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"did read almost half of the linuxcnc documentation"

That's the issue.

It's there you just need to look.

conv_bit_float will just turn a bit to 0.0 or 1.0

Normally  the way jog increments are selected are with a mux
component, say mux4

man mux4
 

Thank you. Without your incredible help, I would still be searching for how to implement this project. My current CNC machine is a 5axismaker with Mach4 software and Pokeys57U hardware. After reaching out to the vendor, they confirmed it can be converted to run LinuxCNC and suggested I follow this post: forum.linuxcnc.org/24-hal-components/29816-pokeys-ethernet. My first step will be converting the machine to LinuxCNC as well as figuring out LinuxCNC. Then, I'll create a custom HAL to apply external offsets to the original g-code using data from the camera using OpenCV. I feel like I've done adequate research beforehand but the actual implementation is where I will see how difficult this gets. While I'm not as experienced with CNC control, I'm more comfortable with programming but we will see. Hopefully, I can show the completed project as soon as possible  !

I have external push buttons for jog increment and I'm trying for example to update halui.axis.x.increment with the value 0.001
conv_bit_float seems like it should work for this?

It's not obvious how I get the float value of 0.001, assigned to the float value?
Error is postgui.hal:202: Pin '0.001' does not exist

The external button is updating net jog-inc-1 when I push the button (observed in Hal show)
Excerpt from postgui is as follows:

loadrt conv_bit_float count=1
addf conv-bit-float.0 servo-thread

net jog-inc-1 <= arduino.keypad.Jog-Inc-1
net jog-inc-1 => conv-bit-float.0.in
net jog-inc-1f  conv-bit-float.0.out 0.001

You lose bandwidth by going to a lower servo PID rate. If that doesn't
matter because the system you're controlling is slow, there is no price
in going for a lower control speed.

With a sampling rate of 250Hz, you can actually measure up to 125Hz. In reality
the limit is usually between 1/5 and 1/3 that frequency before difference between
a sampled and a time continuous system become apparent.

So with 250Hz you're approximately limited to 50Hz of control
bandwidth. To me that seems terribly low. On my own lathe I have a
resonance at approximately 300Hz. Since I have the servo thread running
at 4500Hz (because that's the maximum rate the encoders I use support)
I was able to eliminate that resonance.

On the other hand, what do you lose when going for a higher sampling
rate? The only thing I can come up with is processor time, but that
seems hardly an issue on a modern PC. And I'm doing this on an RT_PREEMPT
kernel, so it's not even Xenomai or RTAI.

I got the smallest Gravograph machine (UNICA) up and running.
Thanks once again for your input and this amazing forum in general

Now, the larger machines have 1-phase AC motors and a separate speed control PCB that's actually a single-phase frequency converter. So far so good, there's also an encoder and a potentiometer to set speed, BUT:
The potentiometer is 500 kOhm and voltage across the potentiometer is merely 0,22 V.

Is there any way to get this to work with LinuxCNC?

[EDIT]
I'd like to apologize for crashing Hans Peter - HPWs thread.
Would it be better to move my issues to a new topic instead?

Hans Peter, verzeih mir bitte, dass ich mich hier hineingedrängt habe

looks like golang did it. Thanks a lot Scott!!

In fact, it is that exact work that has got me started. A great starting point to build from.

Hi folks,

I'd like to create a new interface and am in need of some help. I'd like to create something like the attached mockup, and overall it is fairly ambitious. I've installed and messed around a bit with LinuxCNC, a few existing interfaces, and Qt Designer, but haven't been able to completely figure it out. I have some programming experience in C# but not in Linux. Trying to sort out all the pieces of LinuxCNC is not easy, so I'd be happy to pay for someone's time to help get me started with a bit of tutoring or coding work. Once I get started off right I should be able to take it from there.

The end goal is to create a modern looking and user-friendly interface, with a lot of common sense features built in. I am a mechanical engineer and own a small machine shop, and I've got some designs for a CNC machine I'd like to build and possibly sell. If we can create an interface that is also customizable and open source so others can make use of it, that would be a bonus. I would like to avoid any dependencies on existing interfaces, not sure how reasonable that is but I know it will definitely be much more work.

I would like to use EtherCAT and have seen some posts regarding it, but not sure how well it is supported, or if there are any issues with implementing it. The system ideally would be a small PC connected directly to EtherCAT servos drives, I/O modules, etc.

The interface design is based on  www.openbridge.no/.

Any advice, cautions, referrals, etc. would be greatly appreciated!

The GUI has no direct connections to the hardware,
so the GUI is basically hardware independent.
That is, parallel port, EtherCAT, Remora, Mesa
etc are all the same GUI wise.

You _do_ need hardware specific hal/ini support for all axis

I saw something like that in the linuxcnc...but I do not see how to connect to mesa 7i96s board ....is it possible?

Thanks!!

After flashing, you need to power cycle  the 7I92 or use mesaflash's  --reload option

You should not need to use any kind of cable adapter

If you have a unique breakout, firmware can be built for this in a few minutes

I found my old entry and it looks that there is no Hal pins for the jog increments.
I made a user tab doing what I want.

Is there a way to suppress the original jog tab?

This should be fixed with version 008.047. Let me know if it's all good for you after you are able to update, please.

Thanks for bringing this to our attention!

I did a diff on the two readhmid outputs from the re-flashed one vs. another one that I hadn't touched and they were the same for the pins in question. So either the flash didn't take or something else is broken. (there were other differences in the two files)

In any event for now I'm going to go back to making a DB-25 converter since I've exceeded my rabbit hole depth limit

Thank you for sticking with me.