Gallery, Projects and General > Project Logs
Making a Rotary Table
BillTodd:
With a slow moving thing like a rotary table, a plain bearing will give the better damping, making less prone to ringing.
Bill
NormanV:
Bearing (!) in mind Andrew's and Bill's comments here is my revised design. I like the idea of using Teflon as a bearing surface and have exchanged the bearing with a bush, ideally this would be bronze but as I don't have any I will use steel. This should not cause problems when making a cut and hopefully I will be able to rotate the table to produce curved surfaces.
PekkaNF:
Is that from gunsight or "target finder"? I like that a lot.
I don't like PTFE that much. I have used it a little on fly reel bearing/brake, but it was not that easy to glue. Also it needs certain surface quality, too coarse is no good, but neither is too smooth. It is also very soft and has tendency to extrude when loaded. Therefore you need a LOT of area. You might get away on top, because you have a lot of surface area there, but I don't like the look of bottom bearing on teflon. I would use metal (or composite) plain bearing. Easy on lubricant, you don't want it on teflon. The good thing is that if teflon sucks, you can go on POM and after that you can go reinfoced composites, and by them you know a thing or two on syntethic bearings.
As you see I'm big on rolling bearings, but plain bearings are great on loads which would brinnel ballbearings in no time.
My 2 erocents,
Pekka
NormanV:
I have no idea what the original use of the bearing was, I removed it from a piece of specially made equipment whose use I do not know.
mattinker:
You could use mild steel as a thrust washer against Al, Al steel are a good bearing combination. Example, steel camshaft running in Al cylinder heads. For the speed that your dividing head is going to turn, oil lubricated Al steel would be good.
I liked the idea of a split cotter to lock the turntable.
Regards, Matthew.
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