Question

What is the difference between positive and negative rake angle?

Answer 1

Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work.
There are two rake angles, namely the back rake angle and side rake angle, both of which help to guide chip flow.

Answer 2

a positive rake angle is a top rake angle of less than 90 but negative rake angle is 90 or large