December 1997 Issue

December 1997

Cover Story

Grinding Spindles Take Grease To Higher Speed

Conventional wisdom has it that grease lubrication is fine for grinding spindles so long as speeds stay fairly low. As speed approaches 10,000 to 15,000 rpm, however, then heat becomes a major problem, leaving little choice but to go to an oil-and-air mist system.

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Features

Featured articles from the December 1997 issue of Modern Machine Shop

Inspection and Measurement

Fully Automatic CMM For Machine Shops

Called the Cordax Discovery, the fully automatic CMM is made to operate on the shop floor near CNC machine tools.

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Manufacturing Molds
Grinding

Manufacturing Molds

CNC surface grinding is a critical component of this shop's systematic approach in the manufacturing of multicavity molds to extremely high tolerances.

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Chucks For Specialty Applications
Workholding

Chucks For Specialty Applications

Sometimes the standard three-jaw chuck isn't the best workholder for a job. Here are some alternative designs and some advice on where to use them.

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What Is Single Point OD Grinding?
Grinding

What Is Single Point OD Grinding?

Two enabling technologies -- superabrasive wheels and high precision servo control -- come together to provide a contour grinding process that resembles an OD turning operation. For many medium volume OD grinding applications, this method may be a means to consolidate several manufacturing steps into a single setup.

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