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Unread 23-01-2009, 00:13
t41w4ne5ef0b t41w4ne5ef0b is offline
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Making a custom lazy-susan style bearing

Does anybody know how or where to get a lazy susan bearing with an inner diameter large enough to fit the orbit balls in with some space to spare?

The KoP's lazy susan bearing is much too small, and I don't think cutting it would be a good idea because so much of it will have to be cut away. Online, the most I found was a 16" diameter lazy susan, which is kind of big, and the cross section is like a rectangle, so I doubt it would be good for our application of it.

What I was thinking was making a custom bearing, but I have no idea where to start in designing and fabricating one . I thought about using some wood to make two platters with a circular channel for the ball bearings, but I don't know how to keep them together so the bearings don't fall out.
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Unread 23-01-2009, 00:15
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Re: Making a custom lazy-susan style bearing

search mcmaster for turntable. We just bought some from there made from cast aluminum that are awesome. I believe its a 10.5" inner opening and they cost $30
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Unread 23-01-2009, 00:17
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Re: Making a custom lazy-susan style bearing

Go to mcmaster and search lazy susan. Edit sean beat me to it.
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Unread 23-01-2009, 00:21
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Re: Making a custom lazy-susan style bearing

HAHA I win.
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Unread 23-01-2009, 00:23
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Re: Making a custom lazy-susan style bearing

I know that I saw a roughly 12" one at a Rockler Woodworking shop several years ago. You might try a store like that.
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Unread 23-01-2009, 00:25
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Re: Making a custom lazy-susan style bearing

We thought about this problem for a long time before we came up with a good way to do it. A turret needs two things to work well: a good support base, and a means of transmitting power to it (for turning). Unfortunately, turntables and big sprockets are expensive and need to be ordered. We also don't have access to any lathe big enough to make round parts that big....

Eventually we came up with this solution: a v-belt pulley for an evaporative cooler with the hub cut out and supported by bearings on the outside. This set up has the neat feature of having only one round part; the power and support are both provided by the pulley. The best part is that you can get one at the local hardware store (in AZ) and it only costs about $30.



Note: the bearing in the picture is going to change to a normal ball bearing... we didn't have one the right size at the time of building it, so we just faked it with what we had on hand.

Last edited by s_forbes : 23-01-2009 at 00:29.
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Unread 23-01-2009, 00:29
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Re: Making a custom lazy-susan style bearing

The one in the kit could be cut open to fit a ball through. That's our backup plan....and the same one is available at our local Ace hardware store for about $12 in case we mess it up.

We made our own turret bearing...not sure how it'll work out, but in early testing it seems to work.

Pics on our photo gallery

I think we have some video of it moving, too.
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Unread 23-01-2009, 02:30
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Re: Making a custom lazy-susan style bearing

We machined one and used air soft pellets for bearings
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Unread 23-01-2009, 02:40
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Re: Making a custom lazy-susan style bearing

Quote:
Originally Posted by PowerOfKings View Post
We machined one and used air soft pellets for bearings
Wow, thatz all i have to say. Way to think outside the box. Don't shoot, whatever you do.
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Unread 23-01-2009, 02:54
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Re: Making a custom lazy-susan style bearing

Lee Valley Tools has them, too, at http://www.leevalley.com/wood/page.a...50,43298,43316 We used the 12" one on our 2006 robot and will likely get a 17" one this year.

Jason

P.S. My sustained applause for 1726 and other teams who are so willing to inspire others by sharing their ideas.
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Unread 23-01-2009, 03:04
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Re: Making a custom lazy-susan style bearing

In 2006, team 696 made their own custom 4 point contact turret bearing. It was made from lasercut 1/4" thick aluminum plates, with 45 degree angles milled into their edges where the balls rode. There were 4 plates: inner and outer, and upper and lower of each. The balls were not held in any race, but were alternating steel and delrin. It worked very well. It was very smooth, had no slop, and was able to handle a great deal of load. Lots of work to make though.
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