UCCNC constant velocity settings

[motogeek]

I was hoping I could get some input from the guys using UCCNC with gantry router machines here. What are most people using for your constant velocity settings? I know this has a lot to do with your specific machine and its design, so I know most will be different. I would like to see if most of these numbers are close to each other when it comes to gantry routers. I will post what I am using shortly when I get back to my work. If you are willing, could you post your CV settings and a short description of your machine, ie, is it a small desktop machine, a monster with a 400 lbs. gantry, etc. I did go over the manual's explanation on how this works, but I can't wrap my head around it not being a super technical type person.

My machine, an old MultiCam MG has a pretty heavy gantry and is working pretty well with the settings I am using (I'll post shortly). But I don't know if those settings are optimal or how to determine if they are optimal. Is there a method maybe, like creating a file with circles and squares, etc. and just checking how the machine responds to different settings? Again, not sure how to determine what is "optimal" for these settings.

Any and all help is greatly appreciated.

[Derek]

I think there are too many variables to give you an answer. My gantry is heavy but is lacking in rigidity so I have to use low acceleration settings anyway. I used a shot glass full of water on the gantry and ran some code to observe the jerk. I set the CV settings for the tolerances I wanted to run. I then kept tweaking my acceleration until it was livable. Probably not perfect but soooooo much better than Mach was.

[ger21]

CV is really just a balance between speed (and smoothness) and accuracy. If you reduce that error tolerances, the machine will be more accurate, but may run slower, and "jerkier". Increase, the tolerances, and the machine will be less accurate, but faster and smoother.
Note that the accuracy issues will really only be in corners, or when there's a change in direction.

As Derek says, acceleration and machine rigidity will play a big role in what you use for your CV settings.

And remember that most of the CV settings are distance settings, so a machine set up for mm's will have different settings than a machine set up in inches.