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Title: |
1880 Article-William Sellers & Co., Surface Grinding Machine |
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Source: |
American Machinist, 31 Jan 1880, pg. 2 |
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Insert Date: |
7/7/2015 10:48:09 AM |
Surface-Grinding Machine
The accompanying cut shows the surface grinding machine, referred to by Mr. Wm. Sellers in his address before the "Master Car Builders' Association," at their last meeting.
To insure an exact angle of 60 at the cutting point of the lathe tool, such tools are planed up to an exact size, and clamped in a V block, as is shown in the cut. This V block is then placed on one of the surface grinding machines. The projecting end of the tool is presented to an emery wheel, which revolves below the plate, and the edge of which, by adjustment of the plate, can be made to coincide with the surface of the plate, or be raised above the surface—care having been taken to make the sides of the V block true planes, standing at an angle of 60° one to the other.
The tool ground of such a holder has its end representing the extension of these true surfaces. Proper clearance may be given to the tool in grinding it, by underlying the V block with a wedge plate, made of the clearance angle beyond. The tool, when ground, as above shown, may then be topped off the required amount by planing the V block and tool still on plane in a vertical female V block, so arranged as to let the front of the tool be placed exactly vertical over the plane surface of the grinding machine; and the amount taken off for the flat required can be determined by the vernier gauge exhibited.
This is sufficiently accurate to make two sets of gauges, not hardened, and that interchanged with each other, in every case, at the first trial, and without dressing the threads in any way. |
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1880 William Sellers & Co., Surface Grinding Machine
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