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613,127
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Oct. 25, 1898
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Twist Drill Grinder
|
Wilfred Eames |
Cleveland, OH |
Abstract:
My invention relates to edge-tool-grinding machines, and particularly to that class known as "twist-drill" grinders, in the use of which a drill suitably supported is presented at an angle to the face of a grinding-wheel and while being ground is turned on an inclined pivot for the purpose of removing the stock back of the cutting edge or lip to produce what is called the clearance.
Claim:
In a twist-drill grinder, the combination of a support having an inclined axis of oscillation, and a perforated gage-plate extending laterally therefrom, a plate 14 supported by, and adapted to move longitudinally on, the support, the said plate having an arm passing under the gage-plate and adapted to co-act with the perforation in the gage-plate, and a toolholder pivoted to the plate 14. |