Project ForgeManufacturing Engineering
Machining Processes
GATE 2009
Hard
Minimum shear strain in orthogonal turning with a cutting tool of zero rake angle is
- A0.0
- B0.5
- C1.0
- 2.0
Explanation
Shear strain γ=cotφ+tan(φ-α). With α=0, γ=cotφ+tanφ, which is minimized (dγ/dφ=0 ⟹ tan²φ=1) at φ=45°, giving γmin=cot45°+tan45°=1+1=2.
Source: GATE ME 2009 (2009)
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