Mechanical Engineering - Production Engineering - Discussion

Agree, Thanks @Uday.

I don't know about the correctness of my opinion by the expression for surface roughness is something like this,

H (surface roughness) = (feed rate) /[cot (principal cutting edge angle) + cot (auxiliary cutting edge angle)].

This expression is valid when the nose radius is negligible.

If nose radius has appreciable value then,

H= (feed) /[8x (nose radius) ^2].

So in both, the cases feed rate (option C in the given question) would be the correct answer I think.

C. Feed should be the correct answer.

Feed will be the correct answer.

Surface finish value Ra += F^2 / 8R.
F-feed.
R-nose radius.

So the answer is FEED.

Surface roughness directly proportional to the square of feed rate.

Practical experiment indicates that machining parameter that had the highest influence on surface roughness is the feed rate followed by the cutting speed and the depth of cut.

Here all 3 may be correct like feed, cutting speed, depth of cut while machining practically.

Like by. Reduce the depth of cut, increase speed and reduce feed to get a better finish on job.

It should be feed.

We know that the surface roughness is directly proportional to square of feed.

So in order to achieve specific surface finish we should control on feed instead of cutting velocity. Therefore, Its answer is option C.