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Need ideas on how to repair Sega hologram parabolic mirror

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RandyT:


--- Quote from: J-Rod on December 20, 2005, 11:21:48 am ---I am siding with Avery on this. Here's what I would do. From the appearance of that crack, I wouldn't go messing with any form of heat at all. Glue it back together with a black sandable epoxy. When it glues together, there will be raised portions of epoxy. Get some fine grit sandpaper, and wet sand it slowly back down, being careful not to take material off the surface, but with a fine grit that shouldn't be too much of a problem. Then get yourself some scratch filler, I would think you could use the stuff that fixes scratched CDs, or possibly even some wax, to fill in the small scratches and get the finish back to a high gloss. My $.02 on the matter.

Perhaps something like this - http://www.koalaproducts.net/polish.htm

--- End quote ---


Optics aren't car bodies.  Hand grinding a curve that is accurate enough for optical use is nearly impossible.

Also, transmissive optics are very different from reflective ones.  You can get away with murder on the transmissive ones, but not reflective or "imaging" optics.

But hey, if someone is really bored it might make a good waste of a weekend  ;)

RandyT

J-Rod:

Yeah maybe, I think it is worth a shot though, as it's already broken. He's not going to make it *worse* by trying to glue and wetsand. And as far as it being optical quality, look at the picture. It's already got a decent amount of scratching, this isn't going into a telescope...

As long as he's careful about sanding into the material too much, there's not going to be crazy distortion from a 1000 grit wetsand. Look at the polish the plexiglass took.




RandyT:


--- Quote from: J-Rod on December 20, 2005, 11:35:29 am ---And as far as it being optical quality, look at the picture. It's already got a decent amount of scratching, this isn't going into a telescope...



--- End quote ---




I guess you didn't see the part where I wrote:


--- Quote from: RandyT on December 20, 2005, 11:30:35 am ---Also, transmissive optics are very different from reflective ones. You can get away with murder on the transmissive ones, but not reflective or "imaging" optics.

--- End quote ---

It's not going in a "storm door" either.  And FYI, optics similar to these are used in telescopes.  How do you think they collect the tiny amount of light from stars billions of miles away and focus it on a small receiver?  This application is not as critical, for sure, but the function of the optic is very similar.

RandyT

ChadTower:


How do you glue something together that is not physically separated?  To get glue in there he would have to find a way to get separation into which he can put the glue... plus, it's not BROKEN, it is a visual reflectivity issue.  You aren't going to be able to be visually rid of a crack by gluing it.

TravistyOJ:

Im sorry I should clarify the problem.  There are 2 cracks, one long one, and one short one that intersects into the other, making a small triangular piece that broke off.   Right now it is all being held together with tape. 

What if used some sort of glue and pressed together to minimize the seam, and then took some novus deep scratch remover on the seams, and then a couple layers of novus polish?

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