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      E-MAIL   Tony@lathes.co.uk
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      Manufactured by Vernon Machinery Manufacturing Company of 1915 East 515T Street, Vernon, Los Angeles, California (and originally sold under that company's "Vernon" label) Sheldon marketed both vertical and horizontal milling machines. The vertical miller (details can be found on the Vernon pages) was really a miniature jig borer along the lines of the well-known Linley  while the horizontal model, shown on this page, was of utterly conventional design and construction but with the advantages of variable-speed drive and an epicyclic backgear built into the V-belt drive pulley to give a range of especially slow speeds.
      The spindle, of heat-treated, ground-finish steel was bored through 9/16", had a No. 9 B & S taper, ran in taper-roller bearings and was supported by a round overarm. The drive system was completely enclosed within the cast-iron cabinet base and consisted of a 1 hp single (or 3-phase) motor which drove a robustly constructed, double-acting expanding-and-contracting (wide V-belt) variable-speed drive unit with ordinary twin V belts providing the final stage of the drive to the spindle; the variable-speed control handle was mounted in a rather inconvenient position on the left-hand cabinet face. The motor was fitted, as standard, with a two-step pulley, so offering both high and low speed belt-drive ranges (Model 3000P) whilst as an option the customer could specify an even slower set of speeds by choosing the epicyclic speed-reduction-gearbox equipped Model 3000PQ  - a feature inaccurately described by Sheldon as a "Backgear"; the arrangement is illustrated at the bottom of this page. The quoted speeds varied during the years of production: in its model 3000PQ form the speed range in 1947 spanned 17 r.p.m. in "backgear" (when combined with the belt-driven low speed) to as high as 1002 r.p.m. in direct-drive on the high-speed belt setting. By the mid-1950s, the direct-drive low-speed pulley was giving 125 r.p.m. to 550 r.p.m. and the high-speed direct-drive 225 r.p.m. to 1100 r.p.m.; in "backgear" the low-speed pulley provided 25 r.p.m. to 100 r.p.m. and the high-speed pulley 36 to 198 r.p.m.. By the 1960s, when the miller was mounted on an entirely different design of sheet-metal cabinet stand - with a tachometer built into its front face - the speeds became 20 r.p.m. to 250 r.p.m. in "backgear" low-range and 75 r.p.m. to 1400 r.p.m. in high-speed direct drive.
      Originally the table was 20 inches long and carried just a single, 7/16" wide centrally-positioned T slot; later models had a slightly longer, 22-inch table (but of the same 5.25-inch width) with 3 T slots. The longitudinal travel was 12 inches when operated by the screw feed (but 10 inches when moved by the optional, lever-operated rack) and the cross travel, generous for a small miller, a useful 5.5 inches; the vertical travel of the knee 9.25 inches. The table was offered with a simple power-feed attachment driven from a 3-step pulley on the rear of the main spindle; it drove through a universally-joined and splined shaft with engagement by a drop-out worm and produced four feed rates of 0.008", 0.0016", 0.0032" and 0.0064" per revolution on the 3000PQ model - and 0.003", 0.005" and 0.008" on the 3000P.
      At least two type types of vertical head were offered for the miller - one a simple "plug-in" type that socketed into the hole used for the round overarm and the other a very useful, self-contained motorised unit by Rusnok that could be swivelled and tilted and contained a lever-action driven quill so making  light-duty precision milling and co-ordinate drilling possible. Photographs of a Vernon-badged  Sheldon horizontal miller can be seen here..

      Early-version of the Sheldon horizontal miller on a cast-iron base.

      Later versions of the miller, though mechanically almost identical to the earlier, were fitted to stands of a cleaner design with much larger chip and coolant trays. The table was made 2 inches longer and given three instead of two T slots - and the drive system modified to give usefully higher speeds.

      Sheldon horizontal miller fitted with the simple, non-quill feed swivelling vertical head that socketed into the hole normally occupied by the round overarm



      Rusnok-manufactured self-contained swivelling and tilting quill-feed vertical head. An ideal addition that made light-duty precision milling and co-ordinate drilling possible

      Completely enclosed within the cast-iron cabinet base, the drive system consisted of a 1 hp single (or 3-phase) motor that drove a robustly constructed, double-acting expanding-and-contracting (wide V-belt) variable-speed drive unit with ordinary twin V belts providing the final stage to the spindle. The tachometer drive components are shown in the top right-hand corner of the illustration.

      Side-mounted
      coolant tank



      E-MAIL   Tony@lathes.co.uk
      Home   Machine Tool Archive   Machine-tools for Sale & Wanted
      Machine Tool Manuals   Machine Tool Catalogues   Belts   
      Books   Accessories


      Sheldon Milling Machines
      Sheldon Home Page  Sheldon 1940s 10-inch Lathes   
      Sheldon 11" & 12" Lathes   Late 13" Lathe      Early 8, 9 & 10-inch Lathes   Sheldon Miller Sheldon (Vernon) Vertical Miller    "Walking Stick" Lathe

      Handbooks, Manuals & Parts Lists are available for most Sheldon Machine Tools
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