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In Reply to: Re: Ceraballs - picture here posted by Jeff Starr on March 09, 2003 at 10:26:30:
why don't you just try out the unipivot foot as suggested. A set of three is almost free and will take only an hour or so including the trip to the hardware store for parts. You can see a picture of a non pivot version of this kind of device at http://www.omegaloudspeakers.com/news.html The top washer/nut has been shown as two parts for clairity while in real life they are epoxied together as one. There is a detailed description of construction on the forum at Louis's site under Iso Foot Design. Regards Moray James.
Follow Ups:
Hi, I'm not really looking for footers, to buy or make, at this time. I'm just curious and like to gather info, for future projects. It looks to me, like the ball in the Ceraballs would move freely, like a bearing, as opposed to your design, of which the half round of the accorn nut is fixed. I would like to see a photo of your design. I'm not saying that yours is not good, just different from the Ceraballs. Please correct me, if I'm wrong.
Jeff
Both designs will act as unipivots. In fact the bearing will have more opportunity to rattle and make noise if it is not perfectly seated and have a constant and even load. I think that if you look at turntable designs you will find that a fixed bearing is far more popular than using a bearing in a cup(easier to build) with a point, strictly from a clearence point of view you need to have tighter tollerance with a bearing than you do with a point. The fixed point idea has less chance to rattle and make noise (chatter) as would a bearing in a cup or race. So from a DIY position the fixed point unipovit is easier to build with fewer potential problems and a lower degree of tollerance to get the same job done. From an ultimate point of view you could probably build a design with less friction using a bearing(s) but I think that would be overkill for this kind of application given that you have then got more things which could go wrong. Build some anyway and tell people what you think. I would keep the overall height as short as is possible and if you drop the point of load (contact) to below that of the bearing you will further inhance the stability of the unipovit. Have some fun. Regards Moray James.
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