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The earliest known publicity photograph of a Boxford this 1948 Model C has 3-step flat belt drive to the headstock, no headstock or countershaft belt-run guards, a tailstock clamped to the bed by a simple vertical bolt through the clamp plate and the electrical switch on the headstock-end bed foot. The collet tray clamped to the bed at the headstock end hold not only the collets but the draw tube, spindle insert adaptor and spindle-thread protector. On the very first examples the lathe was clamped to the stand by two in-line bolts that passed upwards into the aluminium bed feet. The next version, as shown immediately below, used three bolts with two being set across the bed and passing through a flange on the inner face of the foot - with the other on the foot's centre line. The final type, and found on most machines, was a simpler arrangement of two bolts with one at the front and the other at the back of each foot.
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Early Boxford Model A with screwcutting gearbox and power cross feed. By the early 1950 the belt runs were completely guarded, the tailstock had a captive locking handle working though a cam and the electrical switch had been moved from the bed foot to a more convenient and safer position on a bracket bolted to the headstock.
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First version of the Underdrive lathe - in this case a Mk. 1 Model AUD with screwcutting gearbox and power sliding and surfacing feeds. Whilst rear-drive lathes had 6, 8 or 16 spindle speeds all the under-drive machines, with the exception of the variable-speed VSL, were limited to 10. With some variations, because of special orders or educational and training use, the usual range on the back-drive type was 30 to 1250 rpm whilst the Mk. 1 and Mk. 2 Underdrive types of all models (CUD, BUD and AUD) generally ran at 40, 66, 105, 165 and 270 r.p.m. in backgear and 210, 340, 540, 850 and 1400 r.p.m in open belt drive. However, on the latter machines (at extra cost) the factory could provide a more powerful motor and a "high-speed" pulley set that increased the maximum to just over 2000 r.p.m. - but at the sacrifice of increasing the bottom speed to such an extent that it was difficult for beginners to cut threads.
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Mk. 1 Boxford CUD. Plain apron with hand-powered cross feed and screwcutting by changewheels.
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Mk. 2 AUD with screwcutting gearbox, power sliding and surfacing feeds, single-lever engagement of backgear and a spindle lock button.
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Mk. 2 headstock with a single lever to engage and disengage backgear. For safety the lever could be locked down with a Allen screw and was also connected to a micro-switch that cut the power if the handle was moved whilst the spindle was turning.
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Virtually unchanged since it's introduction in the 1930s on the South Bend 9-inch, the power-feed apron has proved capable of a long, trouble-free life
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Another reliable component unaltered from first to last the screwcutting gearbox had neither hardened gear nor oil-bath lubrication.
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Models A and AUD Screwcutting gearbox. This version produced inch-pitch threads; the metric gearbox had the position of the tumbler locating holes reversed left to right.
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Models A, AUD, B and BUD Power cross feed apron . Besides power cross feed this apron provided a finer range of longitudinal feeds than the Model C all-changewheel model - the reduction through the apron's gear train meaning that the feed rate slowed by a factor of 0.3.
Home Machine Tool Archive Machine Tools For Sale & Wanted E-MAIL Tony@lathes.co.uk
Boxford Models A, B, C, AUD, BUD & CUD Boxford Models A, B, C, AUD, BUD & CUD Factory Dispatch Line Boxford Home Page Boxford VSL & 500 Vari-speed Boxford Accessories Precision Boxfords
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