GATE ME 2019 Set 1 — Question 46
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Metrology, CIM & Additive Mfg → Metrology & Inspection → Limits, Fits & Tolerances
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Question
A circular shaft having diameter is manufactured by turning process. A thick coating of TiN is deposited on the shaft. Allowed variation in TiN film thickness is . The minimum hole diameter (in mm) to just provide clearance fit is
Correct answer
(B) 65.12
Solution
1.Determine the maximum diameter of the uncoated shaft: .
2.Determine the maximum thickness of the TiN coating: .
3.The coating is applied to the entire circumference, so the diameter increases by twice the coating thickness. Maximum coated shaft diameter: .
4.To ensure a clearance fit even in the worst-case scenario (largest shaft), the minimum hole diameter must be equal to the maximum coated shaft diameter. Therefore, minimum hole diameter .
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