The milling passes do not coincide!

[CarecaIII]

Hello,


I'm trying my new cnc 6040, chinacnczone usb https://www.aliexpress.com/item/CNC-...311.0.0.Ja6ib1 and today I made an incision that requires two passes due to the depth of 6 mm.
Two simple circles the largest of which is 30cm in diameter.


The smallest did it without problems, while the CNN at 30% of the second pass, stops for a second and then starts off, respect to the first, the second pass by few millimeters .


The circle came bad as can be seen in the photos.
I had this problem the only other time that the cnc did 2 passes.


Depends on what?? How to solve the problem?


Thank you.





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M30

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[RCaffin]

Never mind the program. Your problem is either backlash in the drive system, slipping in the drive coupling, or overloaded steppers. It's mechanical.

Cheers
Roger

[Sterob]

Never mind the program. Your problem is either backlash in the drive system, slipping in the drive coupling, or overloaded steppers. It's mechanical.

Cheers
Roger

I agree.Check all your couplings are tight.
Try redoing the job on some scrap, but slow down the feed rate. See if it still happens.

After that , do what I suggested in my PM: wind all the axis by hand to see if you can feel any tight spots or higher loads.
That will take you a while....
Steve

[Kev Brook]

Hi there, are you using Mach 3 software, if you are have a look at my blog, and go to the "My Mach 3 Set-up" tab and copy ALL the screenshots on that page. This will hopefully solve your problem

https://the-cnc.blogspot.co.uk/p/my-mach3-settings.html

All the best
Kev