A vertical CNC mill uses metric units and absolute dimensions. The program is: The coordinates of the circular-arc centre are

GATE 2017 ME (ME1) – Question 59

Computer Aided Manufacturing and Automation · CAD/CAM and their integration · 2 marks · Multiple choice

A vertical CNC mill uses metric units and absolute dimensions. The program is:

N60 G01 X30 Y55 Z-5 F50
N70 G02 X50 Y35 R20
N80 G01 Z5

The coordinates of the circular-arc centre are

(30,55)
(50,55)
(50,35)
(30,35)

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Show answer and explanation

Correct answer: (D) (30,35)

Explanation

The arc starts at $(30,55)$ and ends at $(50,35)$ with radius 20. A centre at $(30,35)$ places the start 20 mm directly above and the end 20 mm directly to the right, giving the clockwise quarter-circle required by G02. The other possible centre, $(50,55)$, gives the counterclockwise short arc. Thus D.

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