Recent Posts

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Project Progress / K'NEX Ball Machine - Death Star II
« Last post by GWorks on May 08, 2019, 10:46:37 pm »
Hello,
Finally some noteworthy progress for my first (and probably last) ball machine...Because with the square pieces of K'NEX I've been trying to make a ball. A big ball. A ball of death and destruction.
...
The Death Star (II, since it will be open from one side)
It's quite piece-intensive. Here follow some pictures:
  • Hexagons. Nice try. Flexible, but doesn't work. Remains a flat surface.
  • Pentagons! Yay! but how to connect them?
  • Ooh, looks promising... I got a circle now! But there's a hole in the middle.
  • This might work...
  • It does!
  • Backside... I will replace some of the silver 3D connectors with purple ones, otherwise I don't have the pieces  ;D
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Introduce Yourself / Just found you
« Last post by imans314 on May 07, 2019, 10:07:19 pm »
And thanx for adding me.

My name is Paula.
I am a builder from the Netherlands.
I have to admit, I have been a bit slacking in my build lately but....
this site gives me a lot of inspiration.

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Project Ideas and Help / Re: Ball Machine half pipe does not work well.
« Last post by austron on April 14, 2019, 05:00:15 am »
That would probably work best of all! If you have a sufficient large PVC pipe, and the means to safely cut it in half, then definitely do that!
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Project Ideas and Help / Re: Ball Machine half pipe does not work well.
« Last post by Togofan on April 14, 2019, 04:57:45 am »
How about a cut in half PVC pipe?
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Project Ideas and Help / Re: Ball Machine half pipe does not work well.
« Last post by austron on April 14, 2019, 04:55:01 am »
It might, it's worth a try, but it would probably be helpful to find something a bit more rigid. The problem with cardboard is that it can crease and kink easily. You can get thin sheets of plastic at hardware or hobby stores for very cheap. A flexible plastic cutting board might work as well.
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Project Ideas and Help / Re: Ball Machine half pipe does not work well.
« Last post by Togofan on April 14, 2019, 04:50:11 am »
Would using flexible cardboard from a spiral bound notebook work? 
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Project Ideas and Help / Re: Ball Machine half pipe does not work well.
« Last post by austron on April 14, 2019, 04:46:15 am »
My theory is that the paper half pipe is not rigid enough. The ball is losing too much energy too quickly because it is all going into deforming the paper as it rolls over it. If you made your half pipe out of a slightly more rigid material, such as a sheet of thin plastic, or several sheets of think card stock glued together, I think it would perform much better.

Good luck!
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Project Ideas and Help / Ball Machine half pipe does not work well.
« Last post by Togofan on April 14, 2019, 04:21:44 am »
I am trying to make a half pipe for my new ball machine. 

 

 The ball drops in at the top and should swing back and forth good until it nears the bottom of the halfpipe.  Then it should exit through the little hole.    The ball instead drops in and very lazily does two or so very small swings back and forth and then rolls straight to the exit.   I am using 2 layers of paper for the halfpipe. 
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Project Progress / Re: Knex Ball Machine - the attic
« Last post by RealBorisBoef on April 05, 2019, 02:11:44 pm »
That's a LOT of paths. can't wait to see the final result!
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Project Progress / Re: Knex Ball Machine - the attic
« Last post by smunt93 on April 05, 2019, 01:17:38 pm »
I am still here. Its taking a lot longer than anticipated.

Most of the model is drafted out at this point with most of the main structural elements and lifts in place.

In the end there should be 8 networks with around 40-50 paths.

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