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| Q. |
Which motion of tool is used for machining spherical surfaces in Electro discharge machining? |
| A. | oscillatory |
| B. | vibratory |
| C. | rotary |
| D. | all of the mentioned |
| Answer» C. rotary | |
| Explanation: the rotary motion tool is used for machining spherical surfaces of conducting ceramic materials in edm. | |
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