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US Patent: 1,708,491
Method of finishing ball bearings
Carroll R. Alden - Detroit, MI

USPTO Classifications:
29/898.13, 451/114, 451/49, 451/52

Tool Categories:
industrial machines : industrial machine mechanisms : industrial machine bearings
metalworking machines : metalworking machine mechanisms : metalworking machine bearings

Ex-Cell-O Tool & Manufacturing Co. - Detroit, MI

Ex-Cell-O Corp. - Detroit, MI


Patent Dates:
Applied: Jul. 17, 1926
Granted: Apr. 09, 1929

Patent Pictures:
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"Vintage Machinery" entry for Ex-Cell-O Machine Tools, Inc.
Ex-Cell-O made high-speed grinding spindles that required great precision in manufacture. The innovation in this patent involves "running in" the bearings during the manufacturing process as a way of ensuring the balls are the same size and the running-in wear properly accommodated. A watt-meter is used to monitor power draw during the running-in process and the end-pressure is increased over time to keep the wattage roughly constant. The end-pressure mechanism eventually bottoms out, indicating that the bearings are nearly sufficiently worn in. After that, the running-in process is complete when the watt reading drops to a set value. During the running-in process the bearings are filled with a mixture of 20 oz. of jeweler's rouge (finely divided iron oxide) per quart of mineral oil.

This patent was further improved in patent 2,460,472.

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