I've been using my CNC router for a few years successfully now and have just replaced chains driving X and Y with ballscrews. I now have A Slaved to X with 2 motors & 2 ballscrews driving the X axis and another ballscrew driving Y.
It seems to function reasonably OK
EXCEPT
that when I crank the feed speed up rather than completing one line of G code before starting the next line it commences the following line early.
So for instance - where previously 3 lines of code gave me a straight cut in the Y direction followed by a CCW quarter arc and a straight cut in the X direction - but now before the first straight cut is completed the CCW arc starts (early) before the second cut in the X direction commences. I end up with an ugly big eliptical curve where there should be a neat little arc in the corner.
What's going on ?