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Lead Screw Upgrade from MPJA

Discussion in 'Mods and Upgrades' started by Johnny Yuen, Dec 13, 2015.

  1. Johnny Yuen

    Johnny Yuen New Member

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    Hello all,

    I purchased some T8 lead screw steppers from MPJA for $34.99/each. It came out to be about $70 after tax, and I must say the results are very impressive. All the connectors came stock (no soldering needed), which is a perk in comparison to the SainSmart equivalent found on Amazon. The only thing I had to do was switch the wires to match the stepper configuration found on the old stepper motors. Other than that it was pretty much plug and play. Z ribbing is gone and I am happy!

    MPJA Lead Screw Upgrade: http://www.mpja.com/3D-Printer-Stepper-Motor-with-T8-Leadscrew-300mm/productinfo/32386 MI
    Printed the new lead screw coupling upgrade: http://www.thingiverse.com/thing:1147438

    Change Line under Configuration.h in Arduino:
    #define DEFAULT_AXIS_STEPS_PER_UNIT {80,80,400,723.38} // default steps per unit for RoBo 3D R1
     

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    #1 Johnny Yuen, Dec 13, 2015
    Last edited: Dec 14, 2015
    jim3Dbot, Mike Kelly and WheresWaldo like this.
  2. WheresWaldo

    WheresWaldo Volunteer ( ͠° ͟ʖ ͡°)
    Staff Member

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    Good find @Johnny Yuen, you should know I am a fan of finding alternative sources for the various things we want to do with our Robo's. I see that you are also using my adapter and it is working for you. Please add to your opening post that the Z steps for this flavor of lead screw should be 400, since it is a TR8 with 4 starts which makes it 8 mm travel per revolution. So it is the same edit as the Sainsmart steppers.
     
    #2 WheresWaldo, Dec 14, 2015
  3. Johnny Yuen

    Johnny Yuen New Member

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    @WheresWaldo , Yes, your adapter worked very well! I had to sand down the piece slightly but it was a well designed part.
     
    #3 Johnny Yuen, Dec 14, 2015
  4. jim3Dbot

    jim3Dbot Active Member

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    Say Johnny........I installed the same from Marlin, a few months ago..........did you revise Z max accel or max feedrate also?...mine is (accel)100mm/sec/sec & (max feed)5mm/sec. 400mm steps were right on implementing cal cube. Thanks in advance.....Jimmy
     
    #4 jim3Dbot, Feb 14, 2016

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