Re: (ATM) Planetary Telescopes

[Bob Madden <madden@netcom.com>]

Dean,
        Why douldn't one take a threaded rod (cut off bolt head) drill in 
the center and braze the piano wire into it. Or drill cross ways thread 
the piano wire through and twist in a fashion as safety wire (more 
difficult to do).
        My concern is there should be some rigidity along the axis of the 
tube to increase vibration frequency. I suspect you'd use two for each 
vand replacement and the furtherapart they are the stiffer the structure 
would seem. I've seen bicycle spokes and a wheel hub used this way and it 
worked well.

Friendly Bob (after a crashed disk)

):-{])) <----   madden@netcom.com
                madden@svpal.org
 Remember amateur astronomers:
"keep looking for the next Universe"

On Tue, 3 Oct 1995, Dean Ketelsen wrote:

> 
>       There was some mention a month or more ago in reducing spider
> diffraction by using thin piano wire to support the secondary.  Does
> anyone have experience or references in this method?  I would very much
> like to use this technique, but thinking about how to terminate/adjust
> the wire ends has me stumped.  Any ideas?
> 
>                                       -Dean
>