Re: [ATM] Spider Design and Vibration

["Rod Shea" <RodShea@comcast.net>]

Mel,

Thanks for the reply.  I had wondered why your TriDob had what was ,in 
effect, a 4 vane wire spider <g>.  Does this mean that my choices are a 3 
vane spider with solid vanes, or a 4 vane wire spider?  If I have a round 
upper cage, and hence freedom to place attachment points anywhere, that a 4 
vane >0< configuration would make as much sense as any?

Thanks,

Rod

----- Original Message ----- 
From: "Mel Bartels" <mbartels@bbastrodesigns.com>
To: <atm@atmlist.net>
Sent: Tuesday, November 23, 2004 10:40 PM
Subject: Re: [ATM] Spider Design and Vibration


>>>>
> this, >0<, where > and < are the 2 sets of vanes, and 0 is the axis of the 
> secondary holder.  Is there a similar advantage (less vibration) to 
> splitting a 3 radial vane spider, like this >0-?  Also, has anyone done 
> this one 0>-? it would seem to be easy to make, although the vanes
> <<<
>
> Yes, I've experimented with this type of 3 vane spider, both solid and 
> wire, and neither worked very well.  The bottom single vane does not 
> dampen the rotational energy that the upper 2 vanes can impart to the 
> secondary.  As the secondary is twisted, the upper 2 vanes merely find a 
> new intersection that is very close to some radius position of the bottom 
> vane.
>
> Mel Bartels
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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