Re: 900GTO mount with stuck counterweight shaft


Sep 29, 2002

 


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

#5786 Sep 29, 2002

I've got a 900GTO mount, and the counterwieight shaft is "stuck"

inside the black counterweight shaft adapter on the DEC axis. When

I try to unscrew and remove the shaft, the black adapter comes off

instead. It's not cross threaded; it was screwed in about a

month or two ago, and has been thermally cycled over many days

while sitting under a tarp outdoors.



And tricks I can try to fix this, other than raw brute strength? It's

a little tough to get a grip on the parts. (Oh, and by the way, the

threads on the counterweight shaft adapter will cut your hands if

grab hold them without thinking..)



louie



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

#5788 Sep 29, 2002

Get some strap wrenches. You can get them at the auto parts store or, I just

saw a set of three at Costco. Basically they are little belts with handles.

They won't marr the finish and work great. You'll need two at least.



"Louis A. Mamakos" wrote:

> I've got a 900GTO mount, and the counterwieight shaft is "stuck"

> inside the black counterweight shaft adapter on the DEC axis. When

> I try to unscrew and remove the shaft, the black adapter comes off

> instead. It's not cross threaded; it was screwed in about a

> month or two ago, and has been thermally cycled over many days

> while sitting under a tarp outdoors.

>

> And tricks I can try to fix this, other than raw brute strength? It's

> a little tough to get a grip on the parts. (Oh, and by the way, the

> threads on the counterweight shaft adapter will cut your hands if

> grab hold them without thinking..)

>

> louie

>

> To UNSUBSCRIBE, or for general information on the ap-gto list

> see groups.yahoo.com/group/ap-gto

>

> Your use of Yahoo! Groups is subject to docs.yahoo.com/info/terms/



--

==

Greg Mueller Port Gamble, Washington

Amateur Astronomer, Machinist, Filmnut



Tech Tools and Astronomer's Gizmos

www.muellersatomics.com/

Homepage

users.silverlink.net/~mueller/

==



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

#5791 Sep 30, 2002

In a message dated 9/29/02 10:03:43 PM Eastern Daylight Time,

louie@... writes:



> And tricks I can try to fix this, other than raw brute strength? It's

> a little tough to get a grip on the parts. (Oh, and by the way, the

> threads on the counterweight shaft adapter will cut your hands if

> grab hold them without thinking..)

>



Louis,



Shock it, either thermally or by hitting it near the threads, it shouldn't

take all that much. The same thing happened to me a couple years ago. After

that a little oil on the threads cured that.



Dave



Web site: www.dpmessier.com



David Messier





[Non-text portions of this message have been removed]



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

#5792 Sep 30, 2002

The same thing happened to me a couple years ago. After

> that a little oil on the threads cured that.

>

>



You might try some stuff called "Never Seize". Its great for putting on stuff you

don't want to....well, seize up. You can probably find it at an industrial supply

store or an auto parts store. It's sort of the opposite of loc-tite



--

==

Greg Mueller Port Gamble, Washington

Amateur Astronomer, Machinist, Filmnut



Tech Tools and Astronomer's Gizmos

www.muellersatomics.com/

Homepage

users.silverlink.net/~mueller/

==







[Non-text portions of this message have been removed]



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

#5793 Sep 30, 2002

Check back in the archives. You'll see I had the same problem once. Rubber

strap wrenches did the trick.



Jeff



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

#5794 Sep 30, 2002

The "rubber strap" wrenches are truly invaluable for undoing 2" adapter

tubes that connect cameras, focal reducers, etc.



Richard





At 11:09 AM 9/30/2002 -0700, you wrote: >Check back in the archives. You'll see I had the same problem once. Rubber

>strap wrenches did the trick.

>

>Jeff

>

>

>

>To UNSUBSCRIBE, or for general information on the ap-gto list

>see groups.yahoo.com/group/ap-gto

>

>Your use of Yahoo! Groups is subject to docs.yahoo.com/info/terms/



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

#5795 Sep 30, 2002

This is a perennial problem (AP may want to take note). It happened to me

before the advent of strap wrenches and when I was at a remote site and

thus had no access to a vice (possibly 'vise' if you are west of the Azores

g>). If you are also somewhere where you do not have access to two strap

wrenches then you will need to improvise: stick a large allen key in the

hole in the black adapter (allen keys are a standard AP mount accessory).

Then wedge the black adapter under something heavy such that the allen key

locks against the ground or floor to stop turning motion. Then don your

rubber gloves (which should be a standard part of any astro kit) and with

the benefit of your added grip on the counterweight shaft, you will easily

be able to unscrew it.



--Philip





At 22:03 29/09/02 -0400, you wrote:

>I've got a 900GTO mount, and the counterwieight shaft is "stuck"

>inside the black counterweight shaft adapter on the DEC axis. When

>I try to unscrew and remove the shaft, the black adapter comes off

>instead. It's not cross threaded; it was screwed in about a

>month or two ago, and has been thermally cycled over many days

>while sitting under a tarp outdoors.

