VSD-E, Dual DC. Resolution issue


#1

I’m running two dc servos on one VSD-E drive. X- and Y-axis on my small CNC router.
Do I sacrifice resolution when operating in this mode, as opposed to having two separate drives? I’m getting these jagged edges as seen in the picture. Mach3


#2

Hi! It looks like quite typical cutting tool chatter caused by machining vibrations. Is there way to identify whether it is the case, or if it really originates from the drive?


#3

At least the VSD-E DualDC mode should not have such resolution compromise. Both axis are independently controlled at 2500 Hz real-time system, just like the drive does in single axis mode.


#4

Hi Tero, and thank you for your response!
Well, the ”imperfections” seen in the picture are 100% reproduceable. The small pocket was cut in just 0.5mm depth increments, and for each depth it follows the exact same jagged pattern. At least it’s good to know that it’s not a drive resolution issue.
This g-code is from Fusion 360, but I’ve tried other software with the same result.
I have ballscrews with a bit high pitch, 10mm, and direct belt drive. 1 motor revolution is 10mm travel. Not the best setup…

Well, thank you for your interest in this. Any help appreciated!
/Pär


#5

Ah, that’s interesting. I hope you find the source of it :slight_smile: