For a Binns & Berry lathe this 1940s to 1950s 11.5" centre height by 73" inches between centres lathe was, for its capacity, a comparatively "light" machine with a basic specification - it was loosley based on the "SAR" 9.5 inch model but with a flat instead of V bed, an increased centre height and an older-pattern apron.
The lathe was available with two headstocks : all geared or flat-belt (cone) drive - though it is difficult to believe that many of the latter were sold. The geared headstock had nine speeds, from 22.5 to 490 rpm, with the 2.5-inch bore main shaft in ground, high-tensile steel and supported on Timken taper roller bearing; the gears and other shafts were in carbon steel with the latter ground all over and supported in ball or roller bearings. No oil pump or filtration system was fitted to the headstock - light most medium-duty lathes of the time oil was circulated by the splashing action of the gears as they revolved.
The 5 hp electric motor was mounted on an adjustable hinged plate fastened to the headstock-end bed foot and drove, through multiple V belts, into a Taylor multi-plate clutch; it is suspected that the option of a wide, flat-belt drive to the input clutch was also offered. The pulley into which the clutch was fitted benefited from a supporting arm to reduce the bending forces from the drive belts.
Nearly 12.5 inches wide, but only 9.5 inches deep, the bed fitted with both a permanent half gap and a demountable bridge section which, when removed, allowed material up to 13 inches thick and 38 inches in diameter to be turned on the faceplate.
There was no screwcutting gearbox, just a 3-speed translation box on the end of the 1.75-inch diameter leadscrew which gave three sliding and surfacing speeds for each setting of the changewheels. A separate power shaft was fitted, coupled to the 3-speed box, which operated, via a Colchester-like lift and slide lever on the apron, the power sliding and surfacing feeds.The tailstock was without a proper built-in, over-centre, locking device - not even a captive spanner was provided - and the expense of a handwheel was saved by using by four ball-ended rods.
Standard equipment when new consisted of: a small faceplate, catchplate, two centres, a set of screwcutting changewheels and a screwcutting chart, travelling steady, spanners, suds pump together with distribution equipment and a steel chip tray, and an electric motor with its associated control gear.