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Try installing from the official ISO just to check: www.linuxcnc.org/iso/linuxcnc_2.9.4-amd64.hybrid.iso

I would make a couple changes in the ini file

OUTPUT_SCALE = 4500

(4500 is 10V/8V * 3600)

And initially I would try open loop
which means P,I,D = 0 and FF0=1

(FF0 should always be 1 regardless
of other PID parameters in a velocity-in/velocity-out
PID control loop like this spindle control )

Hallo was gibt es für die Mesa 7i96s für Erweiterungs   Carden,
Ich bräuchte 9 Ausgänge Für Spindel, Steckdosen (relay),
Pneumatic Ventile  und Zusatzgeräte.

mfg
Hilton
 

Maybe switching to stepper motors would be the best option.
I'm no expert on the subject.

I can see min and max around 70 us. I do have this numbers all the time with a lot of lenovo thinkcentres tinys (m73, m93, m710q etc.) without having troubles.

As long as you do not have spikes in the range of ms (realtek network issues) or added delays like the intel network delays everthing is fine. As long as you are happy with 1 ms servo period of course. Ethercat runs in the servothread, so 1 ms is totally ok.

I always make a plot with the hal scope of the hm read time (if we are talking about mesa cards and added ethercat) to visually see everything. One can see network times and jitter on the fly while doing things (gears, surfing, intel nic delay playaround etc.). Just keep in mind that you see cpu ticks and you have to devide the numbers (100k to 400k range base and peaks little higher caused by jitter) by the cpu tact.

Spindle Speed Control.
Now I have the spindle encoder in place, I set up a PYVCP read out for actual spindle speed, which agrees precisely with a handheld rev counter. Even registers  negative in reverse. so I believe the encoder is working ok in quadrature.
Problem is that I now see that the commanded speed and actual speed are way out, at s2000 I am seeing almost 3000rpm.
(The spindle speed override is at 100% in the GUI)

My motor has max speed of 3600 and the VFD outputs max spindle rpm of 3600 at 8 volts. Increased volts are ignored.
I've checked the relationship between rpm and volts between 0.24V(350rpm) and max speed, and it is linear.
I have tried changing the ini file [Spindle_0] OUTPUT_SCALE and this helps, but then the slower speeds are shifted.

So I think its clear the controller feedback isn't functioning, and I'm failing to see why.
I don't think I need super dooper speed accuracy, but I do want to be able to rigid tap.

Would an expert please cast their eyes over my attached config files and point out where I am being stupid 
Thank you.


 

By experimentation, the Y and X offsets can be entered pressing tool touch off with the wrong axis selected. On a 3 axis mill, as far as I can tell numbers in these columns are ignored.

I just added file load buttons for frequently used files like probe routines so the path shows up in the plotter before you run the routine.

Also don't forget we have a IRC channel #flex_dev on Libera.Chat.

Flex GUI just keeps getting better and better and more flexible.

JT

Move the motors by hand while LinuxCNC is running but not enabled, do the numbers on screen (Gremlin) change?

if you have two (or more ) Tangnano, you can try it, you need the 'dev' branch and
2 free pins on each tangnano (RX / TX).
For short distance, you connect this pins direct (RX<->TX) or using RS485/RS422 converter for long distance.

Rod, he has huge excursions on both sides of the graph, those are not shown unless using --show, and those are the ones causing latency errors and link drop.

Look forward to seeing how that goes, Tang Nano's are about 30 bucks AUD, two of them are still cheaper than any FPGA with a similar total pincount. I'm being selfish but that also means I stick with the same FPGA hardware for every machine I can possibly imagine making. 

Let me know if I can help with testing, I'm currently retrofitting my three machines to closed loop to the controller, so there's room for some hardware experimentation. 

A broader opportunity could be to try and get involved in plant automation. This will get you using a lot of fieldbus technology like ethercat which is transferrable to CNC machines which are only a very small subset of this automation industry. 

Removing the Wifi board is probably good for latency.
The DKMS driver can usually be installed with 

sudo apt install r8168-dkms
but you do need to have non-free in the apt sources. This is included in the Linuxcnc ISO

Seems the card uses a R8168 interface. The R8168 requires a DKMS driver to get acceptable RT  performance. Not sure how that goes with a Pi. I would not use it for ethercat but would be fine for general network use.