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tube repair question

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#1 donnie3

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Posted 01 December 2013 - 05:54 PM

I have a orion 8" intelliscope and was wondering if anyone has a idea of how to repair scratches on the tube. I have seen special paste or liquids that you rub on then wipe off, I tried some I got at walmart but it didn't help. repaint, paint over, not sure what would be the best method. I would appreciate some advice please. thanks, donnie

#2 BDS316

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Posted 01 December 2013 - 06:42 PM

The options depend on how much of a perfectionist you are. I've tried everything from Sharpies to auto store car touch up paint to pretty stickers to cover up the scratches. The stickers from the Astronomical league are nice as are those from Astronomers without Boarders and the "Powered by Televue" stickers are great for small scratches. If you go to NEAF, you can get tons of free stickers of all sizes.

Here are some stickers from Televue, RGS Associates, Astronomical League, and the Planetary Society.

http://www.astrogood...e.goldeneye.jpg

Another solution would be to remove everything from the tube and have it powdercoated or take it to an auto body shop for a professional repaint. $$$$$$$


I think the important thing to keep in mind, and it took me years to finally believe this, is that the scratches are purely cosmetic and in no way affect the performance of the scope, and no one sees tube scratches in the dark.

Tom Clark said in the Modern Dobsonian page 56 " These.. telescopes are tools that will hopefully receive hard use. They will quickly gather battle scars as we travel around.. committing astronomy. Each time you load and unload there are many opportunities for more dents, dings, (scratches,) scrapes and bruises.

Think about it. Of course, if you have a telescope that you never plan to use, but only display, then make it as pretty as you want. "

#3 schluterdude

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Posted 01 December 2013 - 07:59 PM

Every scratch and ding tells a story...

"I got this one the night I resolved the banding on Jupiter!"

Or

"This one is from the night a babe was checking out my OTA!"

You've always got to find the silver lining! There are obvious differences in blemishes that result from rough handling as opposed to use. Wear those scuffs and scratches like badges of honor!

#4 Sean Wood

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Posted 01 December 2013 - 08:14 PM

Stickers add a nice touch of personalization...

Ebay search for TELESCOPE STICKERS

#5 choran

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Posted 01 December 2013 - 09:05 PM

I tend toward advising no repair on scratches. Short of huge effort, no repair will look like the original surface. If you ever want to sell it, often times paint touch-up, even done fairly well, tends to lessen the value. Like small dings on a car, scratches are inevitable. Nothing wrong with a scope that shows its use--keep it clean, well maintained, accurately collimated, and functioning properly. To heck with the scratches.
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#6 john gabriel

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Posted 01 December 2013 - 09:29 PM

I bough a used white tube scope that had several scuffs and scratches - some of them were marked by darkened lines. Most (most!) came out very nicely using a little light application of auto-body rubbing compound. It just depends on how deep your scratches are. Some of my results surprised me rather pleasantly where the scratch looked worse than it turned out to be.

My 2 cents!
John

#7 Pinbout

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Posted 01 December 2013 - 10:21 PM

If you want to repaint it, you can choose something that if it scratches again you can hit it with some paint again. I would sand the paint with a 220 and paint it with a textured paint, like a televue scope.

#8 donnie3

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Posted 02 December 2013 - 12:02 AM

pinbout, I like your suggestion, thanks.

#9 kfrederick

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Posted 02 December 2013 - 07:02 AM

http://solutions.3m....roducts/Seri...

#10 BDS316

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Posted 02 December 2013 - 07:21 AM

http://solutions.3m....roducts/Seri...


Interesting. Anyone have a pic of a scope with this applied?

#11 Pinbout

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Posted 02 December 2013 - 12:15 PM

I had a 4.5" reflector I wanted to make a scope with so I downloaded a graphite texture and made this in illustrator.

Posted Image

the I printed it ~40x25 and applied the print with glue...

Posted Image

Posted Image

#12 donnie3

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Posted 02 December 2013 - 10:00 PM

I just bought some nice stickers at hobby lobby and put some over the scratches. it does a good job of hiding them.

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#13 donnie3

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Posted 02 December 2013 - 10:12 PM

I took the intelliscope encoders off the 8" and applied them to my 10" orion sky quest classic, sure wish I could find some more encoders to put back on the 8". the tube on the 8" is not the original scope the came with the dob, I had a 1000mm 8" orion st that I bought a while back because of the wider fov (its really a nice ota) so I took the hubs off the 1200mm tube and applied them to the 1000mm. it worked out real fine but with the sky glow here in my city, I need go to or push to. donnie

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#14 hottr6

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Posted 03 December 2013 - 11:43 AM

Another solution would be to remove everything from the tube and have it powdercoated or take it to an auto body shop for a professional repaint. $$$$$$$

Powdercoating may look nice and appear to be indestructible, but it adds a lot of weight to the tube and slows cooling.

Also as an aside, auto paint is the best paint you can buy, period. It is designed for applying to thin metal that expands and contracts, and is more resistant to sun damage than any other type of paint. Now you know why auto paint is expensive, and expensive paint deserves correct surface preparation that for non-DIYers, translates into much mo' money.

#15 BSeward

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Posted 03 December 2013 - 06:57 PM

Patina.... The scuffs and marks show the instrument was used and enjoyed. That crack down the center of the primary mirror, however, is a different story...






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