Duet3D Logo Duet3D
    • Tags
    • Documentation
    • Order
    • Register
    • Login

    Nozzle height

    Scheduled Pinned Locked Moved
    General Discussion
    4
    6
    283
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • damaged_goodsundefined
      damaged_goods
      last edited by

      Re: Nozzle will not start low enough to print
      Phaedrux MODERATOR 31 Jul 2020, 21:54
      @damaged_goods said in Nozzle will not start low enough to print:

      M92 X172.00 ; set movement speed to match m915 H param
      M201 X100.00 ; reduce acceleration
      M566 X100.00 ; reduce maximum instantaneous speed changes (mm/min)
      G1 H1 X-1160 F6000 ; move quickly to X axis endstop and stop there (first pass)
      ; G1 H2 Z-5 F6000 ; lower Z again
      G90 ; absolute positioning
      M92 X80.00 ; set steps per mm back to default
      M566 X900.00 ; set maximum instantaneous speed changes back to normal (mm/min)
      M201 X500.00 ; set ac

      It's quite bizarre to alter your steps per mm in a homing file. What is the reasoning?

      damaged_goodsundefined 1 Reply Last reply Reply Quote 0
      • damaged_goodsundefined
        damaged_goods @damaged_goods
        last edited by

        @damaged_goods Could someone explain what and why it is "bizarre" to alter steps per mm in homing file. I have no reasoning and am never offended to learn something new 🙂

        fcwiltundefined Phaedruxundefined 2 Replies Last reply Reply Quote 0
        • Vetiundefined
          Veti
          last edited by

          the steps per mm depend on your pulleys teeth and the belt pitch
          or the leadscrew pitch.
          not taking into account microstepping which rrf does automatic step conversion.

          so during operation you cant normally change either, its not obvious why you would want to change them.

          1 Reply Last reply Reply Quote 0
          • fcwiltundefined
            fcwilt @damaged_goods
            last edited by

            @damaged_goods said in Nozzle height:

            @damaged_goods Could someone explain what and why it is "bizarre" to alter steps per mm in homing file. I have no reasoning and am never offended to learn something new 🙂

            The "steps per mm" settings are determined by the design of your printer.

            They should never need to be changed if the hardware does not change.

            The purpose of the settings is to achieve the correct amount of movement on each axis for movement commands.

            For example, assuming you have issued a G91 to enable relative movement mode, a G1 X10 should move exactly 10mm on the X axis.

            Likewise for Y and Z.

            If the settings are wrong the actual positions will not match the commanded positions and bad things will very likely happen.

            Frederick

            Printers: a E3D MS/TC setup and a RatRig Hybrid. Using Duet 3 hardware running 3.4.6

            1 Reply Last reply Reply Quote 0
            • Phaedruxundefined
              Phaedrux Moderator @damaged_goods
              last edited by

              @damaged_goods said in Nozzle height:

              @damaged_goods Could someone explain what and why it is "bizarre" to alter steps per mm in homing file. I have no reasoning and am never offended to learn something new 🙂

              The steps per mm should be set in the config.g and not in a homing file. Once it's set, it makes no sense to change it unless you have some very specific reason. Otherwise it just doesn't belong there.

              Z-Bot CoreXY Build | Thingiverse Profile

              1 Reply Last reply Reply Quote 0
              • damaged_goodsundefined
                damaged_goods
                last edited by

                Thank you everyone

                1 Reply Last reply Reply Quote 0
                • First post
                  Last post
                Unless otherwise noted, all forum content is licensed under CC-BY-SA