Strange preview for circular arc (G2/G3)
29 Jan 2026 18:54 #342165
by Finngineering
Strange preview for circular arc (G2/G3) was created by Finngineering
Hello,
I was planning to bore out a disc yesterday and thought I'd handwrite the code. The circular path would be 105 mm in diameter with the center at G54 X0, Y0, and starting at position X-52.5 Y0. Because of my lack of experience, I wrote is as a small program so I could get a preview. But the preview is not what I expected for the:The arc is started from position X-52.5, Y0.
As you can see in the screenshot, the preview shows a strange linear movement and a counter clockwise helix. But when I run the code, the machine makes a 105 mm circle in the XY plane, just as I wanted. The path from this run is visible as well (the red line). I'm guessing I'm doing something wrong, but what?
I was planning to bore out a disc yesterday and thought I'd handwrite the code. The circular path would be 105 mm in diameter with the center at G54 X0, Y0, and starting at position X-52.5 Y0. Because of my lack of experience, I wrote is as a small program so I could get a preview. But the preview is not what I expected for the:
G2 I52.5 J0 P1As you can see in the screenshot, the preview shows a strange linear movement and a counter clockwise helix. But when I run the code, the machine makes a 105 mm circle in the XY plane, just as I wanted. The path from this run is visible as well (the red line). I'm guessing I'm doing something wrong, but what?
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