Re: 1200gto: maximum load?


Apr 1, 2005

 


----------------------------

#12474 Apr 1, 2005

Hi all,



I know this has probably been answered before

but...what is the load capacity of the 1200GTO?



I have heard that this depends on the moment arm(?)

of the load in question. The load in this question

would be a 20" f/4.3 newtonian astrograph weighing

in at around 120 lbs. To be used in an observatory,

never in the wind, for imaging only. Can I do it?



thanks,

Mike Connors



----------------------------

#12479 Apr 3, 2005

Mike,

I have a 900 (not a 1200), but have followed "weight" threads on the

1200 in anticipation of a possible upgrade. From what I remember, and

the fact that your scope doesn't have a very long moment arm

(relatively speaking G>), I don't see any reason why the 1200 won't

handle your scope quite nicely...assuming reasonable balance. I'm

also assuming that you won't put any "somewhat heavy" refractor on top

of the newtonian...that would start to create the "moment arm" issues

you referred to.



Just my 2 cents,

Randy Nulman

www.nulman.darkhorizons.org





--- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

wrote: >

> Hi all,

>

> I know this has probably been answered before

> but...what is the load capacity of the 1200GTO?

>

> I have heard that this depends on the moment arm(?)

> of the load in question. The load in this question

> would be a 20" f/4.3 newtonian astrograph weighing

> in at around 120 lbs. To be used in an observatory,

> never in the wind, for imaging only. Can I do it?

>

> thanks,

> Mike Connors



----------------------------

#12480 Apr 3, 2005

Mike,



I run about 120lbs on my AP 1200 mount. Do not have an issue at all with

imaging.

I do use the longer 28" counter weight shaft though with (5) 18lb AP

weights



www.aajonahfish.com/FRC300NEWSet-up/FRCNETSetup.jpg



Mark

www.aajonahfish.com/astronomyhaven.htm

N 27. 52' 20"

W 082. 28' 57"









--- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

wrote: >

> Hi all,

>

> I know this has probably been answered before

> but...what is the load capacity of the 1200GTO?

>

> I have heard that this depends on the moment arm(?)

> of the load in question. The load in this question

> would be a 20" f/4.3 newtonian astrograph weighing

> in at around 120 lbs. To be used in an observatory,

> never in the wind, for imaging only. Can I do it?

>

> thanks,

> Mike Connors



----------------------------

#12482 Apr 3, 2005

Randy,



Thanks for the reassurance.

Somehow I got fixated on the dec axis only, ignoring the RA.

Well, good. Now I can do something silly with confidence ; )





Mike Connors



--- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...> wrote:

>

> Mike,

> I have a 900 (not a 1200), but have followed "weight" threads on

the

> 1200 in anticipation of a possible upgrade. From what I remember,

and

> the fact that your scope doesn't have a very long moment arm

> (relatively speaking G>), I don't see any reason why the 1200

won't

> handle your scope quite nicely...assuming reasonable balance. I'm

> also assuming that you won't put any "somewhat heavy" refractor on

top

> of the newtonian...that would start to create the "moment arm"

issues

> you referred to.

>

> Just my 2 cents,

> Randy Nulman

> www.nulman.darkhorizons.org

>

>

> --- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

> wrote:

> >

> > Hi all,

> >

> > I know this has probably been answered before

> > but...what is the load capacity of the 1200GTO?

> >

> > I have heard that this depends on the moment arm(?)

> > of the load in question. The load in this question

> > would be a 20" f/4.3 newtonian astrograph weighing

> > in at around 120 lbs. To be used in an observatory,

> > never in the wind, for imaging only. Can I do it?

> >

> > thanks,

> > Mike Connors



----------------------------

#12483 Apr 3, 2005

Hi, Mark



That's a nice setup you have there.

Wish I could do the same, but then if I could,

there would be no question about a big newt on a 1200 g>.

The 28" shaft sounds like the way to go.

Glad to know you have neared the limits of weight and

have had no issues.



Thank You,



Mike Connors





--- In ap-gto@yahoogroups.com, "aajohnah" aajohnah@t...> wrote:

> Mike,

>

> I run about 120lbs on my AP 1200 mount. Do not have an issue at

all with

> imaging.

> I do use the longer 28" counter weight shaft though with (5) 18lb

AP

> weights

>

> www.aajonahfish.com/FRC300NEWSet-up/FRCNETSetup.jpg

>

> Mark

> www.aajonahfish.com/astronomyhaven.htm

> N 27. 52' 20"

> W 082. 28' 57"

>

>

>

>

> --- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

> wrote:

> >

> > Hi all,

> >

> > I know this has probably been answered before

> > but...what is the load capacity of the 1200GTO?

