Need Help!- Strange Circles

[ericntx76]

I was hoping someone could tell me whats going on here. Sometimes when I have a dxf file and load it onto my cnc system I get strange circles that appear in the part file that was converted from dxf. Its strange because when I look at the dxf file there is no circles in it and I dont know where they are comming from. I appreciate any pointers that someone could give ...thanks!

[ger21]

Your IJ mode may be set incorrectly .

[ericntx76]

thanks Ger ill have to look at it ...Im not sure what ij mode means anyways so ill have to look deeper into it

[benjamint76]

I get that from time to time even in IJ mode, so I use this program to check out the g-code 1st.

http://www.cncedit.com/

[jemmyell]

Just out of curiosity, what program made the DXF file and what CAD / CAM program is showing these circles?

I have seen these referred to as 'crop circles' elsewhere and also here on CNCZone. They are usually an artifact of a arc segment being incorrrectly generated.

-James