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Old 10th April 2005, 07:48 PM   #21
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Here is a top view of it, you can really see that it isn't polished at all but that is all about to change!
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Old 10th April 2005, 07:51 PM   #22
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I started wet grinding it with 400 size but after a while did I realize that this would take too many hours and I were under time stress. I did this in my fathers thin metal workshop and I can tell you that I had to explain the principles of an ellipsoidial reflector at least 10 times! thereby the nice scetches on the paper
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Old 10th April 2005, 07:53 PM   #23
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I didn't have access to an lathe so i used a pillar drill instead. I grinded it up to 2000 in size and then started the polishing process
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Old 10th April 2005, 07:55 PM   #24
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Here are the compounds I used to polish it to mirror shine
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Old 10th April 2005, 08:00 PM   #25
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I then built myself a lamp holder which positioned the lamp arc approximatly near the focus of the ellipsoidial. I made it easy to change the lamp and I also made it so i can adjust the lamp position inside the reflector.
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Old 10th April 2005, 08:02 PM   #26
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It was a shame that I did not have time to test the projector out when I was at home with the parents...and now am I stuck at the uni for another 2 months so I can't really build much until summer, but then fortunantly it will be ready! Here is another view of the reflector, if it works well is the next step to chrome the aluminium so it won't oxidize which it will do right now
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Old 13th April 2005, 05:22 AM   #27
Me2! is offline Me2!  Canada
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R U using a double ended with that? Seems a shame to have the wire in front of the projected light.

Ever check out the G12 bulbs?
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Old 13th April 2005, 10:57 AM   #28
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It's true that there is an wire, but because the light diverges to a focus doesn't it really matter that much. At least I think so. It's just a shame that I wasn't able to complete the projector in time...
I'll look into the G12 bulbs I think it'll be fairly easy to convert the lamp holders if i was interested in that!
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Old 28th August 2008, 09:50 PM   #29
XIGATON is offline XIGATON  Argentina
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Default build a ellipsoidal projector using a printer !!

i thing that is possible do a correct geometry for a ellipsoidal from a cad soft .
next you create the geometry . print it and past over a plate. netx cut over the line .
this plate has de path correct.!!
next put to turn arroung a axis .
i have a not bad idea about how do it !
my apology for my horrible inglish.
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Old 28th August 2008, 10:31 PM   #30
XIGATON is offline XIGATON  Argentina
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Default more pictures

if we make a big ellipsoidal reflector .
is possible do a projector fresnel less. beause the ray go direct to the triplet.
like show a simulation in the follow pictures.
if the idea are for you interesting .then show you my advances.
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