Question:-
Assertion (A): Negative rake is usually provided on carbide tipped tools.
Reason (R): Carbide tools are weaker in compression.
Option (A)
Both A & R are true & 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:
(C)
Question Solution:
Carbide tools are weaker in tension than in compression so shank should have sufficient thickness to minimize tensile stresses.
Carbide tipped tools usually have negative rake angle:
1. To increases strength of tool.
2. To decreases temperature rise of tool due to flow of chips.
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