| Mirror coating ideas? [message #17493] Thu, 09 September 2010 12:43 UTC |
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Hi!
I'd like to print a relatively simple 3D object, say a 3D parabola, and then coat it with something to make the surface reflective. It should have mirror-like reflectivity, though quality does not have to be very good. Smallest bending radius would probably in the meter range.
Does anybody have an idea if of a method to coad or glue on mirrors?
Thanks in advance!
http://www.shapeways.com/shops/frolands
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| Re: Mirror coating ideas? [message #17496 is a reply to message #17493 ] Thu, 09 September 2010 13:37 UTC |
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Best way I can think of offhand is to give it a chrome finish. Alclad produce a range of lacquer-based paints which give a really nice metal finish, and among them is a gorgeous chrome lacquer. You need to apply it over a gloss black or dark grey base coat, and it's best sprayed (the bottle's formulated to be used in an airbrush, and they also produce spray cans). The finished result, if done properly, pretty much produces a mirror shine.
Here's a YouTube video of the stuff in use to show how it's done.
Hope that helps.
Andy
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| Re: Mirror coating ideas? [message #17497 is a reply to message #17496 ] Thu, 09 September 2010 13:50 UTC |
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Depending where you are, there are some telescope manufacturers the offer mirror recoating services. They use a vacuum process to coat the surface with a front surface mirror. Some kaleidoscope makers have them too.
Would be fairly high quality though, depending of course on underlying surface.
Duann Scott
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| Re: Mirror coating ideas? [message #17821 is a reply to message #17493 ] Thu, 16 September 2010 02:41 UTC |
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Vaccuum Metallizing works rather well on most 3DP objects. You'll need to make it water tight and baby-butt smooth before the metalization, and flaw in the surface will be immediately visible.
There's a whole mess of companies out there that do it.
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| Re: Mirror coating ideas? [message #17957 is a reply to message #17821 ] Fri, 17 September 2010 12:59 UTC |
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Sorry for the different topic, but this reminds me that - when I was younger - I was wondering what would happen if you put two parabolic mirrors, of different sizes, one in front of the other with their respective focal points just at the same place.
Here I draw half of the two mirrors and a sunbeam.
The parallel sunbeams should all concentrate on this point without possibility to escape...
I was convinced that I could never try and I forgot the idea.
Now, what do you think? Is it feasible?
[Updated on: Fri, 17 September 2010 12:59 UTC]
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| Re: Mirror coating ideas? [message #17959 is a reply to message #17493 ] Fri, 17 September 2010 13:19 UTC |
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I've wanted to try a similar idea, A combination idea. If you've ever seen a crystal ball, they actually bend the light towards the center. Then I saw a video of this guy in Mexico or something that used empty soda bottles, and put water with a cap full of bleach to light his house. By having the bottles in his ceiling, collecting light and transmitting it below. So I bought a snowglobe, stole the globe, but have yet to fill it with bleach water to test if it will pull the light to the center and glow brightly.
The Mad Moder
michael@shapeways.com
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| Re: Mirror coating ideas? [message #18475 is a reply to message #17493 ] Tue, 28 September 2010 06:13 UTC |
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Reflective Mylar can be glued on, and it's cheap.
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| Re: Mirror coating ideas? [message #18587 is a reply to message #18475 ] Thu, 30 September 2010 16:34 UTC |
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Real mirrors work their magic because they have nearly flawless surfaces. Most surfaces created by current printing technologies can't come even close to the tolerances required to produce a true mirror surface. Because of the relatively low densities of most printing processes no amount of post finishing will produce an even edge to edge mirror finish. Selective laser sintering (SLS) might come close but the process is roughly 10x the cost for print services. Better to learn to grind your own mirrors, just like the old days.
-G
"Where the spirit does not work with the hand, there is no art."
Leonardo da Vinci
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| Re: Mirror coating ideas? [message #18588 is a reply to message #18587 ] Thu, 30 September 2010 17:46 UTC |
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| GlenG wrote on Thu, 30 September 2010 16:34 |
Real mirrors work their magic because they have nearly flawless surfaces. Most surfaces created by current printing technologies can't come even close to the tolerances required to produce a true mirror surface. Because of the relatively low densities of most printing processes no amount of post finishing will produce an even edge to edge mirror finish. Selective laser sintering (SLS) might come close but the process is roughly 10x the cost for print services. Better to learn to grind your own mirrors, just like the old days.
-G
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It doesn't need to be like 'the old days'... loads of ideas here & a satelite dish coated with reflective mylar works very well (good enough to melt aluminium with the right size dish)
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