Question:-
Assertion (A): The ratio of cutting force to thrust force is very high in grinding process as compared to other machining processes.
Reason (R): Random orientation and effective negative rake angles of abrasive grains increase the cutting force and adversely affect the cutting action and promote rubbing action.
Option (A)
Both A and Rare true and R is the correct explanation of A
Option (B)
Both A and R are true but R is NOT the correct explanation of A
Option(C)
A is true but R is false
Option(D)
A is false but R is true
Correct Option:
(A)
Question Solution:
Due to large number of cutting edges with random orientation of negative rake angle of abrasive grains increases the cutting force and adversely affect the cutting action which promote rubbing action.
question-answer-faq-8398