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Originally built to handle work connected with the timing fuses of large shells, this miniature precision milling machine has always excited the imagination of machine-tool enthusiasts. Although difficult to judge from the pictures, the Derbyshire Micromill was a tiny machine, about the size of a portable typewriter, with equally miniscule movements of its slides: the head could be moved vertically through just 1.73" (44 mm); the cross travel was 1.26" ( 32 mm) and the longitudinal feed 3.15" (80 mm). Because the table travel was so short, only 3.15" (85mm), a lever-operated cam was chosen as the easiest and cheapest way of providing a smooth, sensitive yet positive movement. The cam, in the shape of a sector and turning on the end of a block of metal screwed to left-hand face of the cross slide, carried a slot near its periphery formed in the shape of an arch; fitted closely into this was a lug that extended from the end of the table.
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