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Title: |
1921 Article-Oesterlein Machine Co., #2 Universal Horizontal Milling Machine |
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Source: |
Machinery, V28, Nov 1921, pg. 249 |
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Insert Date: |
6/12/2016 7:37:23 PM |
The Oesterlein Machine Co., Cincinnati, Ohio, has placed on the market a line of milling machines of the constant speed or all-geared type consisting of six sizes, each of which is made in both plain and universal styles. The No.2 universal machine is here illustrated. The speed mechanism furnishes sixteen geometric speeds through fifteen gears and 1 shaft, in addition to the spindle and pulley shaft. Speed changes are effected by means of “two-position" levers and a “four-position" knob, the latter controlling the selection of four adjacent spindle speeds. All speed changes may be made without stopping the machine.
Each gear is made from a low-carbon forging that is put through annealing, carburizing, and hardening processes and is sand-blasted to remove furnace scale. Automatic lubrication of the machine is effected by a system of three reservoirs; in the first of these, which is located in the top of the column, the fresh oil is poured. This oil seeps through felt and runs down tubing to cavities cast under the main spindle bearings, the intermediate shaft bearings, and the driving pulley. The oil is carried to the spindle bearings by means of wicks that dip into the cavities under the spindle. By this arrangement only fresh oil is admitted to the bearings that are heavily loaded. The oil passing through these bearings overflows into a second reservoir from which it is distributed to the speed gears and minor bearings by splash lubrication. The overflow from the second reservoir passes to the speed-box, which is the third reservoir, this being also oiled by splash lubrication. The capacity of the first reservoir is sufficient to supply the machine for about two months of ordinary service. Provision is made for raising the level of the oil in the last reservoir if the established level should decrease.
The driving pulley on each machine is 14 inches in diameter and runs at the rate of 400 revolutions per minute. A brake designed for stopping the spindle quickly is connected with the belt shifter in such a way that as the belt is partially carried to the loose pulley, the brake is applied to the tight pulley by means of a spring plunger releasing mechanism. The feed box, knee and table are similar to those supplied on the cone type milling machines built by the same concern. |
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