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Hello, last year I presented here on Eurobricks a method to equip the LEGO train wheel holder with ball bearings. A disadvantage of that method (see here) was that it required to cut a small part of the wheel holder, thus you had to damage the rather expensive wheel holder. Even worse, removing the ball bearings after modification left you with a more or less useless LEGO piece, thus making it very difficult to sell these LEGO pieces in the future. Furthermore, the modification slightly added to the height of the wheel holder, i.e. the resulting holder was approximately half a plate higher than without modification. I came up with an improvement that does not require cutting the wheel holder and does not notably add to the height of the holder. It does require cutting of a 2L technic axle though, which I do not consider a big thing since these axles are really cheap: When inserting the red axle pieces into the holder, it is important to align them exactly as shown in the picture. When the assembly is complete, it is crucial to prevent the axle from touching the two clamps in the center of the holder. For some additional information, click on the picture above . For a comparison of the wheel holder with and without modification, see this video:
Here's a little concept following the release of new round tiles. I believe it can be useful wherever a small low-friction turntable capable of handling serious weight is needed. It can also be motorized as shown in the video, or alternatively you can put a vertical axle through its middle, just replace one of the 4x4 round bricks (upper or lower) with the variant with a pin hole.
LEGO’s turn table has considerable friction and rotating a model at an exhibition for a whole day would ruin it. A thrust ball bearing is necessary to decrease the friction. I previously 3D printed a large bearing for my Unikitty. For this year’s exhibition I needed a smaller thrust ball bearing so I designed a new medium sized ball bearing. It includes liftarms to hold a worm wheel which results in a rotation ratio of 1:78. The 3D model is available from my website. I hope it helps you for your MOCs.
Rotating a heavy construction is difficult with LEGO's turn table and previous solution for a ball bearing using the droid wheels remain awkward. Mounting the droid wheels is just difficult. They were never meant to be a ball bearing. So I fired up my 3D program and created a Thrust Ball Bearing. Luckily I could also 3D print the whole assembly. I hope this helps. Further details are available here.