[ATM] Wire Spider Vibrations

[eric torraca]

Micheal,

I have no idea how Chris is doing it but I was thinking of adapting it to my
design. I was going to slide the pvc around the currently existing wooden
secondary holder. I'm still thinking about it though as that would add extra
weight.

Eric

On 12/6/06, Chris Dalla Piazza <dalchri at hotmail.com> wrote:
>
> Michael,
>
> I drilled holes into the PVC.  Then I tied the ends of the wires around
> some
> metal crafting beads that my wife had.  The beads are wide enough to
> prevent
> the wire from slipping through the holes.
>
> The only thing that I dislike about this method is that the wires get a
> little kinked or bent near the knot.
>
> My initial impetus for doing this was to replace my traditional spider
> whose
> veins had gotten bent during collimation from me twisting the secondary to
> align it.  This resulted in thick, and on one side of the star image,
> double
> diffraction spikes.
>
> Keeping the wires aligned and straight to create sharp diffraction spikes
> is
> important to me for my imaging.  Aside from accomplishing this, the design
> has also cut down the brightness of the diffraction spikes quite a bit.
>
> -----Original Message-----
> From: Michael Lindner [mailto:mikell at optonline.net]
> Sent: Tuesday, December 05, 2006 10:53 PM
> To: Chris Dalla Piazza
> Cc: atm at atmlist.net
> Subject: Re: [ATM] Wire Spider Vibrations
>
> Chris Dalla Piazza wrote:
> > My final design was to select a PVC pipe the next size smaller than my
> > secondary and then fasten the wire to the inside of the pipe, attaching
> the
> > secondary to the end of the pipe.  My attachment points were at the ends
> of
> > the pipe and one attachment at the telescope tube wall.
>
> Chris, how is the secondary attached to the PVC? Silicone? Does that
> actually stick to the PVC?
>
> --
> Michael Lindner
> http://www.starastronomy.org *** http://home.att.net/~mikel
> http://www.atmsite.org *** http://www.atmlist.net
>
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