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Thanks Peter.
At high speed 3500 gets me 3400, but 300rpm ends up with 500
Also I have an 'oddness'
If I call for too big a jump in speed reduction, say from 3500 to 1000, an internal part of the vfd drops out the enable relay that is set by M3. If I drop the speed in smaller steps, this doesn't happen. (Probably one to sort out with a max rate of deceleration later. ) Acceleration from 0 to 3500 is ok.
I think for now I'd like to concentrate on getting the low speed more precise.

langdons wrote:

Consider using Ubuntu's real-time kernel.

ubuntu.com/real-time

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

Is the package 

linuxcnc-uspace-rtai installed?

Why?????
He is using LinuxCNC 2.5 (probably still named EMC2) with RTAI kernel, while you insist on using RT-Preempt. They are not the same, although they mostly do the same thing.
And your package does not exist. There is linuxcnc-uspace and linuxcnc.
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Although i admire your will to help, please refrain from dispensing useless information, it is costing us time and effort to fix them and might cost someone dearly.
At least do some checks before posting.

7i84 wurde OK sein, mit 32 eingange und 16 ausgange.
Werbindung zu Mesa 7i96S nur mit ein LAN cable, sehe die manual.
Da gibst noh
7i70 mit 48 eingang
7i71 und 7i72 mit 48 ausgang
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Das ale kan uber ein bilige BOB gemaht sein, aus die IDC shteckdose im 7i96S, aber total sind 12 ausgange und 5 eingane werfugbar.

What type of PC.

forum.linuxcnc.org/45-espanol

May be helpful.

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.