Re: ATM 3-Vane or 4-Vane Spiders

["Vegos" <astro@rvi.net>]

Hi Jim, Doug, Mike:

Doug, that scope with the Carbon Fiber "T" wouldn't be the 28lbs. string
scope at the OSP Walkabout with Mel would it?  Neat spider design, very
simple!

Thanks for the pointers fella's, I am reading and getting a handle on the
procedure and terminology.  It doesn't look all that difficult and certainly
worth a try.

BTW, Mike Q. is a local club member and emailed me offering his aid based on
previous experience with fiberglass, it sounds as though he is interested in
laying up some CF as well.  I think, at the least, there will be some CF
spiders built here this winter.  I would speculate he may be interested in
more than just a spider for the 12.5" project he's pondering.  Could be an
experimental winter in Suth'n Oregon.


Steve Vegos
Rogue River, OR
http://www.rvi.net/~yovw



From: Doug Tanaka


> I like carbon fiber for spiders and have used it to make a curved, 3-vaned
> spider for a 2.37" secondary mirror (diameter span 14.5", thickness .04")
> and a "T" spider that holds a 4" secondary mirror (long vane 19", short
leg
> 8.5", thickness .06").  Both assemblies are strong, stiff and vibaton
free.
> The "T" spider took some tinkering with to get it movement free, but that
> was a result of the cage construction and not the spider.
>
> Doug Tanaka