US Patent: 1,989,651 - Method of finishing gears


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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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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.