GATE ME 2017 Set 1 — Question 49
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Manufacturing Processes → CNC & Work Holding → CNC Programming (G & M Codes)
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Question
Circular arc on a part profile is being machined on a vertical CNC milling machine. CNC part program using metric units with absolute dimensions is listed below:The coordinates of the centre of the circular arc are:
N60 G01 X 30 Y 55 Z -5 F50
N70 G02 X 50 Y 35 R 20
N80 G01 Z 5
Correct answer
(D) (30, 35)
Solution
From the CNC program:
Start point
End point
Radius
Interpolation is G02 (Clockwise).The distance between start and end points is .
Since , the arc is a arc. The center must be at distance from both points.
Possible centers are and .
For a clockwise arc from to , the center must be at .
Checking angles from :
Start point is at .
End point is at .
Clockwise movement from to is a arc, which matches (positive denotes arc ).
Start point
End point
Radius
Interpolation is G02 (Clockwise).The distance between start and end points is .
Since , the arc is a arc. The center must be at distance from both points.
Possible centers are and .
For a clockwise arc from to , the center must be at .
Checking angles from :
Start point is at .
End point is at .
Clockwise movement from to is a arc, which matches (positive denotes arc ).
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