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US Patent: 241,879
Gear Wheel Cutter
Edwin L. Parsons - Providence, RI

USPTO Classifications:

Tool Categories:
metalworking machines : milling machines : milling machine cutters

Brown & Sharpe Mfg. Co. - Providence, RI

Brown & Sharpe Mfg. Co. - Providence, RI

John E. Hall
Samuel Darling
George H. Smith

Patent Dates:
Applied: Mar. 23, 1881
Granted: May 24, 1881

Patent Pictures:
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"Vintage Machinery" entry for Brown & Sharpe Mfg. Co.

The object of my invention is to set the cutter in the gear-cutting machine central with the spindle upon which the blank is held; and it consists in making a small line about two one-thousandths of an inch in width, (0.002,) more or less, in the center of the peripherical contour of one or more teeth of the cutter, transverse with its axis; or a conical or some other form of groove or mark may be used instead of a small line. Heretofore the eye has been the principal guide in seating gear-wheel cutters. The points of the cutter-teeth being rounding, the center cannot be found with a graduated rule or dividers, and it would be too difficult and expensive, if practicable, to make an instrument to fit and accompany each size cutter to be used as a guide in setting it. It is well known that there is a great difference in the natural faculty of mechanics for doing such work by the eye. Some can work quite accurately, while others cannot depend upon their eye for anything accurate.


A gear-wheel cutter having a line in the center of the peripherical contour of one or more of its teeth as a guide in setting the cutter central in the gear-cutting machine.

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