Quote Originally Posted by routercnc View Post
You can see that this also has stripes where the roughing stepped down on each pass, even though I did a full depth finishing pass. I checked for play in the Y ballnut and ballscrew mounting bearing and all was well. I pushed and pulled the spindle and all seem OK (well, as stiff as it always was anyway). I'll keep an eye on it as the final few parts need total accuracy !
Isn't your softwood spoilboard the problem? Holding that chunk of metal with only four small woodscrews... Just a thought, I don't have experience with similar setups.

I'm following with interest your nice work!