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That did the trick, I am up and running. Not sure I would've ever figured that out.

PCW wrote:

Since Preempt-RT and RTAI are about equally bad,
I would more expect an issue with the BIOs, power
management etc.

 

I agree, but the fact there are still RT settings active, granted another chance.

An older version of the official ISO had such issues, so if still suing that it would be very good to upgrade to 2.9.2 ISO.
That does imply formatting the drive so do make a backup of the config on a USB.
In the meantime:
forum.linuxcnc.org/38-general-linuxcnc-q...little-issues#226480

I talked to Peter at Mesa today about a problem I am having Linux Debian CNC.
He thought there may be a bug in the version I am running. 
He thinks it is making too many icons in the background so I can't open up any of my apps.
On the top panel is full of connection icons. I always thought that was strange, but everything worked fine until lately.
Now none of the icon work.
Has anyone heard of this?
Thanks
DB    

Right now I'm using these two methods for homing. I have a custom homing process, compiled with homecomp and activates the internal homing of the drives. When the homing is done, I turn off (comment out) from the hal and ini and using just HOME_ABSOLUTE_ENCODER = 2, so no movement on axis.
But still have to solve the jogging problem, becouse before axes are homed, sill allowed to jog the machine out of softlimits. Unfortunately the soflimist are not working while unhomed.

This method is not so comfortable, but working. I'm still looking for better homing solution.

Since Preempt-RT and RTAI are about equally bad,
I would more expect an issue with the BIOs, power
management etc.
 

Well, it turned out that even the most advanced MoveIT can't handle circular interpolation on its own. Need to write the math yourself. Tomorrow, I will try to write the math myself + Ruckig, with the only difference being that I will use complex numbers.
P.S. There was a scientist named Steinmetz who studied alternating current and used complex numbers instead of trigonometry in his manuscripts, which earned him the title of academician.

Thanks a lot, encoder works. Encoder had wrong configuration because output signal level was TTL instead of RS422.
Also works with my 7i95.

Hmmmmm....
I think it is time to do a fresh install from the 2.9.2 ISO and just installing the RTAI kernel and corresponding LinuxCNC.
You can probably install the kernel and LinuxCNC by just removing the existing LinuxCNC-uspace and installing with
sudo apt install linuxcnc

work perfectly, thank you

I am not in the shop now, but in short, the "pressure" motor is
-a 3 phase BLDC motors with it's own electronic controller taken out of the old photocopiers,
-there are many versions and sizes of them,
-form 5 to 10 pins,
-all signaling is sinking type or "active low", meaning connect to ground to activate
-all have the pinout printed on the board,
-older ones are pure PWM while new ones require also a clock signal,
-some are single direction while some are bidirectional,
-and most of them can be easily used for this purpose/machine,
--The PWM ones require 5V, 12-24V and an inverted PWM signal
--The ones requiring clock signal have a self check feature, so mostly work with only 12-24V supply and one of the pins tied to ground, this pin will spin the motor for about 2 second and stop, and has to be disconnected and reconnected to spin again. This pin is used as inverted PWM but scaling must be set to about max 85-95% PWM to keep the controller from tripping and stopping the motor after 2 seconds.
--for inverting the PWM pin i use a single 220 OHm resistor and a single transistor, any NPN transistor works, resistor connected between base of transistor and PWM output from PC or Mesa board.
-
hackaday.io/project/5236-savin-c2020-teardown

@Rosalyk,

And I wonder why this planner is needed at all if I still have to calculate the circle myself.
Yes, that's work of the planner. It should at least work with lines & arcs.

 

Hello everyone,

thank you very much for your continued help
In the next step I would like to try to set up the RTAI kernel.
Is the following procedure correct?
1. install the "normal" Linux CNC from the homeage under Download
2. download the RTAI kernel at linuxcnc.org/downloads/ at the bottom of the page
3. open a console in the download folder
4. install
sudo apt install ./rtai-modules-5.4.258_5.3.3-linuxcnc-delta_amd64.deb
sudo apt install ./linux-image-5.4.258-rtai-amd64_5.4.258-rtai-amd64-2_amd64.deb
5. restart
6. check if successful
Open console
uname -a

edit

Unfortunately, it didn't work out that way.
Are the header files missing?
It worked but i had to select the kernel in bootmenu
 
still bad

how can i check which linux cnc version i use? as i understood it should be the rtai?

@Andrew,

Nice work!

With scurve jogging you can jog faster because you can use higher acc profile. But its problably also
more dangerous jogging at such high speeds.

For a servo driven machine with a lot off mass, scurve jogging will be a used more often as it reduces
machine shocks, cq inertia.

But indeed if you jog normal speeds, trapezium jogging is fine, and in practical sence, it feels
more direct.

Hmm, it looks like this is coming to zero velocity and acceleration at the end of each segment instead of getting up to the highest velocity the segment can get to, and the next segment starting from that velocity.
Ahh ok.

I modified the example to do 100 x 1 inch segments without stopping in between.
It works ok.

I was checking here when it happened so i was left staring at a white page with very small letters at the top left!
Thank you.