> >

> > I have heard that this depends on the moment arm(?)

> > of the load in question. The load in this question

> > would be a 20" f/4.3 newtonian astrograph weighing

> > in at around 120 lbs. To be used in an observatory,

> > never in the wind, for imaging only. Can I do it?

> >

> > thanks,

> > Mike Connors







----------------------------

#12486 Apr 4, 2005

Mike,

You'll want to be reasonably balanced in dec (maybe just

slightly "backside" weighted when all the equip/camera are

on)...just move the scope forward or backwards to achieve dec

balance. Of course, in RA, it's always best to be

slightly "eastside" weighted to insure the gears always

remain "meshed" as the RA pushes forward. This usually involves

finding a pure balance using the appropriate counter weights..then,

if the scope is on the east side, move one of the weights "up" a bit

on the shaft (now the scope side will be slightly east heavy) and

conversely if the scope is on the west side of the mount, move a

counter weight "down" to maintain a slight weight bias to the east.



Randy Nulman

www.nulman.darkhorizons.org





--- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

wrote: >

> Randy,

>

> Thanks for the reassurance.

> Somehow I got fixated on the dec axis only, ignoring the RA.

> Well, good. Now I can do something silly with confidence ; )

>

>

> Mike Connors

>

>

> --- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...>

wrote: > >

> > Mike,

> > I have a 900 (not a 1200), but have followed "weight" threads on

> the

> > 1200 in anticipation of a possible upgrade. From what I

remember, > and

> > the fact that your scope doesn't have a very long moment arm

> > (relatively speaking G>), I don't see any reason why the 1200

> won't

> > handle your scope quite nicely...assuming reasonable balance.

I'm > > also assuming that you won't put any "somewhat heavy" refractor

on > top

> > of the newtonian...that would start to create the "moment arm"

> issues

> > you referred to.

> >

> > Just my 2 cents,

> > Randy Nulman

> > www.nulman.darkhorizons.org

> >

> >

> > --- In ap-gto@yahoogroups.com, "connomj39060"

connomj39060@y...> > > wrote:

> > >

> > > Hi all,

> > >

> > > I know this has probably been answered before

> > > but...what is the load capacity of the 1200GTO?

> > >

> > > I have heard that this depends on the moment arm(?)

> > > of the load in question. The load in this question

> > > would be a 20" f/4.3 newtonian astrograph weighing

> > > in at around 120 lbs. To be used in an observatory,

> > > never in the wind, for imaging only. Can I do it?

> > >

> > > thanks,

> > > Mike Connors



----------------------------

#12489 Apr 4, 2005

Incidentally, on my 900GTO, with my RC, accessories, camera, etc..I

probably have close to 50 to 55 lbs on the mount. (This is reaching

the "safe" imaging weight limit of the 900). However, with

everything balanced as described below, I have absolutely no

problems in any area...especially guiding. (In fact, on a typical

seeing night for me of around 2.8 arcsec focus stars, I get no

better result when using an AO unit than just straight guiding...the

mount works like a charm)



HTH,

Randy Nulman

www.nulman.darkhorizons.org



--- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...> wrote:

>

> Mike,

> You'll want to be reasonably balanced in dec (maybe just

> slightly "backside" weighted when all the equip/camera are

> on)...just move the scope forward or backwards to achieve dec

> balance. Of course, in RA, it's always best to be

> slightly "eastside" weighted to insure the gears always

> remain "meshed" as the RA pushes forward. This usually involves

> finding a pure balance using the appropriate counter

weights..then,

> if the scope is on the east side, move one of the weights "up" a

bit

> on the shaft (now the scope side will be slightly east heavy) and

> conversely if the scope is on the west side of the mount, move a

> counter weight "down" to maintain a slight weight bias to the east.

>

> Randy Nulman

> www.nulman.darkhorizons.org

>

>

> --- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

> wrote:

> >

> > Randy,

> >

> > Thanks for the reassurance.

> > Somehow I got fixated on the dec axis only, ignoring the RA.

> > Well, good. Now I can do something silly with confidence ; )

> >

> >

> > Mike Connors

> >

> >

> > --- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...>

> wrote:

> > >

> > > Mike,

> > > I have a 900 (not a 1200), but have followed "weight" threads

on

> > the

> > > 1200 in anticipation of a possible upgrade. From what I

> remember,

> > and

> > > the fact that your scope doesn't have a very long moment arm

> > > (relatively speaking G>), I don't see any reason why the 1200

> > won't

> > > handle your scope quite nicely...assuming reasonable balance.

