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1892 Article-Betts Machine Co., 60 inch Tire Turning Mill |
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American Machinist 04 Feb 1892 pg 1 |
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10/24/2014 9:51:15 PM |
Five-foot Tire Turning Machine.
"We present on this page an illustration of a boring and turning mill modified for the special purpose of turning and boring steel tires for cars and locomotives.
The principle points in which the machine differs from the regular mills made by the same company are that the housings are lower in proportion to the swing, and that the cross-rail is secured to them permanently and has no vertical adjustment. This latter feature, of course, tends toward simplicity of construction and great rigidity, and, in fact, pains have been taken to make the machine as simple and easily managed as possible, and to make all breakable or wearing parts so that they may be easily renewed. The machine can be entirely dismantled without removing it from its foundation.
The machine is driven by a five-stepped cone pulley for a 4" belt, from which twenty different speeds are obtained with one speed to the countershaft, and, as two speeds are usually given to this, the machine can be driven at forty different speeds, so that the maximum speed for any given metal or condition can be obtained. Power is transmitted through cut gears to the table, which is driven by an internal gear near the periphery, which has teeth of peculiar form which have been found to run very well, even when much worn.
The table, which is unusually heavy, is supported upon a steel step when running at the higher speeds and upon an annular bearing near the edge when running slowly upon heavy work.
The heads are adjusted and fed independently, there being six rates of feed, the motion for which is transmitted through gears and screws, giving a positive feed, and one in which all stress is removed from the teeth of the gears, except when they are actually moving the tools. Quick returns are supplied to all motions of the heads and bars.
The bars are of square section, bearing upon flat surfaces which are scraped to a bearing and can be adjusted. They are counterbalanced in such a way that the weights by which it is done are entirely out of the way of the operator.
The uprights are of box section, heavy, and securely fastened to the bed and to the cross-rail. Shafts and all pinions are of steel and the boxes are lined with brass bushings, which can be easily renewed.
The size illustrated, which is of five feet nominal capacity, takes 14" under the rail, has 18" travel of tool bars, a table 60" diameter, and will swing about 68". It weighs 32,000 pounds, and is built by the Betts Machine Company, Wilmington, Del. |
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1892 Betts Machine Co., 60 inch Tire Turning Mill
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