Publisher's Synopsis
Excerpt from Cutting Tests With Cemented Tungsten Carbide Lathe Tools
A 36-inch heavy-duty, engine lathe, driven by a 40 h. P. 220 volt d. C. Shunt motor, was selected (see fig. A link belt chain was used to insure a positive drive. Accurate speed control of the work piece was secured by using the several gearing ratios of the lathe and by changing the speed of the motor with a variable resistance in the field circuit. Experiments showed that it was necessary to increase the rate of speed of the motor in order to prevent excessive slowing down or stalling under heavy loads.
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