GATE ME 2017 Set 2 — Question 53
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Metrology, CIM & Additive Mfg → Metrology & Inspection → Gauge Design
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Question
A cylindrical pin of mm diameter is electroplated. Plating thickness is mm. Neglecting the gauge tolerance, the diameter (in mm, up to decimal points accuracy) of the GO ring gauge to inspect the plated pin is
Correct answer
29.03 to 29.03
Solution
A GO ring gauge is used to check the Maximum Material Condition (MMC) of a shaft (pin).Given:
Pin diameter: mm
Plating thickness: mm
Maximum pin diameter mm.
Maximum diameter of plated pin
Maximum diameter of plated pin
Maximum diameter of plated pin mm
Pin diameter: mm
Plating thickness: mm
1.Determine the Maximum Material Condition (MMC) for the pin:
For a pin (external feature), MMC is its maximum diameter.Maximum pin diameter mm.
2.Determine the maximum plating thickness:
Maximum plating thickness mm.3.When a pin is electroplated, the plating adds to the diameter on both sides. Therefore, the total increase in diameter due to plating is .
4.The GO ring gauge must check the maximum possible diameter of the plated pin. This occurs when the original pin is at its maximum diameter and the plating is at its maximum thickness.
Maximum diameter of plated pin Maximum diameter of plated pin
Maximum diameter of plated pin
Maximum diameter of plated pin mm
5.Since gauge tolerance is neglected, the diameter of the GO ring gauge should be equal to the maximum diameter of the plated pin.
GO ring gauge diameter mm.The final answer is Continue learning with Success Tracker
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