mr lost step came by?

[spalm]

Hmmm, kind of a stumper with out some more info. Have you tried simple squares and circles and what not? If it always comes back to the same place as it started, maybe just a lot of flex?

For free, you could generate some simple test shapes with SpiroCNC.

Just download it and upzip it.

Steve

[posix]

thanks spalm I'll try that today. but now I'm suspecting flex in combination with misalignment of the workpiece piece because yesterday I "surfaced" my work bed and it went ok but I was only taking off 0.3mm a pass. the amount of sawdust it created (not woodchips), now I'm contemplating starting up an MDF factory