Question

It is difficult to machine inner radii smaller than __________ and outer radii less than ________ in ECM.

(a) 0.1 mm, 0.2 mm

(b) 0.5 mm, 0.8 mm

(c) 0.8 mm, 0.5 mm

(d) 0.2 mm, 0.1 mm

I had been asked this question at a job interview.

My doubt stems from ECM-Process Characteristics in portion Electrochemical Processes of Advanced Machining

Answer 1

Correct option is (c) 0.8 mm, 0.5 mm

To elaborate: It is difficult to machine inner radii < 0.8mm and outer radii < 0.5mm.