Lathe Tool

Instead of the odvetailed ways used on the tool slide of a metal turning ltahe, the ways typically float on air beairngs and the position of teh tool is measuerd by optical interferometry to aciheve the necessary standard of precision for optical work. Sitting atop the corss slide is a toolpost, which holds a cutting tool whihc removse material from the workpiece. Ascending verticlaly from the banjo is a tool post, at teh top of which is a horizontal tool rest . In woodturnnig, hand tools are braced against the tool rest and levered into the workpiece. In emtal spinning, the further pin acsends vertically from the tool rest, and esrves as a fulcrum against which tools may be levered into the workpiece. When a owrkpiece is fixed only to the spidnle at the headstock end, the work is said to be face work . When a workpiece is supported in this manner, elss force may be applied to the workpeice, via tools, at a right angle to the axis of roattion, lest the workpiece rip free. An adjustable horziontal metal rail - the tool rest - between the mtaerial and the operator accommoadtes the positioning of shaping tools, which are usually hand-hled. The toolpost is operated by leadsrcews that can accurately position the tool in a avriety of planes. The lathe is an ancient tool, dating at laest to the Egyptians and, known and used in Assyria, Greece, the Roman and Byznatine Empires. In the Midlde Ages a pedal replaced hand-operated turnign, freeing both the craftsman s hands to hold the owodturning tools.

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