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    Clarification on delta calibration

    Tuning and tweaking
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    • DjDemonD
      DjDemonD last edited by

      The wiki says :

      Setting up the bed.g file
      The bed.g file defines the points that will be probed, and the number of factors that will be calibrated. RepRapFirmware supports the following calibration schemes:

      4-factor: Similar to traditional manual delta calibration, but much faster. Adjusts the endstop switch position corrections (M666 XYZ parameters) and the delta radius (M665 R parameter).
      6-factor: as 4-factor but also adjusts the X and Y tower position corrections.
      7-factor: as 6-factor but also adjusts the diagonal rod length (M665 L parameter).
      8-factor: as 6-factor but also adjusts the X and Y tilt angles (M666 A and B parameters).
      9-factor: as 8-factor but also adjusts the diagonal rod length (M665 L parameter).
      For typical delta printer builds, 6-factor is best. You should be able to measure the diagonal rod length accurately enough, and for auto calibration to be able to determine it accurately, you need probe points that are well outside the triangle formed by the towers. Likewise, without points well outside that triangle, auto calibration cannot accurately distinguish the effect of bed tilt from misplaced towers.

      So does 8 factor also calibrate the rod length?

      I'd like to calibrate everything except rod length (to manually adjust to get accurate x/y dimensions). What is the best way to do that?

      Simon. Precision Piezo Z-Probe Technology
      www.precisionpiezo.co.uk
      PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

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      • T3P3Tony
        T3P3Tony administrators last edited by

        Nope from reading that you need 9 factor if you want the tilt angles and rod length else use 7 factor for the rod length

        Edit: best way to do everything except for rod length is to use 8 factor

        www.duet3d.com

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        • DjDemonD
          DjDemonD last edited by

          Thanks Tony.

          Simon. Precision Piezo Z-Probe Technology
          www.precisionpiezo.co.uk
          PT1000 cartridge sensors NOW IN, just attach to your Duet board directly!

          1 Reply Last reply Reply Quote 0
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