Centroid Community CNC Support Forum

Hi all
I’ve been up and running a couple of weeks now trying out different file types
With relatively good success, but.... I have run into on occasion when doing 3D files or V carve files
when the machine just vibrates to the point of loosening steps and ruining the piece.

I have a router mill 32x45 bed DIY build, Geckos 203v drives, NEMA23 570 steppers, ball screws on all axes XYZ
Acorn board W/Pro Mill v4.12

I have smoothing turned on and have tried both Precision Router & Contouring Router to no avail

Do I need to change a software setting to fix this or is it just bad G code or are my motors to small.
All the code was generated by Vcarve pro 9.515
Line N53030 is where it starts to go south

I took some video of the problem to help explain it better.

Any thoughts or suggestions

Thanks
Todd

https://youtu.be/oxByY4jebTA

Todd,
There have been some posts by other people using some Gecko drivers that had an issue due to the pulse rates they were being driven. You might want to change Acorn parameter 968 to 12. The sets the pulse rate down to 100,000, and see if that has any impact.

Russ

With Your z speed at 15 and your xy at 70 Your z speed is choking up the running. Try putting all 3 at 50 and see what you get. Even when ramping into material, if your z is much lower than xy speeds, it will act strange until it reaches cutting depth.

May be a bad choice on your Geckodrive.
Go to page 4 in this thread and read my communications between Geckodrive and myself on this subject.

viewtopic.php?f=60&t=2774&p=20218&hilit=203V#p20218

Marty

Marty may have the answer with the 203 gecko's, but I have one other thought. That machine looks heavy enough to have nema 34's on it and maybe even some reduction gears and belts. It very well could be that you are asking to much from the little motors.

How fast can you rapid before loosing steps when going straight?

By the way, Nice looking build

Thank guys
Russ I changed the parameter (968 from 0. To 12.) Restarted Centroid but no change.

Ken I tried changing the feeds as you suggested (set all to 50 ipm) but it was a no go, same issue.
I was able to rapid to 300ip before loosing steps X and Y so I have it set to 150 X&Y
300 even 200 was too fast for me on such a short travel. I don’t trust it that much YET lol.
I did do some pre planning build wise for NEMA 34s if need be

Marty I think you may be right, I had to reduce the feed rate to 45% before it stopped loosing steps but it was struggling it seemed to me. At that feed rate it would take forever to do some of the 3D stuff I want to do.

I had been collecting parts off from Ebay and what not for the past few years (6) so the 203s are used.

After reading what Marcus wrote I believe this is the first place to start, see what happens?
If after that I still need bigger motors, the drives will be in place and just add the 34s; if that’s not enough I’ll add gear reduction. And it that’s doesn’t do it I’ll …………………………………………….spend more money.

Thanks
Todd

put some closed loop axis motors on that router and it will fly..fast and smooth!
nema 23 open loop motors are quite small for a 32"x 45" size machine and gutless at speed.

DMM DYN2's have proven themselves cheap, powerful and smooth on several routers i have worked on that machine 3D parts at high speeds all day long.

alternatives are https://www.automationtechnologiesinc.c ... -kl-5080h/

and Clearpath!

Here's the video Todd hope this helps you figure out what is going on.
Dan

https://youtu.be/ZXWKncEI9oc

Well if a picture worth a thousand words......A video must be worth a million

Thanks Dan for taking the time to run the file.
The part when it starts doing the Z up to sharpen the edges is when I ran into trouble.
Especially on tinny moves close together. That's why I thought it might be the code.
So much for that idea

The other thing is you are using gear reduction, don't know if that would make any difference.

Maybe I should just bite the bullet and go Keith's route DMM DNY2s

todd432 wrote: ↑Thu Feb 28, 2019 8:30 pm Well if a picture worth a thousand words......A video must be worth a million

Thanks Dan for taking the time to run the file.
The part when it starts doing the Z up to sharpen the edges is when I ran into trouble.
Especially on tinny moves close together. That's why I thought it might be the code.
So much for that idea

The other thing is you are using gear reduction, don't know if that would make any difference.

Maybe I should just bite the bullet and go Keith's route DMM DNY2s

How are you driving your router? What is your reduction ratio? I understand you really need reduction....