Re: [ATM] Wire Spider Vibrations

["Chris Dalla Piazza" <dalchri@hotmail.com>]

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@optonline.net] 
Sent: Tuesday, December 05, 2006 10:53 PM
To: Chris Dalla Piazza
Cc: atm@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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