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
1 and 2
3 and 4
Correct Option:
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