<code id="sa0bz"></code>
    <th id="sa0bz"></th>

  1. <strike id="sa0bz"></strike>
      <strike id="sa0bz"></strike><del id="sa0bz"><small id="sa0bz"></small></del>
      <th id="sa0bz"><video id="sa0bz"></video></th>

      email: tony@lathes.co.uk
      Home   Machine Tool Archive   Machine-tools Sale & Wanted
      Machine Tool Manuals   Catalogues   Belts   Books   Accessories

      Boxford "Union" G200
      Tool & Cutter Grinder

      A Manual is available for the Boxford G200

      Built to a design first used successfully in the early years of the 20th century, the hand-operated Boxford G200 "Universal" tool and cutter grinder employed a rear-mounted, rise-and-fall, swivelling head to carry the grinding wheel. As such, like similar models from, for example, Elite, Bauerle and vintage Jones & Shipman, it enjoyed the ability to perform not only as a particularly effective machine when engaged on cutter grinder work but also to act as both a surface and (with a motorised attachment on the table) a cylindrical grinder as well. While not in the same capacity class as, for example, the well-proven and popular Cincinnati No. 2, its intended use was for smaller work - and as a compliment to larger machines.
      Of a clean, modern appearance, the G200 was available as both a bench and cabinet-mounted model - though the latter appears to have been the more common with a stand that had a locking, 2-shelf cupboard. Manufactured from the 1970s until the late 1980s (the base price in 1977 being ?195) in 1988 when obviously desperate to get rid of excess stock, one dealer was advertising: "
      ?due to an aborted export contract we are offering a 40% discount on the ex-works price?/I>"
      Able to swing a diameter of 200 mm over its 500 x 120 mm table, the G200 had two spindle speeds of 3,500 and 5,500 r.p.m. with power coming from a totally enclosed, fan-cooled 0.56 kW 3-phase motor driving through a smooth-running flat belt that ran over 2-step pulleys.  Motor control was by a push-button reversing contactor with the usual overload and no-volt safety features.
      Supported in pre-loaded, angular-contact bearings of a precision grade, the spindle was formed on its end with a taper to accept the supplied wheel carriers. Head rise and fall was by means of a full-circle, forward facing, micrometer-dial equipped handwheel on the right-hand side of the base. The head, lockable in its vertical setting by a lever on the left-hand side of its support column, could be inclined 20?above and  20?nbsp; below horizontal and swivelled through 360? 
      With a longitudinal travel of 300 mm and in traverse of 130 mm, the table was of the usual design for a tool and cutter grinder and consisted of two parts, one above the other, with the 180?swivelling top section machined with a single, centrally disposed T-slot. Like many of its kind, instead of a metal-to-metal slides, the Boxford used a table running on anti-friction bearings with its longitudinal travel by quick-action rack and pinion gearing, the handwheel being fitted with both horizontal and radially disposed grips. To allow a job to be positioned and ground more easily, the operator could set, via  friction device, the most comfortable working position for the operating handle. Micrometer dials could be either Imperial - when the divisions were engraved in increments of 0.001" - or metric, in which case they became 0.02 mm.
      In meeting the requirements of the latest health and safety rules, the G200 was fitted as standard with a self-contained, electrically-driven dust extraction system, this being housed within the machine body with its disposable dust bag (a paper filter element) accessible through a hinged cover on the left-hand side.
      The overall working area of the G200 was approximately 960 x 900 mm and the height of the cabinet stand 840 mm. As a bench model the nett weight was 175 kg and on the cabinet stand 250 kg.
      Supplied with each new machine was a pair of centre heads to mount on the table; a universal tooth rest and one blade; two grinding wheels; a wheel-mounting adapter; wheel guards; spanners; an oil can; instruction book and three disposable dust filtration bags.
      A number of accessories were offered, amongst which were a Universal Workhead that could be supplied with plain bearings and a No. 50 International taper - or with ball bearings and a No. 4 Morse taper socket. Surface grinding required a special wheel guard, a magnetic chuck, a 150 x 13 mm grinding wheel and a wheel-holding extension piece. For cylindrical grinding a motorised drive arrangement with guard and belt to fit the No. 4 Morse taper wheel head was available - while smaller items listed included an indexing attachment, end-mill adapter bushes, a diamond dressing tool block for use on the magnetic chuck, a diamond dressing tool (0.5 carat), a ring-scroll 3-jaw self-centring chuck for use on the No. 4 Morse taper head only, a clearance setting gauge, a micro-adjustable finger, a side and a face cutter arbor (4 Morse fitting) and various mandrels to hold cutters.


      Surface grinding using the maker's supplied magnetic chuck


      Regasing a slitting saw located using a side-and face-cutter arbor
      mounted in the Universal workhead of the No. 4 Morse taper type

      Grinding the periphery of a side and face cutter guided by use of the clearance-angle setting gauge

      Grinding a 45?lead on a reamer mounted between centres

      Cylindrical grinding: the universal workhead, fitted with the motorising attachment

      The No. 50 International taper workhead being used to hold a special boring tool


      A Manual is available for the Boxford G200

      Boxford "Union" G200
      Tool & Cutter Grinder

      email: tony@lathes.co.uk
      Home   Machine Tool Archive   Machine-tools Sale & Wanted
      Machine Tool Manuals   Catalogues   Belts   Books   Accessories




      ǮֻϷ