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A circular hole of 25 mm diameter and depth of 20 mm is machined by EDM process. The material removal rate (in mm³/min) is expressed as 4 × 104 IT–1.23 where I = 300 A and the melting point of the material, T = 1600° C. The time (in minutes) for machining this hole is (correct to two decimal places).
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- 2.1431 min
- 7.1431 min
- 78.1431 min
- 9.1431 min
Correct Option: B
MRR = 4 × 104 IT– 1.23 mm³/min
Volume required to remove.
| = | D² × L = | 25² × 20 = 9817.477 ,,³ | ||
| 4 | 4 |
MRR = 4 × 104 × I × T– 1.23
= 4 × 104 × 300 × (1600)– 1.23
= 1374.40 mm³/min
| Time required = | = 7.1431 min | |
| 1374.4 |
