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Title: |
1921 Article-St. Louis Machine Tool Co., Floor Stand Grinding & Buffing Machines |
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Source: |
Machinery, V28, Nov 1921, pg. 250 |
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Insert Date: |
6/12/2016 7:57:25 PM |
Among a complete line of grinding and polishing machines lately developed by the St. Louis Machine Tool Co., 932 Loughborough Ave., St. Louis. Mo., are the machines shown in the accompanying illustrations. The machine to the left in Fig. 1 is a grinding machine, while the machine to the right is equipped for polishing. A machine of the same general design but arranged for mounting a grinding wheel on one end of the spindle and a polishing wheel on the other end, is also built. Each machine is driven by belt from a fully enclosed motor of the repulsion start induction run type, either single- or three-phase squirrel-cage. The three phase motor will operate on only three-phase lines at one voltage, while the single-phase motor will operate on a one-, two- or three-phase current and at 110 or 220 volts. A direct-current motor may also be supplied. The wheels on the grinding machine are driven at a surface speed of 5000 feet per minute, and those on the polishing machine, at a surface speed of 7500 feet per minute. These machines are made in a large range of sizes and in stationary and portable types. The weight of the smallest size of portable machine is 170 pounds, and that of the largest, 290 pounds.
The heavy floor-type grinding machine illustrated in Fig. 2 is built in three sizes for which the dimensions of the grinding wheels recommended are 18 by 3 inches, 20 by 3 inches, and 24 by 4 inches, respectively. The arbors are made from 0.40 per cent carbon steel and have coarse-pitch square threads. The machine is driven through a pulley which may be either of a plain or cone type as desired. The bearings are provided with large oil chambers, which are filled and drained through a pipe connection at the back, so arranged as to prevent overflow of oil. The weight of the smallest size of this machine is 700 pounds, and that of the largest, 1000 pounds. |
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1921 St. Louis Machine Tool Co., Floor Stand Grinding & Buffing Machines
1921 St. Louis Machine Tool Co.-Heavy Floor Stand Grinding Machine
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