Y Chatter

[mlk1950]

Hi, Just learning the art of CNC. Got my machine to where I'm in the testing stages. Haven't tried to carve a piece of wood yet, just simulating to this point. All axis seem to run fairly smooth except the Y. When it gets to a point on the G-code where it's supposed to be cutting in a certain area It seems to chatter ( the best way I can describe it) or vibrate until it takes off on a longer run, then smooths out. Is that resonance or missed steps, or what do you think?

Thank's Mike

[dkirtley]

Is this on a curve or a circle? If so, it might just be taking the small steps until it gets to a straighter portion.

[mlk1950]

Small curves.

Thanks MIke

[jsheerin]

Do you have constant velocity turned on (assuming you're using Mach3)? If not and your curves are a series of small straight lines, that will give pretty clunky motion because the machine starts and stops at the end of each line (iirc).

[mlk1950]

Yes I am using Mach3, and I'm just learning it. I don't know where constant velocity is located, or even if it's rurned on. I looked in motor tuning and didn't see it.
So from what I've gathered from your input, this is nothing to be concerned about?


Update---- I found it in General Config. and it is turned on.

Thank's Mike

[jsheerin]

It's in one of the settings screens - I don't remember off hand which one. If that's the cause of the stuttering it's nothing to be worried about - I'd just turn on CV mode so it will run smoother and faster. But if that's not it, it could be several other things that would be cause for concern.

[jsheerin]

Looks like it's on the general tab. Here's more info:
http://www.cnczone.com/forums/mach_s..._solution.html

[mlk1950]

Originally Posted by jsheerin Looks like it's on the general tab. Here's more info: http://www.cnczone.com/forums/mach_s..._solution.html

Thank's, thats good info. Going to be gone a few days but will give it try when I get back and update on my progress. Man, there sure is alot to learn in this world of CNC.

Later Mike