Hi, It sounds to me like you will run into a problem with G41/G42 when you get the roughing radius offset working like you want. When using G41/G42, if the tool radius (plus any diameter/radius modification for roughing) is not smaller than the programmed radius of the corner LinuxCNC will give you an error code and will not run. Maybe G41.1/G42.1 or G41.2/G42.2 will handle this but I have never used either so I don't know. regards Stuart
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