GATE ME 2015 Set 3 — Question 55
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Manufacturing Processes → CNC & Work Holding → CNC Programming (G & M Codes)
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Question
In a CNC milling operation, the tool has to machine the circular arc from point to at sequence number 5 of the CNC part program. If the center of the arc is at and the machine has incremental mode of defining position coordinates, the correct tool path command is
Correct answer
(B) N 05 G91 G03 X-10 Y-10 R10
Solution
To machine a circular arc from to with center at :
End point:
Center:
The vector from center to start is .
The vector from center to end is .
Moving from to on a circle is a counter-clockwise (CCW) motion.
The command for CCW circular interpolation is G03.
1.Mode: The question specifies incremental mode, which is G91.
2.Incremental Coordinates:
3.Direction:
Start point: End point:
Center:
The vector from center to start is .
The vector from center to end is .
Moving from to on a circle is a counter-clockwise (CCW) motion.
The command for CCW circular interpolation is G03.
4.Command: Combining these, we get N 05 G91 G03 X-10 Y-10 R10.
Thus, option (B) is correct.Continue learning with Success Tracker
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