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Stepper motor torque?

Discussion in '3D printers' started by JackSmith24, Sep 8, 2020.

  1. JackSmith24

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    Hi all,

    I'm looking to build a CoreXY, and really thinking of going with the LayerFused X301 design with its 300x300 heated bed. I've found a great deal on new stepper motors locally that are rated 40Ncm minimum - are those enough to support that bed using 8mm lead screws, 2mm pitch, single start?

    Thanks!

    Jack
     
    #1 JackSmith24, Sep 8, 2020
    Last edited: Sep 8, 2020
  2. Rob Taylor

    Rob Taylor Master
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    Forty Newton-meters? You sure about that?!

    The NEMA 34 on my cast iron mill's Z axis is... twelve.
     
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  3. JackSmith24

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    Oops! Mea culpa. .4 Nm . :)
     
  4. Rob Taylor

    Rob Taylor Master
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    Heh. That's what I suspected, but you never know. 141oz-in to the Nm, which puts your 0.4Nm around 60oz-in, which is right in the middle of the higher-end pack when it comes to NEMA 17s. Should do any normal sized print bed stage just fine, especially with true 2mm screws and not the standard 4-starts.

    If in doubt, you can Google "online leadscrew force calculator" and plug in the numbers to make sure- I'm sure it's tens of pounds of force though.
     
  5. JackSmith24

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    Thanks Rob! I'll definitely look into the force calculator, but I figured it was really close to the 45 Ncm I've seen all over Amazon and that it was probably close enough. I just wanted some actual knowledge instead of my own assumptions!

    Thanks again,

    Jack

     

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