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OpenBot

Discussion in '3D printers' started by Midgetmountain, Jun 2, 2014.

  1. Midgetmountain

    Midgetmountain Well-Known
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    Midgetmountain published a new build:

    Read more about this build...
     
  2. Tweakie

    Tweakie OpenBuilds Team
    Staff Member Moderator Builder

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    Hey @Midgetmountain that build looks really great.

    Just wondering, do you get enough rigidity with the open ended rail design as I can imagine a bit of wobble at the extremes if a high rate of axis acceleration is used ?

    Tweakie.
     
  3. angelo

    angelo Well-Known
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    great job
     
  4. Midgetmountain

    Midgetmountain Well-Known
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    Hey Tweakie,

    There is little amount of wobble in the boom (if I move it by hand), but it is surprisingly stiff in fast acceleration. At the moment I have two issues with my design, the build platform mounting (that should be fixed once I can get my hands on a openbuild build platform), and plates mounted on the v-slot moving.

    Its still a work in progress.
     
  5. Keith Davis

    Keith Davis Master
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    Midgetmountain, that looks a lot like a design I did earlier this spring. Problem I had was keeping the x axis arm parallel to the y axis. I looked at Bukobot's Bukito design and saw the solution. Their plate that runs up the vertical frame piece and carries the x axis arm has only 3 wheels. Mine had 4 wheels. They had 1 adjuster wheel on one side and the two stationary ones on the opposite side. That creates a triangle wheel design (actually stronger than a 4 sided design). Adjusting the one wheel automatically squares the x axis bar with the y axis, if everything else is square.Your design shows 4 wheels on that vertical axis bar. Try 3.

    Here's a picture of my opnbot design. [​IMG]
     
    Seul Kee and Robert Hummel like this.
  6. Midgetmountain

    Midgetmountain Well-Known
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    Hey Keith,

    Thanks for the feedback.

    There are few problems the current design, that I need to fix. The biggest pain is the plate mounted on the v-slot can slip, making it fun keeping everything aligned. I am going to print a block for the boom to keep it level, and another one for the base to keep it square. Another issue is how I have the build-platform supported (currently used some wooden slates), but when I can get an openbuilds build platform that should fix that up. I am also designing a extruder holder with a force sensor built in, so I can do auto bed levelling.

    Below is my first concept, similar to your BldrBot (Which I really like!). I cut this design down so I could keep the parts count down, I was worried that the single 20x20 boom would not be that sturdy, but it surprised me.

    [​IMG]
     
  7. raykholo

    raykholo Journeyman
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    This looks a lot like a design I'm working on right now except in mine the bed is stationary and the arm assembly will move in all 3 axes, so it's a bit more OX/ Routy like as well. Build log to come soon.
     

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