Question

The maximum depth of damaged layer is how many times that of average surface roughness?

(a) 1.5 time

(b) 2 times

(c) 2.5 times

(d) 3 times

I had been asked this question by my college director while I was bunking the class.

The query is from EDM-Surface Integrity topic in section Thermal Processes of Advanced Machining

Answer 1

Right option is (c) 2.5 times

The explanation is: Depth of damaged layer is two and half times the average surface roughness value.