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Finally made an R/C Collimation adapter

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#176 pfile

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Posted 04 August 2022 - 03:27 PM

on the 6, there is a "step" at the edge of the retaining ring on the outer side, so not a groove per-se. the diameter of the inside edge of the step is 56.6mm wide, and the step itself is 2mm wide. so i guess a 56mm, 3mm gasket might be appropriate? or should it be thicker to compress down more?

 

i guess the fact that the o-ring was not captive would explain how it might have gotten out.

 

rob



#177 ekallgren

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Posted 04 August 2022 - 05:29 PM

On my RC-8 Carbon the O-ring was rotten and weather checked and, falling off. 

When I reassembled the scope, I put and O-ring in, but it made the stars a weird shape, so I removed it and put it back together and that solved the weird shape of the stars.

I also tighten the mirror collar only enough so that the mirror will turn with some force applied.



#178 pfile

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Posted 04 August 2022 - 05:50 PM

yeah i have definitely pinched the secondary with the collimation screws so i can imagine the primary is just as sensitive.

 

rob



#179 nateman_doo

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Posted 04 August 2022 - 06:46 PM

Its impossible to "pinch" the secondary, it's glued in a housing. We have no interaction with it other than moving the secondary housing. As far as pinching the primary, that is possible, so just having the O-Ring and hand tighten until the mirror is secure and as said above would be able to rotate under force.

#180 pfile

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Posted 04 August 2022 - 07:54 PM

believe me it is a thing, pinching might not be what is happening technically for it but if you overtighten the secondary collimation screws you will end up with triangle-shaped stars. seen it with my own eyes on the 10.

 

rob



#181 nateman_doo

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Posted 04 August 2022 - 09:33 PM

I should correct myself and say nothing is impossible, but I can't imagine how much you have to torque them to distort the secondary cup.  Now when is that 10" going in a box and shipping my way?



#182 pfile

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Posted 04 August 2022 - 11:33 PM

i have the moonlite isolator on the 10" already... maybe one of the few people that have one i guess.

 

rob



#183 avarakin

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Posted 05 August 2022 - 12:06 AM

I owned 3 RC scopes and all of them had issues with the o-ring.

I recently bought these rings for my 8" :  https://www.amazon.c...e?ie=UTF8&psc=1

 

When you assemble the scope, make sure that the primary mirror is not pinched by the o-ring and can freely rotate in the cell. Otherwise I was getting weird star shapes.

 

Alex


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#184 Mert

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Posted 08 August 2022 - 01:02 PM

I owned 3 RC scopes and all of them had issues with the o-ring.

I recently bought these rings for my 8" :  https://www.amazon.c...e?ie=UTF8&psc=1

 

When you assemble the scope, make sure that the primary mirror is not pinched by the o-ring and can freely rotate in the cell. Otherwise I was getting weird star shapes.

 

Alex

Are you sure these were for the RC8? thinking1.gif

I've taken some measurements and it's certainly not 82 mm IMHO,

or am I mistaken where the O-ring has to go??

Attached Thumbnails

  • Primary retaining ring-CN.jpg

Edited by Mert, 08 August 2022 - 03:02 PM.


#185 Mert

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Posted 08 August 2022 - 01:26 PM

Here you see an image of the backside of the primary mirror

of my RC8 where the inside diameter is aprox. 66,4 mm

So the aprox. OD for the O-ring should be slightly bigger,

like the 68mm plus the thickness of the O-ring. ( aprox. 70 mm

OD and 67 mm ID so it sticks to the retainer. shrug.gif

There is also some double sided tape on the back of the mirror.

Attached Thumbnails

  • Backside mirror-CN.jpg

Edited by Mert, 08 August 2022 - 03:03 PM.


#186 nateman_doo

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Posted 08 August 2022 - 03:41 PM

Remember its not a perfect watertight seal.  Its just a physical bushing to prevent the miss-matching expansion of glass/aluminum from making contact with each other.  



#187 Larry Carlino

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Posted 08 August 2022 - 05:29 PM

Very nice!  My scope is actually a classical Cassegrainian.  I've had no trouble adjusting or keeping collimation.

LC



#188 Mert

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Posted 10 August 2022 - 02:04 PM

Yes, today I took delivery of my new tiltplate, looking nice!! waytogo.gif

I had to get myself another counterweight since I want

the weights to be closer to the center and also because

of the increased weight so that's done.

