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US Patent: 1,989,651
Method of finishing gears
Patentee:
Robert S. Drummond (exact or similar names) - Detroit, MI

USPTO Classifications:
451/114, 451/47

Tool Categories:
metalworking machines : gear making machines
metalworking machines : grinders : lapping machines

Assignees:
None

Manufacturer:
National Broach & Machine Co., Inc. - Detroit, MI

Witnesses:
Unknown

Patent Dates:
Applied: Apr. 11, 1932
Granted: Jan. 29, 1935

Patent Pictures:
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Report data errors or omissions to steward Jeff Joslin
Vintage Machinery entry for National Broach & Machine Co.
Description:
This patent number was seen in a brochure from National Broach & Machine Co., Inc., of Detroit.

The usual process of finishing gears involves rotating a pair of matching gears with abrasive paste on the mating surfaces, a process that causes uneven material removal as the amount of relative motion is proportional to the distance from the pitch circle. The modified process uses a special cast-iron mating lap that moves transversely to the usual direction of motion of the gear teeth.

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