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Lever-action Tailstock on a Cross-feed Base.
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Half-open Tailstock:
This became a traditional design of Precision Bench Lathe tailstock and was originally intended for light duty, mass-production work. The idea was to have a selection of barrels to hand, each equipped with a different tool, so that a series of operations could be carried out in rapid succession - in effect, a very light-duty, tailstock-mounted capstan unit.
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Lever-action Revolving Spindle Tailstock - intended for deep-hole, high-precision, small-diameter drilling this unit allowed a drill, held in a collet, to be rotated at very high speed by a round-rope drive from an overhead countershaft.
With tiny drills the problem is to attain the correct cutting speed; by rotating the headstock (holding the workpiece) in one direction and the drill in the other - at up to 10,000 rpm - an efficient cutting speed was more easily obtained.
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Lever-action tailstock:
Very fine control is far easier when exerted through the medium of a lever rather than a screw thread. Models were available to fit all sizes of Stark lathes.
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Sliding tailstock:
This light tailstock was intended for very sensitive drilling and reaming operations. The bushings through which the spindle slid were of hardened and ground tool steel and an adjustable stop - which doubled as a steady - was part of the standard specification.
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Three-spindle Tumble Tailstock:
This unit was intended to be employed where two or three tools could be used in succession on light production work. The three spindles, all of the "light sliding type", 6 inches long and fitted with adjustable depth stops, were mounted in a swing frame, pivoted on studs mounted in the base plate; the frame was indexed into each of its three positions by a spring-loaded pawl.
Versions were available for all but the No. 5 lathe.
An earlier version of this unit, which differed in a number of significant ways, can be seen here.
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Fixed Steady with simple hand-set work supports.
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Universal Pump Centre:
A large version of the unit common on watchmakers' lathes. The three jaws could be locked into their slots and the clamps on the top of each slackened to enable work to be removed, and replaced, without loosing the accuracy of the initial setting.
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