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email: tony@lathes.co.uk Home Machine Tool Archive Machine-tools Sale & Wanted Machine Tool Manuals Catalogues Belts Books Accessories
Page 41 continued on page 2 Unknown Miniature Precision Backgeared and Screwcutting Lathe Do you recognise it ? If so, please email the author Unknown Lathes Home Page
An object of astounding beauty - with the most delicate of detailing and an wonderfully fine cosmetic finish - this 2-inch centre height by 7-inches between centres miniature backgeared and screwcutting lathe even has a taper-turning attachment. The design reflects some features of toolroom lathe practice with, for example, a front V-bedway with a wide and shallow outer face backed by a steep and short inner; long, equally proportioned saddle wings; an especially deep apron; a particularly stiff spindle with a 3/4" x 16 t.p.i. Nose; a front spindle bearing clamped down by four bolts and a worm-drive tailstock barrel. The range of accessories is also impressive: fixed and travelling steadies, a vertical milling slide with dividing head and a high-speed milling and grinding attachment. Grasped by proper half-nuts, the 16 t.p.i. leadscrew was driven through a tumble-reverse mechanism (always a difficult thing to engineer on a very small lathe) with the likelihood that originally there would have been an automatic disengage to the carriage feed. Even the drive - with the bed bolted directly to the motor and the countershaft cantilevered from the back - is, if not unique, very unusual. Unfortunately this arrangement (with just a single rear-mounted pulley) brings in its wake the likelihood that vibrations from the 1-phase motor (not always the smoothest-running) can pass to the workpiece. Collet size was 0.312" (7.94 mm) with threads of 40 t.p.i x 0.268" - dimensions that match those of American Marshall/Peerless watchmakers' lathes.
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