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Thread: Team MeltDown Build Diary

  1. #11

  2. #12

  3. #13
    Long time no post! In the middle of moving house so not much progress... I've 3D printed a small scale test for the grabber arm though to test the mechanism. It seems to work well and should be able to open/close rather quickly with reasonable torque.

    13288219_10154054929885867_601339940_o.jpg

    13282814_10154054929535867_1584818236_o.jpg

    I'm using a beetle size gear motor in this test, but its a 100RPM one, so its extremely slow! That paired with the small pitch of the threaded rod makes for a very boring video, so I'll spare you all from that. Will post a video/pics of a full scale test once I get my hands on appropriate gear motors (Looking at you Ellis ).

  4. #14
    Quote Originally Posted by Giles View Post
    Looking into grabber mechanism designs now. I'm thinking that the top jaw should be a linear actuator and the bottom powered by a sprocket. A 50mm stroke actuator at 5:1 lever ratio would give me 250mm range of motion on the tip of the arm along with plenty of speed. Looks like you can get a 50mm Gimson GLA-750-S with around 200Kgf max, so that would result in 40KG of holding force at the tip of the arm, which seems plenty to grapple a 13.6kg robot.
    Did you make that animation in Maya?

  5. #15

  6. #16
    Quote Originally Posted by Giles View Post
    Yep. I use Maya for all my thinking/testing ideas before I make CAD files with proper dimensions in Inventor. Its just so much faster to make stuff and try out things.
    I use it too but I don't have inventor to make a model using actual measurements, I even did a animation in Maya of my ant weight robot once.

    Screen Shot 2016-05-27 at 06.58.54.png

  7. #17

  8. #18
    oh ok, I was going to just make model out of card board to get the scale

  9. #19

  10. #20

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