The first move in a G41 G42 should be an initial move to pick up the Offset and should not be part of the machining process, the move should be greater that the radius of the tool. The plane (X,Y) G17 is usually implied, and does not have to be stated. Older controls required a I or J value to indicate the axis offset direction of the first cut. It look like in your case the offset is not being picked up, do you have the right offset in the D4 value? What is the controller?
Al
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CNC, Mechatronics Integration and Machine Design.
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E. |