Re: [APML] Search for flexure and mirror movement info

[George Anderson <tillerman1@videotron.ca>]

I'll also add that the tube can be a source of flexure. An aluminum tube
is much better than a sonotube. Sonotube flexes a lot, even more when it
is humid.

George Anderson
Montreal Canada

Clear skies and good health

> Gene Horr wrote:
> 
> 1) If you have spring loaded bolts for the primary you need to get rid
> of the springs
> and drill and tap for three additional bolts so that it is a push/pull
> arrangement.
> 
> 2) Most visual newtonians have entirely too thin spider vanes.  You
> may need to
> replace them with something thicker.
> 
> 3) The secondary is often just three bolts with no loading.  You'll
> need to either
> add a push pull arrangement for this or add a central pivot point
> which you will
> use all of the bolts to pull the secondary against.
> 
> 4) You may need to counterbalance the secondary.  But with a thick
> enough spider
> you shouldn't have to.
> 
> Gene Horr
> 
> 
>      -----Original Message-----
>      From: astro-photo-bounces@seds.org
>      [mailto:astro-photo-bounces@seds.org]On Behalf Of
>      krausefam@att.net
>      Sent: 09/09/2005 9:02 PM
>      To: Astro-Photo@seds.org
>      Subject: [APML] Search for flexure and mirror movement info
> 
>      Hello All,
> 
>      I'm trying to get a newtonian to work with a guide scope.  I
>      must eliminate all flexure or mirror movement as much as
>      possible.  I have heard that some people have done this and
>      are successfully using newtonians with a guide scope.
>      However, I have had trouble finding how this was
>      accomplished on the internet.
> 
>      Does anyone know of a good comprehensive source of
>      information of how to track down and get rid of flexure and
>      mirror movement troubles, so that I can use a guide scope
>      with good results?
> 
>      Much thanks,
> 
>      Adam
> 
>     ---------------------------------------------------------------
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