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Title: |
1900 Article-William Sellers & Co., 12 Foot Table, Vertical Boring & Turning Mill |
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Source: |
English & American Lathes, 1900 pg 118 |
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Insert Date: |
12/19/2012 12:49:35 PM |
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Fig. 216 illustrates a vertical lathe, or "vertical boring and turning mill," by Messrs. William Sellers & Co. The semi-parabolic form of the verticals is similar to that adopted in American planing machines. These verticals are bolted to the sides of the bed, and rest upon it also. The bed is made square, to permit of the use of a vertical boring-bar for large cylinders. There is a centre-step adjustable from the side. The saddle is elevated by power through a screw of quick-pitch, and bevel-gears. The tool-slides are capable of angular movement, from the vertical to the horizontal on each side of the centre, and their weight is counterbalanced by the chains and counterweights. The 12 ft. machine shown in the figure is a type of the larger machines of this class made by Messrs. Sellers, from 5 ft. to 1(3 ft. being the range in standard sizes. By the curving of the cross-head, the tool-slides and saddle are kept well back. The machine is triple-geared, with fifteen changes of feed, and a short shearing-pin of hard steel is provided in hardened bushings in the driving - train, which will yield in case of excessive load. The feeds are in two series, varying from .01 in. to .32 in. in the slow, and from "05 in. to 1¼ in. per turn of table in the fast series. Roughing cuts can therefore be made with the fine, and finishing cuts with broad feeds, thus minimizing the wear of the finishing-tool. |
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1900 William Sellers & Co., 12 Foot Table, Vertical Boring & Turning Mill
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