GATE ME 2014 Set 1 — Question 30
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Manufacturing Processes → CNC & Work Holding → CNC Programming (G & M Codes)
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Question
For machining a rectangular island represented by coordinates P(0,0), Q(100,0), R(100,50) and S(0,50) on a casting using CNC milling machine, an end mill with a diameter of 16 mm is used. The trajectory of the cutter centre to machine the island PQRS is
Correct answer
(A) (-8, -8), (108, -8), (108, 58), (-8, 58), (-8, -8)
Solution
To machine an island (an external feature), the cutter center must be offset outwards from the boundary by the radius of the cutter.
Given: Diameter Radius .
The coordinates of the island are , , , and .
Offsetting each point outwards by :
Given: Diameter Radius .
The coordinates of the island are , , , and .
Offsetting each point outwards by :
- Closing the loop back to start: .
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