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      email: tony@lathes.co.uk
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      Rockwell Delta 10-inch Lathe
           Copies of the maker's Manual is available for this lathe

      Delta 11" lathe    Delta 14" lathe

      Should any reader have a Delta 10-inch that they would like to
      see featured in the Archive, the writer would be interested to hear from you

      Delta were well known in America for their range of metal and woodworking machine tools. The original manufacturers of the metal-turning lathe line were Rockwell International but, in 1984, their machinery and tool operations were purchased by Pentair Incorporated of St. Paul, Minnesota - a company now known as Delta International Machinery Corporation, with headquarters in Pittsburgh, Pennsylvania; unfortunately, they no longer make either metal or wood-turning lathes.
      Smallest of the metal-turning machine in the Company's range, the 10-inch (illustrated below) was available with either 24" or 36" between centres and fitted with a mechanical, infinitely-variable speed drive, driven by Rockwell's own 0.75 hp 1-phase or 3-phase motor, to give speeds between 50 and 1500 rpm. The expanding and contracting pulleys were mounted either underneath inside the cabinet stand or behind the headstock on the bench, whilst the final drive to the spindle was by twin A"A" section V-belts; a very similar arrangement was used on the English Raglan lathe. On the bench-mounted machine speed-control was built in with a handwheel, positioned neatly and conveniently just below the screwcutting gearbox, that could be locked into a speed range, selected by the operator, with pre-set upper and lower limits - a safety feature which had a particular appeal to those responsible for equipping or running a training workshop frequented by forgetful or ham-fisted teenagers. On lathes fitted to the maker's stand speed control was by a long lever, a sticker warning against straining the mechanism by trying to operate it when the motor was not running.
      Particularly well-engineered, the headstock held a heat-treated and ground spindle with a bore of 15/16" and a (4C) collet capacity of 3/4". It ran in a large, double-row angular-contact, pre-loaded precision ball bearing at the spindle nose end and a "floating" bearing at the outboard end designed to compensate for spindle expansion as the machine warmed to its task. According to the sales literature the spindle was bored with a No. 9 Brown and Sharpe (B & S) taper and fitted with a short, hardened bush to take a No. 2 Morse taper centre. However, it is possible that later lathes may have been modified in this respect and the nose bored to the more common Morse standard. The ground-finished spindle thread was 1
      1/2" x 8 t.p.i. 
      A full screwcutting gearbox with 54 English threads from 4 to 224 t.p.i was fitted as standard, as was power cross feed. The latter was provide with an adjustable clutch, operated by an "over-centre" lever in the middle of the apron, and could be adjusted (whilst working) from a light setting designed to slip and protect the lathe to one where all the cutting force available was fully utilised.
      Two larger Rockwell/Delta lathes were also manufactured: the 11-inch and splendid, well-specified 14-inch.

      Found upside down and damaged in a scrap yard, this Delta Rockwell 10-inch has been beautifully restored to full working order

      Robust drive system with twin "A" section V-belts and a compact backgear assembly

      A repaired bull wheel: found stripped, the remains of the original teeth were turned off and a new ring of them pressed into place and mechanically secured.

      Another neglected Delta Rockwell 10-inch awaits restoration

      This lathe, mounted on the maker's stand, has the lever-controlled variable-speed drive

      Bench-mounted version of the Delta Rockwell 10-inch with the integral handwheel-controlled variable-speed drive. Note the optional taper-turning unit.

      Carriage assembly showing over-centre power-feed engagement lever the tension of which could be adjusted as the machine ran.

      Headstock assembly with twin V belt drive and a usefully large gear on
      the end of the spindle to even out wear over the very long-term

      Variable-speed drive unit, 10" bench model.

      Variable speed drive unit of the underdrive lathe.

      Two-lever Screwcutting Gearbox

      Variable-speed control handwheel and speed-indicator chart of the
      version intended for mounting on the owner's own stand.

      Underdrive lathe - variable-speed drive layout.

      Delta 11" lathe    Delta 14" lathe
      The maker's Manual is available for this lathe

      Rockwell Delta 10-inch Lathe
      email: tony@lathes.co.uk
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