>

>And tricks I can try to fix this, other than raw brute strength? It's

>a little tough to get a grip on the parts. (Oh, and by the way, the

>threads on the counterweight shaft adapter will cut your hands if

>grab hold them without thinking..)

>

>louie







Philip Perkins - philip@...

Wiltshire UK & Luberon France

Astrocruise - www.astrocruise.com







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

#5800 Oct 1, 2002

--- In ap-gto@y..., Philip Perkins philip@a...> wrote:



I think this happens due to the dissimilar metals, alum and stainless

steel. Anyway I was warned way up front when Igot my ap-900 to grease

the CW shaft. Never a problem since.



Tim



> This is a perennial problem (AP may want to take note). It happened

to me

> before the advent of strap wrenches and when I was at a remote site and

> thus had no access to a vice (possibly 'vise' if you are west of the

Azores

> g>). If you are also somewhere where you do not have access to two

strap

> wrenches then you will need to improvise: stick a large allen key in

the

> hole in the black adapter (allen keys are a standard AP mount

accessory).

> Then wedge the black adapter under something heavy such that the

allen key

> locks against the ground or floor to stop turning motion. Then don

your

> rubber gloves (which should be a standard part of any astro kit) and

with

> the benefit of your added grip on the counterweight shaft, you will

easily

> be able to unscrew it.

>

> --Philip

>

>

> At 22:03 29/09/02 -0400, you wrote:

>

> >I've got a 900GTO mount, and the counterwieight shaft is "stuck"

> >inside the black counterweight shaft adapter on the DEC axis. When

> >I try to unscrew and remove the shaft, the black adapter comes off

> >instead. It's not cross threaded; it was screwed in about a

> >month or two ago, and has been thermally cycled over many days

> >while sitting under a tarp outdoors.

> >

> >And tricks I can try to fix this, other than raw brute strength? It's

> >a little tough to get a grip on the parts. (Oh, and by the way, the

> >threads on the counterweight shaft adapter will cut your hands if

> >grab hold them without thinking..)

> >

> >louie

>

>

>

> Philip Perkins - philip@a...

> Wiltshire UK & Luberon France

> Astrocruise - www.astrocruise.com



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

#5801 Oct 1, 2002

Per AP's suggestion, I put some oil between the dec and RA axis

assembly of my 900GTO to avoid "sticking" when they are assembled for

long periods..as is mine. I will now do the same thing with the

counter weight shaft! (may need to get those strap wrenches first!)



Also, along with my new RC, I got a number of "screw in adapters"..I

will do this with them as well (very carefully) since I will need to

add/remove these as necessary when using/not using the AP .75 reducer.

(I added the words "very carefully" so I avoid too much "oil" that

may end up on the camera/CFW8 optics...a little will go a long ways!)

Also, don't want things getting too loose..still need a tight fit,

but with the ability to make changes.



Randy Nulman

--- In ap-gto@y..., "Tube Tim" potentate@c...> wrote:

> --- In ap-gto@y..., Philip Perkins philip@a...> wrote:

>

> I think this happens due to the dissimilar metals, alum and

stainless

> steel. Anyway I was warned way up front when Igot my ap-900 to

grease

> the CW shaft. Never a problem since.

>

> Tim

>

> > This is a perennial problem (AP may want to take note). It

happened

> to me

> > before the advent of strap wrenches and when I was at a remote

site and

> > thus had no access to a vice (possibly 'vise' if you are west of

the

> Azores

> > g>). If you are also somewhere where you do not have access to

two

> strap

> > wrenches then you will need to improvise: stick a large allen key

in

> the

> > hole in the black adapter (allen keys are a standard AP mount

> accessory).

> > Then wedge the black adapter under something heavy such that the

> allen key

> > locks against the ground or floor to stop turning motion. Then

don

> your

> > rubber gloves (which should be a standard part of any astro kit)

and

> with

> > the benefit of your added grip on the counterweight shaft, you

will

> easily

> > be able to unscrew it.

> >

> > --Philip

> >

> >

> > At 22:03 29/09/02 -0400, you wrote:

> >

> > >I've got a 900GTO mount, and the counterwieight shaft is "stuck"

> > >inside the black counterweight shaft adapter on the DEC axis.

When

> > >I try to unscrew and remove the shaft, the black adapter comes

off

> > >instead. It's not cross threaded; it was screwed in about a

> > >month or two ago, and has been thermally cycled over many days

> > >while sitting under a tarp outdoors.

> > >

> > >And tricks I can try to fix this, other than raw brute

strength? It's

> > >a little tough to get a grip on the parts. (Oh, and by the way,

the

> > >threads on the counterweight shaft adapter will cut your hands if

> > >grab hold them without thinking..)

> > >

> > >louie

> >

> >

> >

> > Philip Perkins - philip@a...

> > Wiltshire UK & Luberon France

> > Astrocruise - www.astrocruise.com







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