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Metal MagBall Carriage

Discussion in '3D printers' started by UltiBots, Jan 17, 2016.

  1. UltiBots

    UltiBots Veteran
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    UltiBots published a new build:

    Read more about this build...
     
  2. Joshua Coke

    Joshua Coke Well-Known
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    hello,
    One thing I learned when building a delta was that the belt must be parallel with the linear movement or you get x y error on the part. I had to change were the ends of the belts connected and make the top pulley measure the same size as my drive pulley.
     
  3. UltiBots

    UltiBots Veteran
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    Thanks for trying our design and for the sharing about the parallel belts! I am not a mech engineer. How/why does non parallel belts induce XY errors? Curious - Brad
     
  4. Joshua Coke

    Joshua Coke Well-Known
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    Changes in angularity translate into less movement in the travel of the truck along the extrusion. So in the middle of travel error is very small, but at the ends of travel the error is larger the closer you get to the end. When a delta printer is printing a large part all three trucks are getting very close to the bottom of the axis at various positions on the part so the effect on accuracy is all over the place.
     
  5. Joshua Coke

    Joshua Coke Well-Known
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    SeeMeCNC forum was my initial source for figuring out why my machine was printing parts with artifacts.
     
  6. Joshua Coke

    Joshua Coke Well-Known
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    I noticed that the V slot actuators have the same problem and I am going to print a standoff for the belt to interface the plate so that the belt is parallel over the entire length of rail. If i use a drive pulley that is larger than the idler pulley supplied then I will print an idler to match it's diameter.
     

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