NOV 2018

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

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T O D A Y ' S G R I N D I N G T E C H N O L O G Y 4 Today's Grinding Technology By Barry Rogers Although grinding is often thought of as a secondary finishing operation, many industries see grinding as the primary method to achieve the accuracy and surface finish for their applications. Grinding is an abrasive machining process capable of achieving tolerances and surface finishes unattainable by any other process. When dimensional accuracy is unobtainable with milling, turning or electrical discharge machining (EDM), or when tolerances below ±0.0002 inch are required, grinding steps in. Grinding can repeatedly deliver accuracy as tight as ±0.00003 inch and do so repeatedly and reliably under proper conditions. Only honing can produce bore sizing tolerances below that which grinding can deliver. Automotive, aerospace, medical, machine tools, die/mold, energy, tooling and general products are but a few industries that utilize grinding daily. The type of grinding machines available in the market vary by design, based upon the specific parts or components being produced. Machine types include surface grinders, cylindrical, tool and cutter grinders, thread, gear, and cam and crankshaft grinders. Grinding machines can be further divided by the type of grinding they perform, such as surface, form, ID, OD, thread, plunge, centerless and through- feed grinding. Although manually operated toolroom grinders are still available, full CNC machines are now the norm, largely because of their high productivity and capability for unattended operation. In addition to high accuracy, surface finish is a primary reason for using grinding. Typically,

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