Tomorrow I'll get some O-rings to mount the mirror the

way it should before I start to assemble my scope again.

Will drop pics to show how it goes.

Ah, and my focusser threads on great!!

Attached Thumbnails

  • RC8 tiltplate-1.jpg

Edited by Mert, 10 August 2022 - 02:49 PM.

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#189 ekallgren

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Posted 10 August 2022 - 04:02 PM

Yes, today I took delivery of my new tiltplate, looking nice!! waytogo.gif

I had to get myself another counterweight since I want

the weights to be closer to the center and also because

of the increased weight so that's done.

Tomorrow I'll get some O-rings to mount the mirror the

way it should before I start to assemble my scope again.

Will drop pics to show how it goes.

Ah, and my focusser threads on great!!

Looking good Mert!  waytogo.gif  

I know you will be very happy with the new "Tilt Plate".

Mine brought the Monson Weather to Northern Nevada. We will have to wait and see what yours brings. lol.gif



#190 Mert

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Posted 11 August 2022 - 03:08 AM

Have you been able to test any further?
Just came back with a couple of O-rings that fit, so when I get time I'll start with it

#191 nateman_doo

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Posted 11 August 2022 - 07:17 AM

I finally have enough data to post an image of the fireworks galaxy. Now I just have to processes it.

#192 ekallgren

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Posted 11 August 2022 - 11:03 AM

I haven't been able to get any real data due to weather. It looks like it will clear up tonight, but the full moon will be a deterrent. 

Maybe do some narrowband.



#193 Mert

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Posted 11 August 2022 - 11:56 AM

Just plunked all together in a fast way and checked with the takahashi collimating

scope, a bit out of collimation it was, nothing to be worried about.

Also mounted the temperature probe in between the mirrorcell and the new

tilt plate.

For a first evaluation I just omitted the baffle tube, will dismount the mirror cell

again for a final cleaning, put the baffle tube inside the RC8 and do final collimation.

Looking very good already!

 

Attached Thumbnails

  • First mount and Takahashi.jpg
  • Temperature probe.jpg

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#194 nateman_doo

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Posted 11 August 2022 - 12:41 PM

Do you have the 1" baffle tube extension? I forgot. Don't put the scope back together without one.

#195 Mert

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Posted 11 August 2022 - 12:50 PM

What do you mean??

I only used the  1 inch to have a wider view with the takahashi collimating scope.

Right now I think I can't get any better.

It is really easy to adjust now, way better then before!!!

At least things are setup to start imaging whenever the clouds will clear :shrug:

 

 

 

Attached Thumbnails

  • Final collimation.jpg


#196 Mert

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Posted 11 August 2022 - 12:54 PM

And another image from the front with the laser collimator

shining to the center mark.

That was very easy and precise to adjust!

 

 

Attached Thumbnails

  • Adjusted laser to centermark.jpg


#197 Mert

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Posted 11 August 2022 - 12:57 PM

If my measurements are precise I have gained some 4 mm of focus travel

with the new tiltplate.

I used a 10mm extension tube, then the TS-tiltplate and then the focusser.

Now the 10mm extension and the TS-tiltplate are out of the optial train.

So the focusser goes straight onto the new tiltplate.

I need every mm for the reducer with rotator with filterdrawer to reach focus

and have enough range to autofocus during the night when temps drop.

When imaging with the CCDT67 reducer at F5.6 this telescope really

sucks in light!


Edited by Mert, 11 August 2022 - 12:59 PM.


#198 Mert

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Posted 11 August 2022 - 01:05 PM

Whenever there is an oportunity I will setup on my balcony

and do some ASTAP evaluations but I think the results

will be great from what I have seen doing the collimation.



#199 Mert

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Posted 11 August 2022 - 01:40 PM

Do you have the 1" baffle tube extension? I forgot. Don't put the scope back together without one.

What focusser do you use?

Mine is a Baader Diamond Steeltrack RT with 80mm of range



#200 nateman_doo

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Posted 11 August 2022 - 01:50 PM

SSf8q80l.jpg

This is a 1" extension I made.  People make them and 3d print them.  

 

So your sensor doesnt get any stray light:

https://i.imgur.com/MBnKSVnl.mp4


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