Society of Robots - Robot Forum
Mechanics and Construction => Mechanics and Construction => Topic started by: blackjack102 on October 28, 2010, 10:31:13 PM
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Last time, I posted for a help...
http://www.societyofrobots.com/robotforum/index.php?topic=8065.msg62633#msg62633 (http://www.societyofrobots.com/robotforum/index.php?topic=8065.msg62633#msg62633)
I made control motion for video camera or camera. It was successful to mount 35 pound video camera. Head dolly and camera mounted on 3/8" rod, and we found little oscillation by comparing two videos as the dolly moved at exact start position to end position twice.
We do not want to have any oscillation on the next dolly project. So, I looked for slewing bearing or precision turntable bearing and found it was very hard to find one. Do you know where good place to get slewing bearing??? I would need two 4 to 6 inches diameter and one 16 inches diameter slewing bearing. They have to be precision turntable. Lazy susan is unaccepted!
This dolly was my second built robot in my life. I plan to work on third dolly.
(http://farm2.static.flickr.com/1366/5125210170_f5e4d331aa.jpg) (http://www.flickr.com/photos/starfalcon2/5125210170/)
dolly (http://www.flickr.com/photos/starfalcon2/5125210170/#) by Starfalcon2 (http://www.flickr.com/people/starfalcon2/), on Flickr
Thanks
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Hi,
If you run it on tracks anyway, two smaller angled ball bearings replacing each wheel should be good.
If the bearings you want are for the pan/tilt then a thrust bearing is needed for the pan (to carry the weight of what's on it), but I'm not sure where you can get it in 16", if at all available - they probably should be made to order (start saving up).
You could make a ring with small bearings used as wheels instead - like how it's done in many µWave ovens rotating plate.
However, I think you overdo the measures - balancing and a well placed amount of high viscosity silicone grease will go a long way to reduce oscillations.