NOV 2018

Techspex provides metalworkers free research and analysis tools to help them find the right machine for their job.

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Page 8 of 23 | The Machine Tool Search Engine 7 constructed from granite or special epoxies to minimize thermal expansion and vibration. Any vibration in the machine will directly affect the surface finish of the part. Naturally, grinding wheels create friction, which in turn creates heat. Heat from the workpiece may be transferred to the machine. Grinding heads, motors, drives, tailstocks, electronics and other moving components also create heat, which can influence the accuracy of the machine. The latest machine designs provide stability and consistent dimensional accuracy by controlling the temperature of the various machine components. By circulating chilled, filtered coolant through the machine's workhead, wheelhead, tailstock, and wheel dresser, each component of the machine is more likely to expand from heat at the same rate. Some machine designs also use fluid-cooled drives to ensure that any thermal growth is consistent throughout the entire machine. The same chillers used in the coolant filtration system also flood the grinding wheel to control the thermal growth during operation. As an added measure, grinders are often placed in a thermally stable, temperature- controlled shop environment. Multi-Spindle Configurations Although most machines are designed with a single-spindle grinding head, universal machines, or what might be called multi- tasking machines, are designed with multiple grinding heads and multiple spindles. Depending on the requirements, machines can be equipped with up to four grinding spindles and a measuring probe. Universal grinding machines provide high- precision machining for internal, external and face grinding of large or small workpieces. Multiple grinding wheels can be used (each with a different form, abrasive grit size or bond) to rough grind, finish grind, and polish—all in one setup. For example, multiple ODs can be ground, then the machine can

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