Sorry if this was covered in another thread.

I have a Syil X2 mill and a Mach 3 controller.  I used Bobcad to draw an arc and when I cut it, it has a odd spot at the top of the curve. Do I have play in the system or some other problem?  The lower arc is being cut from right to left and the upper left to right.

Please see attached photo.

Thanks,

Jim.

jimw

backlash ----- first check for loose mecanical connections . after you are satisfied with the connections move on to software adjusting. you can do a search on the forum for backlash and get plenty of info.

bill

Thanks.  I'll give that a try.

That's aluminum. You can clearly tell by looking at the molecular configuration. 

Alum yes, only soft stuff right now.

Worked over the machine and decided mechanically it was as good as it gets and tried the software adjustments to backlash.  Attached is the new piece.  So much better.  Thanks to all.

Jim.

Something to try is oversize balls for your ballscrews.

I have the little Thomsons with 1/8" balls and was able to get .001" overize balls. Took out all of the play.

Longevity of this solution will of course vary by how many hours and how much stress (some folds call it stress, I call it abuse), you put on it.

That's aluminum. You can clearly tell by looking at the molecular configuration. 

True, but you overlooked that the molecules are clearly British, so the material is Aluminium. 

Right well . . carry on . . .