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GOTO Hy-Score 4" Refractor

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#1 twmiller

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Posted 16 October 2013 - 12:42 PM

I just purchased a GOTO Hy-Score Refractor from around 1957. It is actually in very good shape considering it is 50 years old. The baffles are out of the tube and I need to know the correct spacing to install them. Does anyone have any knowledge about this subject?

Thanks,

Buddy

#2 madeline

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Posted 16 October 2013 - 01:08 PM

Buddy, please post some pictures. Alot of them.

#3 bremms

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Posted 16 October 2013 - 03:13 PM

Pics please yes! I have a 2.5 inch GOTO F20 from 1960

#4 Joe Cepleur

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Posted 16 October 2013 - 03:22 PM

Welcome, twmiller! Yes, pictures, please.

Someone here will know the answer to your question. I'd speculate that the baffles will be evenly spaced along the tube.

#5 madeline

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Posted 16 October 2013 - 03:35 PM

I wonder why the baffels are out of the tube?

#6 Terra Nova

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Posted 16 October 2013 - 03:46 PM

Gotos are wonderful scopes. You are lucky to have one. They are quite rare here in the states. Excited to see pictures.

#7 fjs

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Posted 16 October 2013 - 03:49 PM

The baffles are out of the tube and I need to know the correct spacing to install them. Does anyone have any knowledge about this subject?


I have only the required little knowledge in order to be dangerous. Others could probably do better!

What I would do, providing you cannot see marks in the tube where they obviously would go, is this:

1. Aim the scope at a distant object, swapping out all my eyepieces until I found the one requiring the focuser to be racked out the most. Do not move the focuser knobs after this.
2. Clear everything off the dining room table....Don't worry I'll wait. :4

3. Get a sheet of paper as long as the entire scope (I think you can see where this is going).

4. Yes, make a drawing of the tube inside diameter.

5. Remove the focuser and measure the amount the drawtube is inserted into the tube. Your drawing should end up being a rectangle as tall as the tube ID and as wide as the distance from the objective to the forward edge of the drawtube.

6. Measure the ID of the drawtube and mark that diameter centered at one of the ends of your drawing.

7. Now draw diagonal lines from the open end of the 'tube' to the marks representing the drawtube ID. You should end up with a long skinny truncated cone or pyramid shape.

8. It will now be the time to see where the inner diameters of the baffles are equal to the width of the angled lines. That is where they should go in your tube.

You can check your work by temporarily installing them and peering through the focuser. If you can see the entire open end, but no part of the tube walls, you are good to go.

Hope this helps! If not... :step:

#8 Happy-Idiot

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Posted 16 October 2013 - 04:44 PM

Here are some links:
IM BAFFLED and Refractor baffling and another

But I agree that your best bet is to look for discolored rings inside the tube where the light shields once were.

#9 fjs

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Posted 16 October 2013 - 04:44 PM

addendum #1: I bet you'll find the manufacturer really didn't put enough baffles in there. Only the most fastidious do.

#10 fjs

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Posted 16 October 2013 - 04:47 PM

addendum #2: Yes, you must post photos. Posting of photos, and figuring out how to do so, is part of the price of admission here. I e-mail them to myself and then post the result.

#11 fjs

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Posted 16 October 2013 - 05:20 PM

Them's some good links Brian. I like this second generation one: http://www.berfield.com/baffles.html

#12 clintwhitman

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Posted 16 October 2013 - 11:55 PM

Send me the scope and I will make a full scale Ray Trace drawing, Install all the baffles and spray 2 cans of ultra flat black paint into the tube to hold it all in place. :lol: works like a charm.

#13 strdst

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Posted 17 October 2013 - 12:03 AM

addendum #1: I bet you'll find the manufacturer really didn't put enough baffles in there. Only the most fastidious do.


I'll take that bet :lol:

A view inside of my 3" Goto...

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#14 fjs

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Posted 17 October 2013 - 12:08 AM

:foreheadslap: Too late to retract, no doubt!

#15 strdst

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Posted 17 October 2013 - 12:26 AM

:foreheadslap: Too late to retract, no doubt!


:lol: Never too late.

And the view of the outside of that Goto...

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#16 Terra Nova

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Posted 17 October 2013 - 06:38 AM

That telescope is amazing Keith. The mounts are so unusual and so stable. Wow! Beautiful :bow:

#17 bremms

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Posted 17 October 2013 - 07:12 AM

Love those mounts.. I wanted to make one like that for a larger refractor. It got a bit bulky when scaled(rough drawings) up. Maybe Ill draw it up in Inventor. It has the advantage of being "between" the dec bearings.

#18 twmiller

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Posted 17 October 2013 - 10:47 AM

Here are some pictures of the scope

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#19 twmiller

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Posted 17 October 2013 - 10:56 AM

Sorry, evidently I can only post one image at a time. I can't figure out how to post multiple images.

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#20 jjbird

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Posted 17 October 2013 - 04:50 PM

Absolutely beautiful scope!

#21 Wisconsin Steve

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Posted 17 October 2013 - 07:14 PM

Fantastic looking scope!
Steve

#22 twmiller

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Posted 18 October 2013 - 12:19 AM

Thanks, Clint for the offer. I am going to give it a shot as I have since found several resources on the subject.

Best regards,

Buddy

#23 twmiller

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Posted 18 October 2013 - 12:33 AM

Hi Terra,

I feel lucky to have one. I am itching to get a look at Jupiter through this scope as the f/14.7 ratio is well suited to planetary observation. The ED objective is pristine. I have found several resources (in researching and with some help from other members)on the tube baffling subject and will make an attempt to get the baffles installed and spaced correctly.
Thanks for your response and I look forward to future correspondence.

Best regards,

Buddy

#24 clintwhitman

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Posted 18 October 2013 - 03:11 AM

Buddy are you friends with Richard F Savignano in Seekonk MA? He is one of you group and a master telescope restorer.


#25 starman876

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Posted 18 October 2013 - 08:50 AM

That scope looks like it is on a Unitron mount. Maybe I need to be educated on GO TO scopes.


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