HAL for open-loop encoder homing
- Alexf2a
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11 Oct 2026 19:38 #350197
by Alexf2a
HAL for open-loop encoder homing was created by Alexf2a
Hello.
I am using a Mesa 5i25/7i76/7i85s setup with LinuxCNC 2.9.4 on a milling machine.
I am using an open-loop control configuration. The axes are equipped with Chinese Sino optical linear scales, which I want to use for precise homing. AI helped me write the HAL and INI files for this setup. Before I added the BACKLASH parameter to the INI file, the system performed homing correctly and accurately using the scales' index mark; however, after adding BACKLASH, accuracy and repeatability were lost—sometimes it was accurate, other times not. I have attached the HAL and INI files. Could you please advise on how to fix this issue?
I read that this can be resolved using firmware that supports step/direction indexing, but I don't know where to download it.
Thank you.
I am using a Mesa 5i25/7i76/7i85s setup with LinuxCNC 2.9.4 on a milling machine.
I am using an open-loop control configuration. The axes are equipped with Chinese Sino optical linear scales, which I want to use for precise homing. AI helped me write the HAL and INI files for this setup. Before I added the BACKLASH parameter to the INI file, the system performed homing correctly and accurately using the scales' index mark; however, after adding BACKLASH, accuracy and repeatability were lost—sometimes it was accurate, other times not. I have attached the HAL and INI files. Could you please advise on how to fix this issue?
I read that this can be resolved using firmware that supports step/direction indexing, but I don't know where to download it.
Thank you.
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