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Active tool violates programmed contour

? maybe not far enough away and when tool radius comp turned on it moves tool into programed line / arc. or its already into cut line/arc and tool comp moves it out
many cnc have parameter setting that alarms if this can happen usually stops before as look ahead sees the problem and cnc alarms.
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that is it wants you start away from line arc go into line arc then when done move away from line /arc
 
It could be that your contour has an inside arc that is smaller than the tool after the cutter comp is applied.
 








 
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