Question

In production of EDM electrodes, typical ultrasonic speeds, in graphite ranges between?

(a) 0.01 – 0.10 cm/min

(b) 0.10 – 0.25 cm/min

(c) 0.25 – 0.40 cm/min

(d) 0.40 – 1.40 cm/min

I had been asked this question during an internship interview.

This intriguing question originated from USM topic in section Mechanical Processes of Advanced Machining

Answer 1

Correct choice is (d) 0.40 – 1.40 cm/min

For explanation I would say: Typical ultrasonic speeds used are between 0.4 – 1.4 cm/min, used in producing EDM electrodes.