New Kossel going haywire after homing



  • As I home my New Kossel I have problems toward the end of the homing, preventing me from going any further.

    It almost looks like my steps per mm are off, the distances seem so much further like they are cm not mm, a mm is tiny. Which is confusing because I'm using 16x microstepping, GT2 belt, 16 tooth pulleys, and what should be 1.8 mm stepper motors. My steps per mm should be 100 right?

    It looks as if when it is going in the negative Z direction that the Z axis moves faster than X and Y which I know this isn't the best angle, I can do better than that but the focus right now is why when it gets to the line to attempt to Center itself, it tries to go outside it's boundaries. Why would this happen??

    This really confuses me, I'm running the latest RC3 firmware and appear to be running the latest release of everything on my Duet Wi-Fi 1.01

    My delta radius might be slightly off depending on where I'm supposed to measure (center of tower or extrusion but using 2040, sort of, to the surface of the linear rail? Idk).

    I do not see that affecting this though.

    This is a link to a video of what it does, my config.g and my home.g (or whatever the home file is called). This is uploaded to my Google Drive.
    https://drive.google.com/folderview?id=18KKlNvpFhjq_FplvQkj2zU5aO0uWJfUb

    What am I missing?? Any and all help is appreciated, hopefully some fresh eyes can identify the problem quicker…it's just frustrating for me at this point. Why is this behaving the way that it is?



  • Hello!

    I had some of the same issues, the reprap configurator sais that the delta radius is the distance between the pulley (tower center) and the middle of the bed, but this is false, the delta radius is the horizontal length of the connecting rod between the pulley and the carridge when the carridge is homed. After I corrected this, my printer did not leave the print area anymore.

    The steps/mm question:
    Home your printer, mark the carridge height move the Z axis 100mm down, then check each tower how much movement did you get. From this you can calculate your steps/mm


  • administrators

    This line in config.g

    M574 X2 Y2 S1 ; Set active high endstops

    should be:

    M574 X2 Y2 Z2 S1 ; Set active high endstops



  • @dc42:

    This line in config.g

    M574 X2 Y2 S1 ; Set active high endstops

    should be:

    M574 X2 Y2 Z2 S1 ; Set active high endstops

    Ha! Ya know, I was thinking about that….I questioned it because of the Delta geometry and thought that the Z interfere. I noticed it going specifically away from Z and toward XY

    I'm curious what mistake I made when setting it up the configuration file.

    Thank you!!!



  • Apparently the motors on a delta are supposed to be labeled in an anticlockwise direction too haha whoops.


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