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Q: How to attach a shaft perpendicularly to a v-slot (rotocasting project)?

Discussion in 'Concepts and Ideas' started by metalorn, Oct 10, 2018.

  1. metalorn

    metalorn Well-Known
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    Hello,

    This is my first attempt to use openbuilds parts to build a rotocasting machine. I have a list of most of the parts I need but can't find a way to properly attach and fix a 5mm shaft to a v-slot perpendicularly. I've attached an image and a link to a youtube video of what I want to replicate. I made a question to the uploader of the video but he hasn't answered.

    What I need help with is, I'm trying to figure out if there is a part (and its name) such as the black one attached to the side of the frame or maybe it is 3d printed. I don't have a 3d printer so I may end up modeling one from wood or resin which is fine with me, but want to give it a go and try to buy the parts if they exist.

    Cheers!

    . vlcsnap-2018-10-08-14h30m15s923b.jpg



    .
     
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  2. Rick 2.0

    Rick 2.0 OpenBuilds Team
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  3. joe williams

    joe williams Veteran
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    Now that's a cool looking "toy"...hope to see your progress here as you get the parts figured out!
     
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  4. metalorn

    metalorn Well-Known
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    Definitely! That will do it!

    Thank you very much!

    Metalorn.
     
  5. metalorn

    metalorn Well-Known
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    I'll upload images once I start putting the machine together. I have bearings, couplings, shafts, pulleys, belt; I was going to use wood but now I'm more confident to order the v-slot rails and a few mounting hubs.

    Thank you and best regards!

    Metalorn.
     
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  6. joe williams

    joe williams Veteran
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  7. Rick 2.0

    Rick 2.0 OpenBuilds Team
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    Looking at the video again, I notice his inner frame goes flat with each revolution which means he is using the same size pulley at both ends of the belt. I would suggest putting a larger pulley at the non-drive end. Using something like a 2:3 pulley ratio will have the inner frame in a different position each time it comes around which will lead to better coverage inside the mold.
     
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  8. metalorn

    metalorn Well-Known
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    Yes, that is a common mistake and I got it covered with a 20 teeth and a 16 teeth, so for 1 full turn of the 20t, there will be 1.25 turns of the 16t. At the end of the 20t 2nd turn, the frames will be align, but facing in opposite directions. Both frames will be align and facing in the same direction after 4 turns of the 20t or 5 turns of the 16t.

    Best regards!

    Metalorn.

    IMG_20181010_191609.jpg
     
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