High-speed spindle beats out belt. (Precise Corp. variable-frequency spindle used by RS Precision Industries Inc.)

Tooling & Production | April 1, 1991 | Copyright

The challenge for RS Precision Industries Inc, Long Island, NY, was to grind semicircular ball tracks of case-hardened bearing steel to tolerances of [+ or -]0.0004" and parallelism of 0.000 080". A fine finish without minute waviness or chatter was a must. A belt-driven attachment to their Brown & Sharpe surface grinder proved the validity of the concept of using a small-diameter abrasive wheel, but too much spindle power was lost and the auxiliary spindle could not be held perfectly square. This variation and changes in belt tension caused inaccuracies. Also a single-point ...

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