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| JonnyBoy:
Okay guys. I just got my piece back from the laser cutter. Everything fits fine, but I'm having a problem with the internal gear. The weight of the mdf is causing it to catch, and packing it with ball bearings is not working as well as I initially hoped. It's almost as though it needs some sort of track to work flawlessly. I was looking at lazy susan bearings, but they are approaching 45 dollars for the one I'd need, so I was thinking of making something myself. Anybody have any ideas on how I can get this thing to rotate nicely when it's oriented vertically? Horizontally it works like a dream but vertically I'm having some trouble. One friend suggested routing a slot in both the inside of the internal gear and the ring around it, drilling a hole in the side, stuffing the entire thing with ball bearings and then closing it back up again. |
| JonnyBoy:
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| stan2323:
--- Quote from: JonnyBoy on February 02, 2009, 01:01:26 am ---Okay guys. I just got my piece back from the laser cutter. Everything fits fine, but I'm having a problem with the internal gear. The weight of the mdf is causing it to catch, and packing it with ball bearings is not working as well as I initially hoped. It's almost as though it needs some sort of track to work flawlessly. I was looking at lazy susan bearings, but they are approaching 45 dollars for the one I'd need, so I was thinking of making something myself. Anybody have any ideas on how I can get this thing to rotate nicely when it's oriented vertically? Horizontally it works like a dream but vertically I'm having some trouble. --- End quote --- You may want to just have it at an angle. Find the angle it starts to not work smooth and go a little less that that. I think it would still work just a bit slower. My other suggestion would be to make the hole in the center larger and press a sealed bearing into the center. Ideally the bearing would need to be the same thickness as the MDF. You would need two bearings one for the gear set and one for the back frame part. |
| CathalDublin:
Wow look excellent could you not sink a bearing like this into the front and back of it? |
| JonnyBoy:
Right now it's bordering on done. It was just a 2 or 3 week project for class, and I'm excited that I just managed to get it done. The planetary gear slides on some nylon washers, so it's smoothish but not ideal. If I were doing this project on a different scale, there would definitely be some adjustments that I would do, and someday I may make a revised one (with rollers and roller bearings, maybe even a gigantic lazy susan bearing, that'd be nice). When I get the time and money. I'm going to have some updated pictures and some promotional material for my crit. Thanks for the kind words guys. |
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