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Turntable thrust bearing for 13mm steel balls

by Vipitis Feb 10, 2018
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where do you find 13mm steel balls at a reasonable price?

I have never looked myself. I got these from magnetic toys, like sticks and balls. You can get steel balls on amazon in 50 packs and 500 packs that are for sling shots - so that might be a source, if not look for bearing balls in 13mm on various online suppliers.

thanks for reply, I found several places that would sell reasonable with free shipping if I bought 20 balls.

i successfully made a downscaled version with 46% (check out the "made" area)
it turns WONDERFULL. tolerances are designed great etc. i'm very happy!

but still, there are 2 things to improve:

1) cage
the idea was neat to mount the balls from two sides. but it doesn't work as good: the balls aren't on a even height level.
so i cut the holes open --> the loading process (putting the balls into the cage) is easier, and the balls rotate freely
okay, maybe i should have printed it with >46%, but is still don't see the practical bonus.

2) how to mount the lower race on the board?
the turntable turns very well. but as soon as i need to move the hole thing, the turntable falls apart and the balls get lose!
in the meantime i found this design here: https://www.thingiverse.com/thing:1113595
maybe you can use it as an inspiration for version 2.0?

Lazy Susan turntable bearing

Glad you tired it, looks really great. I didn't expect it to work downscaled as tolerances are less then.

The cage is designed so it rests on half of the balls to distribute the friction better. you can see similar designs when you google for thrust bearing images.

It is a 2 part design that is purely held together by gravity.

Jeah, it does!

And please don't understand my last comment as criticism but as a suggestion for improvement. As I said: I'm still very impressed. But for my purposes, it can't fall apart when moved.
So maybe if you take the connection from the other design and just Remix it into yours?

So for making some kind of lock for both sides I could make some pins on the inside and let them grab around.... but then it gets really tiny. I can draw one up on a later day.

my original design needed to have space in the center.

Perfect timing. I wanted to order one from Amazon tomorrow.
Design looks good, I'll print it downscaled for my soft air balls (about 4mm or so). Pics coming soon

I am not sure if that works, but you can try. The cage will be the hard part. Good luck and share your success.