horizontal arbor and support bracket, a 1-D variable-speed drive head at the rear and power longitudinal and cross feed units
Continued:
Identical to the 1-D in all respects except the head, the 1-E retained the lower section containing the reduction gearing and quill feed, but used a cheaper drive system that was, in effect, a more robust version of the all-V-belt-drive head used on earlier models.
Both the 1-D and 1-E are easily recognised by their large head, with the motor set well to the rear of the spindle line, and a rectangular rather than square switch housing on the front. Aided by the torque-enhancing backgear, spindle speeds spanned a most useful range: from 80 though 137, 234, 400, 600, 1030, 1750 to 3000 r.p.m.
Interestingly, the other model in the range, the very rare H-V (Horizontal-Vertical), was based on the 1-C and used the same all-geared head. Also fitted, on the back of the ram was a variable-speed Type 1-D head with power down-feed. So equipped, the Toolmaster became, in this ultimate form (though at some considerable cost), an even more versatile and useful machine. Speeds from the geared head could be specified as 75 to 1130 r.p.m or, optionally (and at no extra cost) from 50 to 750 r.p.m.
Until the late 1950s all versions were listed as having a 36" x 10" table with three 11/16" T-slots, hand-feed only as standard (independent power feeds to the saddle and table were optional) with a travel of sixteen inches longitudinally, ten inches laterally and seventeen inches vertically. For an extra charge a forty-two inch table could be supplied that had twenty-two inches of travel - a fitting that was eventually to be made part of the standard specification. However, when the forty-two inch table was standard, a further offer was made of a forty-eight inch table with twenty-eight inches of travel. Other table-related options were hardened and ground feed screws, a set of precision measuring equipment for longitudinal, lateral and vertical movements (and the various guides to carry the rods and DTIs); built-in optical measuring equipment and, of course, a coolant supply with the necessary electric pump and pipework. The feed-screw micrometer dials were usefully large, with well-spaced graduations, and handles were always fitted at both ends of the table. One useful fitting, common to all types, was an anti-backlash mechanism on the table-feed screw. This was not the complex unit used on the Dial Type and other general-purpose millers, but a simple arrangement where the nut was in two parts, one end being of larger diameter and threaded to accept two cap-headed screws that were used to drew it, laterally, against the feed screw. Table power feed, when specified, could be fitted to either or both longitudinal and traverse directions, with each having an identical nine rates from 0.75 to 15 inches per minute. Power was from a flange-mounted motor driving a self-contained, oil-immersed gearbox with control by the juxtaposition of two quadrant levers. Feeds were automatically disengaged by the usual dogs carried in a T-slot that ran down the length of the table's front face and proper micrometer stops - ideal for hand work - were also fitted as part of the ordinary equipment (but only on the non-power-feed versions).
All sliding surfaces were fitted with what the makers described as a headless type gib strips; these were of the ordinary tapered type, but with a socket-head screw let in flush at one end in such a way that a flange on its stem engaged with a cut-out in the strip. Adjustment could be fiddly and some effort was needed to get a good sliding fit with no play.
As a concession to heavy industrial use, and to guard against operator neglect, two separate one-shot, pull-and-release lubrication systems were fitted. One supplied oil to the saddle-to-table and saddle-to-knee ways and the longitudinal and cross feed nuts whilst the other lubricated the knee-to column ways and all the component parts of the knee-elevation mechanism - the screw and nut, support bearing and spiral-bevel gears. However, this still left the user to check seven different oil levels and attend to two greasing points.
Unfortunately, instead of a standard spindle nose on the 1A and 1B heads, the company chose to use a special type of the kind also employed on the Monoset tool and cutter grinder and Contourmaster die sinker and copy miller. However, removing the Monoset holder (the collets were fragile and not held in great esteem by users) should reveal a robust No. 40 INT taper. Adaptors may also have been available to take spring collets in A and C sizes - by the tooling specialist Weldon - as well as Morse taper and Brown & Sharpe fittings..
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