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Torus for blend setup
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Spanky Ham




Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central


PostLink    Posted: Tue Dec 23, 2014 3:28 pm    Post subject: Reply with quote


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Do you have a link?

I was thinking about this last night as the High Power isn't available. I might grab a sample of some Sintra and see if it can be shaped into a Torus. I can't remember if I had a Gatorboard or Sintra, but a lot of light passed right through it. I will see if putting a mirror behind it increases the gain.
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ecrabb
Forum Moderator



Joined: 13 Mar 2006
Posts: 15909
Location: Utah

TV/Projector: JVC RS40, Epson 5010


PostLink    Posted: Tue Dec 23, 2014 4:16 pm    Post subject: Reply with quote

Spanky Ham wrote:
Do you have a link?

I was thinking about this last night as the High Power isn't available. I might grab a sample of some Sintra and see if it can be shaped into a Torus. I can't remember if I had a Gatorboard or Sintra, but a lot of light passed right through it. I will see if putting a mirror behind it increases the gain.


I've used both materials extensively over the years - not for projection, but for their intended purposes, i.e. photo and display mounting. I can't see how much light would pass through either material. Gatorboard is a paper-foam-paper sandwich, so should be quite opaque, but I could imagine it passing some light in thinner weights like .25-inch. Sintra is just closed-cell pvc, so if it passed some light, I'm guessing it was pretty thin, like 3mm. Even then, I can't see it passing much light unless the light was extremely bright.

SC
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Spanky Ham




Joined: 22 Mar 2006
Posts: 5643
Location: Comedy Central


PostLink    Posted: Wed Dec 24, 2014 2:39 am    Post subject: Reply with quote

Whatever I had, I used with my Marantz pj. It lit up the back so much, I thought it could be used for rear projection and I am not trying to be funny. The picture was very clear on the backside of the board. My guess is it was 1/2" or less.

Whichever one that could be used, it would be best to go as thin as possible to make sure there is no refraction errors. A 3/16" Gator or 2mm Sintra might work.
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tschaeikaei




Joined: 08 Apr 2013
Posts: 489
Location: Germany/Saarland


PostLink    Posted: Wed Dec 24, 2014 11:38 am    Post subject: Reply with quote

Finally, i did paint it. No more trying of different materials, just silver paint.
It's a ceap and easy type of paint. Much aluminum in it, not that heavy smell and fast drying.
A bit brighter than the 2,4 gain sample "Medio"
I have here. Good polarisation, no visible (i cannot measure it right now) color changing against white or the silver sample.
Viewing angle depends on how you work with it. I did roll it, the angle was ok.
After spraying with a HVLP gun, the surface is a bit rough (like i wanted it), even bigger viewing angle.

Paining cabin in my living room and finished screen. No smell at all in the room while the fan is running (40W, much much volume and loud, blowing the air outside the window.)



Regards, Julian
...and have a good christmas time.

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Marquee 9500U edgeblend P43 | NEC 9PG
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gjaky




Joined: 05 Jun 2010
Posts: 2789
Location: Budapest, Hungary


PostLink    Posted: Fri Jan 02, 2015 8:00 pm    Post subject: Reply with quote

So how is this screen looking in action?
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projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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