Re: [ATM] Telescope Mounts

["marco miglionico" <marco.miglionico@blueyonder.co.uk>]

Equatorial platform. ("poncet mount").
They rock!

----- Original Message ----- 
From: "Kevin Whitefire" <chaosopher23@yahoo.com>
To: <atm@atmlist.net>
Sent: Tuesday, October 19, 2004 7:05 PM
Subject: [ATM] Telescope Mounts


> I think I've got it!
>
> German Equatorial Mounts have a huge disadvantage in
> that they have meridian reversal and are unstable with
> the weight on the top.  They are notoriously unstable
> with many points of weaknesses I'll not go into here.
>
> Yokes, English, and similar two-pier mounts are just
> plain huge, and the mounts can get in the way of
> observation without trying too hard.
>
> Springfield mounts are hard to fabricate, and
> tolerances have to be very close.  They are also
> massive.
>
> Fork mounts are something else altogether.  I like the
> concept.  They can have the strength of a two-pier
> system and have no meridian reversal, and they
> generally don't get in the way of themselves.  But
> they're notoriously huge and heavy, until now.
>
> I've developed what I think to be a very rigid and
> lightweight method for constructing a fork mount for
> my 8"f6.  So far, it can be transported in three
> sections, none of which are prohibitively heavy for
> one arm to carry.  The base is strong enough that I
> can stand on it (doing a balancing act) and it doesn't
> flex, yet it weighs 13 pounds.  The forks themselves
> weigh but 15 pounds, maybe less, and exhibit very good
> rigidity.  The telescope tube is an aluminum frame
> covered in 2 layers of cloth and weighs less than 15
> pounds with the glass installed.  The inside layer is
> black velvet and the outside layer is a star chart
> pattern.
>
> I will publish photos when I get the time and web
> space, and the bugs worked out.
>
> Bugs:  The ball and roller bearings used are very
> slick and I need a brake system on both axes.  I need
> a drive system on the RA.  I need a shelf to put my
> computer.  I need a power supply shelf.  I need an
> inverter - my Dell uses a 20v supply.  Primary
> material is still wood; I feel that welded aluminum
> will improve it greatly.
>
> Warm regards,
>
> Kevin of Eastern Iowa
> Seeker of the Darkness
>
>
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