Question:-
Which is the following indicate better mach inability?
1. Smaller shear angle
2. Higher cutting forces
3. Longer tool life
4. Better surface finish
Option (A)
1 and 3
Option (B)
2 and 4
Option(C)
1 and 2
Option(D)
3 and 4
Correct Option:
(D)
Question Solution:
Large shear angle implies Fc will be more
Fc = Fs. (bt1/sinÆ)(cos(b-a)/cos(Æ+b - a)
Fc­ as Ư
Good mach inability indicates good surface finish and integrity, long tool life, low force and power requirement and easy collection of chips that does not interface with the cutting operations
question-answer-faq-3298