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Tried it two ways, still doesn't work. In the first case it gives an error.

pi@raspberrypi5:~/linuxcnc/nc_files $ ./M101
bash: ./M101: cannot execute: required file not found
pi@raspberrypi5:~/linuxcnc/nc_files $ bash M101
<commandline>:0: pin 'hm2_7i95.0.ssr.00.out-01' is connected to a signal
: numeric argument required

Does the script work if run from the command line?

 That is, does:

./M101

work?
 

Does the command you are trying to use in the M-code, work in a terminal from the command line?

Do you get any error messages in the terminal when you try to run the M-code if you start Linuxcnc from the command line?

Sounds like it should be a straight forward analog system conversion. What about things like the spindle controls, does it have a tool changer?

Best advice, is first thing e-stop circuits, then get encoder feedback working, then the servo drive enable\disable, then add safeties (limits etc), then confirm directions are correct, finally tune your position loops.

Hi everyone,

I'm currently working on the retrofit of a 3-axis vertical machining center (from 1995) and have decided to use LinuxCNC with Mesa boards. The machine is in excellent mechanical condition, but the original controller (Fagor 8025M) is beginning to fail. I’m still evaluating whether it’s worth repairing, but I’m leaning toward fully modernizing it instead.

Here are the key technical details of the system:

•  **Machine type**: 3-axis vertical milling machine
•  **Original controller**: Fagor 8025M
•  **Motors**: SEM MT30R4-46 brushed DC servos, each with internal tachometers
•  **Drives**: Axor analog drives (Miniclamp 140, Minispeed, Minispeed 140, Minispeed 200) with ±10 V control input
•  **Spindle drive**: Fanuc A06B-6060-H003#H503 (also analog control)
•  **Feedback**:
•  **Main feedback**: KA300 linear scales (Extent 570D), 5 µm resolution, differential outputs (A/B/Z, A-/B-/Z-)
•  **Velocity loop** is handled inside the servo drives via tachometers
•  **Planned control strategy**: Full closed-loop position control via linear scales in LinuxCNC
•  **I/O needs**: At least 18 digital inputs for limits, emergency stop, lubrication pump, coolant, etc.
•  **Desired precision**: Hundredths of a millimeter (0.01 mm) or better
•  **Budget**: About $1500 or less
•  **Planned Mesa boards**: Leaning toward a 5i25 (PCIe) + 7i77 for analog servo control and I/O

The machine will be used for both production and toolmaking, so reliability and precision are key. The current system performs interpolation and achieves 0.01 mm precision, and I’d like to match or improve upon that.

I’d like to ask:

- Has anyone here done a similar retrofit with SEM DC motors and Axor drives?
- Is it reasonable to expect similar or better precision from LinuxCNC using KA300 scales and Mesa hardware?
- Are there any specific concerns when using analog ±10 V control with older servo amplifiers?
- Any advice or experience you could share with full closed-loop systems based on linear feedback?
- I’m also interested in your thoughts on encoder scaling, latency tuning, and best practices for safety inputs and interlocks.

Info:
digital-readout.com/wp-content/uploads/2...stallation-guide.pdf
www.axorindustries.com/wp-content/upload...ce-Manual-MS-Eng.pdf
www.mroelectric.com/static/app/product/p...a06b-6044-manual.pdf
forum.linuxcnc.org/media/kunena/attachme...17/MT30R4Extract.pdf

Thanks in advance for any help or tips you can share! I’ve already started digging into the documentation but would really value input from those who’ve done similar projects.

Best regards,  
Santiago
 

Yes, of course. Without permission, Linuxcnc gives an error message.