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If I remember right, linuxcnc doesn't do synchronized motion on rotary axis.
Maybe wrong term but feeds,speeds and acceleration is determined by x,y,z only and the rotary axis will do the best it can. When it can't keep up this in the figure happens.
One usually uses the inverse time feed specification G93, and calculate the time needed for the movement in the CAM post-processor.
There are converters on "the web" that can translate G code to G93.

The only option would be to buy a cnc lathe, which is not a budget option.

Every other option is going to require you to do some wiring.

Even something such as this, github.com/clough42/electronic-leadscrew, will require you to do some wiring. And this is only a solution to screw cutting and doesn't have any cnc capabilities, tho it doesn't connect to a computer.

Once a again another Electronic Lead Screw, www.rocketronics.de/en/els/ no connection to a PC,no cnc capabilities but does other some extra features. Is still a user install, so there is wiring involved, but no connection to a PC. not really a budget solution.

First mistake was using a buck conveter, 2nd I would seem to be not checking the operation of the buck converter prior to connecting everything up. 3rd mistake would have been to triple checking everything.

Simple solution would have been to power the breakout board from a known and working 5v supply or whatever voltage the BoB required.

Hello everyone, 
I am using mesa board 7I76E to control 5 axis cnc with servo motors 
I installed the linuxcnc on a laptop when i run linuxcnc with the mesa board on the laptop everything works well i got some wired interference like loosing Ethernet communication with the board or the mouse pad will be crashed all the time but i was ignore them because they didn't really influence on my project.
After that i installed the same version of linuxcnc on a desktop computer in fact i used the same ssd so it was the same software, the same configuration at this moment the noise issue became more than usually now i lost the communication every 5 min around ana that's a big problem. Do you have an idea what is the exact issues happened to me , how could i decrease those noise 
Thanks in advance 

Well, that never took off. Purchased a used PC with a parallel port breakout board and set everything up with what looked correct. Used a buck converter to power the board and noticed it wouldn’t change the voltage. Powercycled the steppers and breakout board and PC immediately turned off. Left the PC unplugged and the buck converter came to life at 26 volts, immediately blowing the caps in dramatic fashion. Well now with a fried PC and breakout board, I’d like just a ready made solution to power my lathe. I was going for Linuxcnc as I wanted spindle sync and backlash compensation, so if there are any great budget options that are just a ready made solution so I can stop worrying about wiring and flashing boards, that would be fantastic.

made it,
i bricked the board

because the linux version on it was too old i wanted to update, but that went wrong somehow, now i'm trying to compile a new one and get it running again somehow.

it's no fun and very time consuming

unknown wrote:

BSD isn't forgotten, I've run it for years on a router/firewall.

+1
And used it's desktop versions for over 2 years, probably 20 years back.

BSD isn't forgotten, I've run it for years on a router/firewall.

Probably need the drive manual for that...

If it's like a classic motor drive, there will be three nested PID loops:

1. Torque (current) command/feedback --> torque (current) out
2. Velocity command/feedback --> torque out  
3. Position command/feedback --> velocity out

Is there any tuning program available for the drive?





 

tommylight wrote:

langdons wrote:

That means if a PC running Linux happens to break, you can just take out the HDD and plug it into another PC and it will work no fuss, no muss.
Yes, for the last 20 odd years Linux could do that, even through external USB cases and/or CD/DVD rom's.
That is very hard to explain to "PC experts" who used windows only as that never worked, till win10 had that haphazardly implemented and intermittently working about 5% of the time.
"""ntldr not found"""

Linux generally shows info during boot-up, which is useful in-case something goes wrong.

Also, if Linux fails to start for some reason, you can open a terminal, even if you can't start a GUI.

However, with Windows, there's just a useless loading screen, and there's not even any way to tell if Windows is booting up or if the PC is just frozen anymore.

If it freezes, you don't even get to see any error info, you don't have a handy CLI as a fallback.

Then you have to reboot, and somehow press F8(if it happens to work on your specific PC) in the microsecond period and boot into "safe mode", and ughhhhh.....

What about BSD, the forgotten OS?

And you can build a Linux system entirely from source, if you are into that kind of shenanigans.
Boot from a tftp server and run the OS entirely from ram. Or boot from a tftp server and mount the rootfs from a third machine.
A lot of home routers/access points/modems run Linux.

Running a Linux desktop is quite boring and mundane when one realises what Linux is capable of, and what a user can do with it once they read & experiment.

That's correct. I'm going to try to adjust the gain settings and see if I can get this tighter. Any suggestions what settings to look for? Many thanks

As had been suggested before, it looks like the drives themselves need tuning.

Not a firmware issue.

I would not expect motion until you enable the drives.

If there is an analog output issue, it typically shows up as a non-zero
output voltage when the 7I77 is powered.
 

Hi tommy, 

The voltage was the same at both drivers. I have dug a bit deeper and used Halscope and probed 

Joint.0.motor-pos-cmd against hm2_7i95.0.encoder.01.position

For both X and Y, I cut a few circles using arcs, and this is my result. Looks like the motor isn't keeping up with the encoder?

I wasnt sure what /k to use, so I have attached two screenshots, one all even /k and some scaled to fita better curve. This is all new to me so apologies in advance. 

I'm using Step/Dir Servos, I have just temporarily fed the endcoder back to LinuxCNC for testing. 
Im using 1kw ac servos by Litchaun 4NM the machine is a Haas mini mill. any thoughts?