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Can you plot (with halscope) the C axis commanded and feedback positions?

That would help diagnose the issue.

I do not use RPI but 126000ns is 126us or 0.126ms, so should still be OK for mesa boards.

No not that old. But maybe I lack some general understanding.
1. my raspi4 gets an base thread may jitter of 126 ms (126000 ns), which is supposed to be not usable for linuxCNC ( so why is there an image for that?)
2. or is the mesacard exactly there to address that problem with it's FPGA?

Sorry for the somewhat below rookie-level questions

Do the old PC's have a parallel port on the back side, the violet/pink colored 25 pin one?

ballscrews ar primary because the original threads in brass nuts have quite some deadway. But yes, it is all metal and the swallow tail rails are even adjustable. Plus it is the same model the other guy was using for years.
Only difference so far: He used a setup, where the motor was separated from the machine with a belt transmission and the z-axe was only moving the milling bit.

Also: I thought I might use one of my older PC standing around, but the latency test told me other wise (150ms and above).
Next try raspi4...

Al that seems fine, but, is the machine stiff enough so it justifies ballscrews?
Is that the really small mill with metal ways? That should be OK.

Die 10V muss auf dem FU an Mesa 7i96S gehen, da sind klemme fuhr GND, AI, und +10V an die FU.
Edit:
My bad, missed the part where spindle works, sorry.

Good Afternoon,

I am in need of a 3 axis milling sample program. I am converting my Anilam Crusader M 3 axis mill to LinuxCNC. I use Gibbscam and in order to help me with the post processor they need a sample program that contains gcode that generate lines, circles, tool changes, etc. I sent them a link to the LinuxCNC G Code catalog. Any help is greatly appreciated.

Thank You,
Steve in Indy

I was thinking that 1:1.45 overdrive of the spindle could be an issue, but it just doesn't make sense that it would also misbehave without encoder feedback, when it's just an open loop system.

The motor is rated 5.5kW. It's on the slower side but the torque should be plenty I'd think. I've spent the last night rolling around thinking of this and I'm pretty sure it must be something to do with step scaling, accel values or something like that. Maybe there is too many steps? 10k per revolution and it's causing issues for unknown (to me) reason. I will try to test that next and see if that makes any difference.

Thank you, it was the analog line of the Z axis, it was switched around. Switching it and inverting the output scale from 60 to -60 did the trick.

Now I wonder how it worked in the first place. I think the GND of that connection must have been bad, and when I added the index lines, it got connected.

Hallo, zusammen. Ich bin Anfänger und habe mir gleich bei meiner ersten Fräse (Volksfräse mit Chinaspindel und YL620-A FU an einer Mesa 7i96s) LinuxCNC vorgenommen. Ich kämpfe mich nur langsam Schritt für Schritt vor und würde mich über Unterstützung freuen.
Ich bin jetzt so weit, dass die Fräse per Hand alles macht, was sie machen soll (Fahren in alle Richtungen und auch die Spindel läuft). Wenn ich ein Programm (GCode) ablaufen lassen möchte, bleibt LinuxCNC stehen, wenn ein G1-Code kommt, wenn er also losfräsen soll. Ich gehe davon aus, dass LinuxCNC nun darauf wartet, dass spindle-at-speed signalisiert, dass die Spindel ihre Sollgeschwindigkeit erreicht hat. Und da stehe ich auf dem SChlauch und bitte um eure Hilfe: Laut Anleitung müsste mir der AO-Port des FU die tatsächliche Drehgeschwindigkeit anzeigen (proportional als Spannung 0-10V). Zwischen GND und AO bekomme ich aber keine Spannung, die proportional zur Drehgeschwindigkeit ist. Wenn ich langsam die Geschwindigkeit hochdrehe steigt dort die Spannung leicht an (in Richtung 90mV) und fällt dann sogar wieder ab. Ist also nicht das gewünschte Verhalten. Ich habe P03.18 auf 0 gelassen und P3.19 und P04.00 ebenfalls so gelassen wie es war (100 und 10). Muss ich noch irgendwas machen? Oder hab ich das alles falsch verstanden?
Wenn ich dann ein sinnvolles Signal bekomme: Was genau muss ich dann tun, damit LinuxCNC das als spindle-at-speed annimmt? Ich habe (als Anfänger) bisher nur mit dem Wizard herumgespielt. Wahrscheinlich muss ich in die HAL gehen? Was dort genau wo einstellen? 
Danke für die Unterstützung.
 

That's great news, glad you got it sorted out!

As I'm planning to do live coin minting at some events I attend, I will retrofit a proxon milling thing to make my own coin dies.
Model is this one:
forum.drucktipps3d.de/file-download/12960/
I'm in contact with a nice austrian guy, who has done that before LinuxCNC exists (uses some old DOS software via par port). So the mechanical part is quite proven.
Plan is as follows:
- replace all threads with ballscrews
- a mesa 7i96s (have that from a dead project)
- stepper motor and microstepper driver (from yet another dead project)
- maybe place a 1:6 gear between stepper and ballscrew (this is actually trick from the austrian guy) for higher detail
My main question is about the milling spindle. As I will mill little amounts of material, I was aiming for some small spindle (partially for lower weight to have faster and more precise movements). On the other hand it should have quite high rpm and very good concentricity.

So far I was thinking a AMB 530 FME. At least I couldn't find a lighter one that would serve the purpose.

Please let me know if my plan might generate a working machine or if I have a major f-put in my plan.

Just getting started with Flex; I've never really done a GUI from scratch so I haven't internalized any 'best practices' or anything.

Goal is something like below.  I started fiddling last night but quickly realized I needed some experienced advice on how to organize & lay-out this thing.

Details aren't set in stone now, but I want a GUI with no on-screen controls/jogging on the main page.  Will be used with 15.6" touchscreen 1920x1080p monitor - so I can't cram lots of small stuff in.

Maybe something like:

• Main window
  • Horizontal layout
    • Frame (variable displays top)
      • Vertical layout
        • Stacked widget (left)
        • Frame for stacked widget buttons (right)
    • Frame (fixed displays middle)
      • Vertical layout
        • Frames across for each 'section'
    • Frame (fixed indicators btm)
      • Vertical layout
        • indicators + estop/on btns

Or is there a better way of laying this out that doesn't wind up with me painting myself in to a corner?  I don't like tabs, so no tabbed widgets.

Thx
 

Make a new config and give it a try.
If that does not work:
-make sure the analog wires are properly making contact inside the connectors
-check if analog is correctly wired as reversing polarity of those two wires can cause most of the issues you have