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Headstock lowered to engage the carriage drive gears
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A view showing the underside of an elevated headstock
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Carriage power-feed drive gears
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A single full-length, hinge-open guard covered the drive belt, carriage-drive gears and backgear
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The 0.5 h.p. , 1500 r.p.m. 1-phase motor was bolted to a pivoted plate. The mechanism was crude: slackening the belt to change speeds required the loosening an Allen screw to allow a push-rod, sitting in a hole bored in the front elevating bar, to be moved upwards allowing the plate to be lifted
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Power feed rates totalled six: 0.09, 0.14, 0.18, 1.0, 1.5 and 2.0 mm per spindle revolution.
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A picture that shows, clearly, the arrangement of the three bed bars- the centre one being hollow to carry the drive shaft - and leadscrew
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The carriage-feed gearbox also contained a lever-operated dog clutch that, once the gear train was in motion, allowed the drive to be flicked into and out of mesh. Note the all-bronze construction of the clutch-operation mechanism
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The end of the leadscrew was fitted with a usefully- large handwheel and micrometer dial. Note the use of bronze for the smallest gear
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3-speed carriage-feed gearbox
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