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Using a leadscrew in place of a linear rod on a 3D printer

Discussion in 'Concepts and Ideas' started by Rhys Wiebe, Feb 13, 2018.

  1. Rhys Wiebe

    Builder

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    So I'm thinking about building a fairly large CoreXY style printer, and I want the print bed supported on all corners, rather than a cantilever design. So my question is, if I put leadscrews in two diagonally opposite corners, and linear rods and bearings in the other two, would I run into any problems?

    Something like this:
    [​IMG]
     
    #1 Rhys Wiebe, Feb 13, 2018
    Last edited: Feb 13, 2018
  2. SureD

    SureD New
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    hi, I don't see any problem with this concept. As long as you don't under dimension the rods and screws according to the weight of the build platform.
    Possible further variations are without considering budgets questions:
    To make it easier to understand: let us name the corners A, B,C, D.
    a. 4 motors corners with screws A, B, C, D, all in parallel with 1 Z-axis driver. Recommend to use Trinamics TMC2130 and 4 optical axis rods in the middle of AB, BC, CD, AD
    b. 2 motors corners A, C with screws, parallel with 1 Z-axis driver, 2 optical axis rods in the middle of AB, BD and 2 optical axis rods in corners B, D
    c. 4 optical axis rods in corners A,B,C,D and 2 motors with screws AB, CD or BC, AD

    keep in mind to build your platform build system ( typically 2 plates sandwiched with spacers ) in a way that you can control sagging of the upper plate that is heated.
    keep up posting actual build.
     

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