> I'm

> > > also assuming that you won't put any "somewhat heavy"

refractor

> on

> > top

> > > of the newtonian...that would start to create the "moment arm"

> > issues

> > > you referred to.

> > >

> > > Just my 2 cents,

> > > Randy Nulman

> > > www.nulman.darkhorizons.org

> > >

> > >

> > > --- In ap-gto@yahoogroups.com, "connomj39060"

> connomj39060@y...>

> > > wrote:

> > > >

> > > > Hi all,

> > > >

> > > > I know this has probably been answered before

> > > > but...what is the load capacity of the 1200GTO?

> > > >

> > > > I have heard that this depends on the moment arm(?)

> > > > of the load in question. The load in this question

> > > > would be a 20" f/4.3 newtonian astrograph weighing

> > > > in at around 120 lbs. To be used in an observatory,

> > > > never in the wind, for imaging only. Can I do it?

> > > >

> > > > thanks,

> > > > Mike Connors







----------------------------

#12506 Apr 5, 2005

Randy,



Thanks for these followups.

I think it'll be OK, what I'm planning.

Nice to here about your experience, though.

Really don't want an AO if it can be avoided,

since it may be a bit of a hassle with a newt's backfocus.



clear skies,



Mike Connors



--- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...> wrote:

>

> Incidentally, on my 900GTO, with my RC, accessories, camera, etc..I

> probably have close to 50 to 55 lbs on the mount. (This is

reaching

> the "safe" imaging weight limit of the 900). However, with

> everything balanced as described below, I have absolutely no

> problems in any area...especially guiding. (In fact, on a typical

> seeing night for me of around 2.8 arcsec focus stars, I get no

> better result when using an AO unit than just straight

guiding...the

> mount works like a charm)

>

> HTH,

> Randy Nulman

> www.nulman.darkhorizons.org

>

>

> --- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...>

wrote:

> >

> > Mike,

> > You'll want to be reasonably balanced in dec (maybe just

> > slightly "backside" weighted when all the equip/camera are

> > on)...just move the scope forward or backwards to achieve dec

> > balance. Of course, in RA, it's always best to be

> > slightly "eastside" weighted to insure the gears always

> > remain "meshed" as the RA pushes forward. This usually involves

> > finding a pure balance using the appropriate counter

> weights..then,

> > if the scope is on the east side, move one of the weights "up" a

> bit

> > on the shaft (now the scope side will be slightly east heavy) and

> > conversely if the scope is on the west side of the mount, move a

> > counter weight "down" to maintain a slight weight bias to the

east.

> >

> > Randy Nulman

> > www.nulman.darkhorizons.org

> >

> >

> > --- In ap-gto@yahoogroups.com, "connomj39060" connomj39060@y...>

> > wrote:

> > >

> > > Randy,

> > >

> > > Thanks for the reassurance.

> > > Somehow I got fixated on the dec axis only, ignoring the RA.

> > > Well, good. Now I can do something silly with confidence ; )

> > >

> > >

> > > Mike Connors

> > >

> > >

> > > --- In ap-gto@yahoogroups.com, "Randy Nulman" rj.nulman@v...>

> > wrote:

> > > >

> > > > Mike,

> > > > I have a 900 (not a 1200), but have followed "weight" threads

> on

> > > the

> > > > 1200 in anticipation of a possible upgrade. From what I

> > remember,

> > > and

> > > > the fact that your scope doesn't have a very long moment arm

> > > > (relatively speaking G>), I don't see any reason why the

1200

> > > won't

> > > > handle your scope quite nicely...assuming reasonable

balance.

> > I'm

> > > > also assuming that you won't put any "somewhat heavy"

> refractor

> > on

> > > top

> > > > of the newtonian...that would start to create the "moment

arm"

> > > issues

> > > > you referred to.

> > > >

> > > > Just my 2 cents,

> > > > Randy Nulman

> > > > www.nulman.darkhorizons.org

> > > >

> > > >

> > > > --- In ap-gto@yahoogroups.com, "connomj39060"

> > connomj39060@y...>

> > > > wrote:

> > > > >

> > > > > Hi all,

> > > > >

> > > > > I know this has probably been answered before

> > > > > but...what is the load capacity of the 1200GTO?

> > > > >

> > > > > I have heard that this depends on the moment arm(?)

> > > > > of the load in question. The load in this question

> > > > > would be a 20" f/4.3 newtonian astrograph weighing

> > > > > in at around 120 lbs. To be used in an observatory,

> > > > > never in the wind, for imaging only. Can I do it?

> > > > >

> > > > > thanks,

> > > > > Mike Connors



Contact Us
This Site's Privacy Policy
Google's privacy policies

S
e
n
i
o
r
T
u
b
e
.
o
r
g