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  • Grotius
  • Grotius's Avatar
24 Apr 2025 18:01
Replied by Grotius on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

Hi,

Can we test the cia-402 and shortcut linuxcnc pos-cmd to pos-feedback so
there is no ferror in linuxcnc that can trigger a motion stop? 
Or test it by hooking the cia-402 to a stepgen or pid without closed loop feedback. 


 
  • PCW
  • PCW's Avatar
24 Apr 2025 17:25
Replied by PCW on topic Stepper motors for a EtherCat system

Stepper motors for a EtherCat system

Category: General LinuxCNC Questions

The motor type doesn't matter, it just needs to be supported by the drive.
The drive needs to be EtherCat compatible or you will need an EtherCat
-> step/dir interface.
  • cmorley
  • cmorley
24 Apr 2025 16:41 - 25 Apr 2025 00:29
Replied by cmorley on topic qtdragon mod

qtdragon mod

Category: Qtvcp

The problem is that the 'on_counts_value_changed' function uses the 'value' (encoder counts) as an absolute value (as you said), but you could use it as a relative value.

if new value is higher then the last value, then move up 10% higher then the current rate.
if new value is less then the last value then move down 10% from the current rate

The current rate you can get from STATUS or from the appropriate widget.
I'm sure there will be some minor details to adjust to.
  • billru
  • billru
24 Apr 2025 16:27
Stepper motors for a EtherCat system was created by billru

Stepper motors for a EtherCat system

Category: General LinuxCNC Questions

Hello everyone, 
This my first post, I am a DIY hobbyist I am trying to learn what hardware is being used for a diy CNC mills. I ran across different system and setups but I have been unable to get a clear understanding on stepper motors being used in a diy home type CNC mill for a EtherCat setup.I have poked around and searched youtube but still have not got a clear knowledge, my question is can a Nema 23 closed loop stepper motors with encoder be used in a EtherCat setup or dose the stepper have to be EtherCat designated style motor.
I have some 23HS30-5004D-E1000 motors I was going to try and play with and see if I can learn a Ethercat system 
  • Hakan
  • Hakan
24 Apr 2025 16:14
Replied by Hakan on topic LinuxCNC S-Curve Accelerations

LinuxCNC S-Curve Accelerations

Category: General LinuxCNC Questions

It's pretty rudimentary. There are these basic PDOs
      <syncManager idx="2" dir="out">
        <pdo idx="1600">
          <pdoEntry idx="6040" subIdx="00" bitLen="16" halPin="cia-controlword" halType="u32"/>
          <pdoEntry idx="6060" subIdx="00" bitLen="8" halPin="opmode" halType="s32"/>
          <pdoEntry idx="607A" subIdx="00" bitLen="32" halPin="target-position" halType="s32"/>
        </pdo>
      </syncManager>
      <syncManager idx="3" dir="in">
        <pdo idx="1a00">
          <pdoEntry idx="6041" subIdx="00" bitLen="16" halPin="cia-statusword" halType="u32"/>
          <pdoEntry idx="6061" subIdx="00" bitLen="8" halPin="opmode-display" halType="s32"/>
          <pdoEntry idx="6064" subIdx="00" bitLen="32" halPin="actual-position" halType="s32"/>
        </pdo>
so basically one send a wanted position to the drive and read the current position back. That's all.
Following error is calculated in linuxcnc.
The cia402 module basically just passes position after scaling to the drive. And reads back actual position.
It also does the state machine walking, but that's in the beginning, then that idles.
 
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