Hi Dr Clay,
Thanks!! The penny just dropped a minute or two before your reply whilst viewing
this link,
http://www.dfmengineering.com/news_observatory_design.html#pier_location
Cheers.

Jeff.



--- In lx90@yahoogroups.com, "P. Clay Sherrod" <drclay@...> wrote:
>
> The pier should not be dead center in the observatory with a fork mount; for
the LX90, the
> offset of the pier should be about 10-12" south of center. The overall weight
(torque) of
> the scope leaning out from a wedge does not change, provided that the length
of the fork
> arms do not change. If you put the pier dead center in the room, you will be
very cramped
> to the north side of the pier.
>
> Dr. Clay
> _____
> Arkansas Sky Observatories
> MPC H45 - Petit Jean Mountain South
> MPC H41 - Petit Jean Mountain
> MPC H43 - Conway West
> http://www.arksky.org/
>
> ----- Original Message -----
> From: "stargazerlx90" <stargazerlx90@...>
> To: <lx90@yahoogroups.com>
> Sent: Saturday, July 11, 2009 8:57 AM
> Subject: [lx90] Re: Pier offset
>
>
> > Hi Fernando,
> > Thanks for your response.
> > But i thought the weight of the scope on any wedge will be the same no
matter how long
> > the gap is between the centres of a wedge, and providing enough
reinforcement is made to
> > fully compensate for the slightly extra length of the wedge i really can't
see it being
> > a problem?
> > This will mean the pier remains dead centre of the observatory with no
offset needed
> > just in case i should have any clearance problems if I'm correct.
> >
> > Jeff.
> >
> >
> >
> > --- In lx90@yahoogroups.com, Fernando Campuzano <fcampuzano25@> wrote:
> >>
> >> Hi Jeff.
> >> Just a doubt. Why do you want the centre of the DEC axis being alligned
with the centre
> >> of the pier?. Shouldn't be the ideal situation with the gravity centre of
the whole
> >> setup (scope and wedge) being alligned with the pier? The centre of the DEC
axis will
> >> be just the centre for the balance of the OTA with all of its accesories
(cameras,
> >> guide tube, counterweights,etc). The extra weight from the fork arms, wedge
and the
> >> base of the scope would be tensioning the attachments bolts of the wedge to
the pier,
> >> and maybe introducing some pier flexure..?
> >> Fernando
> >>
> >>
> >>
> >>
> >>
> >> ________________________________
> >> De: stargazerlx90 <stargazerlx90@>
> >> Para: lx90@yahoogroups.com
> >> Enviado: sábado, 11 de julio, 2009 10:30:13
> >> Asunto: [lx90] Re: Pier offset
> >>
> >>
> >>
> >>
> >>
> >> Hi,
> >> Just wondering if anyone can help with this info i need as i don't have my
scope with
> >> me at the moment.
> >> What I'm actually looking for is a distance between the centre of the
pier/wedge
> >> mounting bolt to the centre of the DEC axis when the angle is set to a
Latitude of
> >> 37.3, the idea is that the Dec axis automatically centres over the pier
centre when set
> >> at this Lat.
> >>
> >> If i then construct a wedge with these measurements it will mean i don't
need to have a
> >> pier offset i think, am i correct with this assumption please any takers?
> >>
> >> Thanks all.
> >>
> >> Jeff.
> >>
> >> --- In lx90@yahoogroups. com, "stargazerlx90" <stargazerlx90@ ...> wrote:
> >> >
> >> > Sorry that should read "so the 'pier' is still centred in the
observatory" .
> >> >
> >> > Jeff.
> >> >
> >> >
> >> >
> >> >
> >> > --- In lx90@yahoogroups. com, "stargazerlx90" <stargazerlx90@ > wrote:
> >> > >
> >> > > Would someone be able to work out what the pier offset is for a Lat of
37.352?
> >> > > I want to costruct a wedge for a 12" lx90 but make the offset distance
correspond
> >> > > to the centre of the mounting bolt so the scope is still centred in the
> >> > > observatory. Does this make sense?
> >> > > I think it was 13 3/4" at that lat from memory but could be way out!!
> >> > >
> >> > > Many thanks.
> >> > >
> >> > > Clear skies.
> >> > >
> >> > > Jeff.
> >> > >
> >> >
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >> [Non-text portions of this message have been removed]
> >>
> >
> >
> >
> >
> > ------------------------------------
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> >
> >
> >
> >
>