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| Q. |
Drilling in Ultrasonic Machining is done, by which motion of the tool? |
| A. | only rotation |
| B. | only oscillation |
| C. | oscillation and rotation |
| D. | none of the mentioned |
| Answer» C. oscillation and rotation | |
| Explanation: the process, which uses usm for drilling, is known as rotary ultrasonic machining (rum). | |
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