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I've got everything up and running now. However when making the first parts it became clear that the belt covers I had neglected to make during the build process were a must so I've made covers for both the X and Y-axis belts now.

I used aluminum extrusions as the base for both covers with end plates made from billet aluminum.

Here is the Y-axis belt cover being made.





Here is how it looks installed on the machine.





 

I don't know if home-to-index can ever work if you are not actually driving the encoder A and B phases. (though I suppose index-enable still operates as a latch, but this seems wasteful of CPU resources, if the encoder counter has nothing to count)

There are diagrams here that try to explain the sequence: linuxcnc.org/docs/stable/html/config/ini-homing.html

But if you want the real details about what is happening in the code, then the homing state machine is fairly comprehensible: github.com/LinuxCNC/linuxcnc/blob/master...motion/homing.c#L329

made some progress

I hope get it working soon


 

Take a look at:
github.com/multigcs/viaconstructor/

it runs on Lin/Mac/Win and is perfect for 2D

i recently started a conversion on an old(ish) tos f2vcnc. but now i got the servo working the motors are jittering when standing still.. at the same frequntie and amplitude. almost like its overshooting its position goal. i have tried pid tuning but nothong takes the jitter away anyone nows what the problm might be? i will upload some pictures later. the drives are baumuller bus3. the picture is of when i was still building it up its all conected now.

Seems quite expensive for what it is on my side of the world. I would rather buy an industrial wireless pendant/MPG for similar money.

Can someone tell me where the problem could be with the explanations I gave and what should I check?

Thank you very much, everything is going great. Both cards were immediately recognized, as was the 7i70 attached to the 7i74.

You saved me.

0.1% voltage ripple is not of any significance for spindle control.

Even 1% will probably be filtered to much less
by the speed control input circuitry.


 

I'm sorry I failed to state my concern clearly. My concern is not how fast the Spindle turns but whether the fluctuation in voltage will adversely affect the electronics in it.

Thanks again for all your help!

Even a few % variation in spindle speed is not of much concern.

Sorry for the delay, life got in the way.

Long story short test with a DVM were positive, could not test spindle due to the late hour.  At "m3 s25000" I am putting out between 9.98v and 9.99v, I hope the fluttering does not effect the Spindle performance.
 
I ended up with:
OUTPUT_SCALE = 12.27V/10V * 25000 = 30675

The issue is the power supply, currently I have one PSU that supplies both +-5v, +12v, the other PSU I have is 48v for Steppers.  the issue is you can only adjust the 5v side, the 12v is only "approximately 12v".

From the manufacture's documents:

Accurate voltage regulation is not guaranteed if the load does not draw the minimum current.

Looking at the block diagram the reason becomes clear: only Channel 1 (5V) is regulated via a feedback loop. Channel 2 (12V) is open loop and unregulated.So you have to adjust the 5V output with the potentiometer while your intended load is drawing its usual current... and you will get "approximately 12V" on the other output.Also the 12V output will fluctuate depending on current draw on the 5V output.

Of course you don't find these things out until you go digging.

The 12v side does fluctuate between 12.26v and 12.27v, I used the latter in your formula.

There may be a separate 12v PSU in my future, if I can make space in the controller box, which is currently packed.  Should have started with a bigger chassis, but I choose to use an old PC case.

Thanks for all the help, on to the next issue and I will have to test Spindle in daylight hours.


 

Thank you, I will try that now!

spumco wrote:

Having said that, the PSU (with resistor) has been in (mostly) daily service with no issues.

[/quote]
I have an older PC PSU with resistor (well 12V/55W cal bulb connected to 5V) powering a nearby gas station LED sign, all 420W of it, for over 14 years.
New ones do not need that, they control the 12V strictly.

For a moment there i thought is said SteamDeck !
Enter the HMI users in droves now...