DIY Curved Screen with structural extruded aluminum metal framing - Page 5 - AVS Forum | Home Theater Discussions And Reviews
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post #121 of 129 Old 01-04-2014, 08:57 AM - Thread Starter
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Quote:
Originally Posted by armstrr View Post

"If the horizontal distance from the centre of the chord is X, then the height of the curve from the chord at that point is:
h=sqrt(R^2 - X^2) - R + C
The sqrt part calculates the vertical height of the point on the arc from the centre of the circle, and then the -R+C adjusts so that the height is with respect to the chord instead."

i used the above and made a table in excel and checked it by graphing it and it looks good. thanks for your help! I'll start my own thread when i am further along
Great , it's been too long since a DIY curved screen build thread.
Share your excel table in your thread also.

Start it now, post your thoughts, plans, etc.

a) AT or solid screen?
b) If solid, will you apply specific paint mixture?
c) Size

btw, here in SE Michigan we may get slammed with 8-12" of snow in next 36 hours, and really cold temps....though you being in "Canuckland" I'm sure this is just another day for you wink.gif
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post #122 of 129 Old 01-04-2014, 09:00 AM
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Ok...will do. I live in a border city...so I'll be getting the same weather as 48060!
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post #123 of 129 Old 01-08-2014, 08:56 PM
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wish our temps would have been that mild... -20 below and wind chill to -45F:eek: we survived though


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post #124 of 129 Old 09-19-2014, 08:28 AM
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Came here via one of your posts in the Atmos threads, we were musing the next generation of AVR's...


Anyway, I haven't read this entire thread but from what I have it looks like a great screen!


I have a SMX AT screen, at the time Rueben was not making curved units, I bought mine material first with the intentions of making a frame then with other commitments decided to by one of his frames as well, it too is a 2.35:1 CIH unit with the same dimensions as yours.


I recall that you curve is 39.7 ft, IIRC Rueben made his about the same at 40 ft, is this how you decided the curve and what distance is the projector from the screen?


Sorry for all of the 'I's, but at one point I had considered seeing if I could bend the aluminium extrusion to the curve, I am pretty sure that is how he did them, just not sure who would have a roller system that could achieve this...


Cheers!


BTW, I too am waiting a bit for the Atmos AVR thing to settle out...

Al
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post #125 of 129 Old 12-03-2014, 10:05 AM - Thread Starter
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Quote:
Originally Posted by Al Sherwood View Post
Came here via one of your posts in the Atmos threads, we were musing the next generation of AVR's...


Anyway, I haven't read this entire thread but from what I have it looks like a great screen!


I have a SMX AT screen, at the time Rueben was not making curved units, I bought mine material first with the intentions of making a frame then with other commitments decided to by one of his frames as well, it too is a 2.35:1 CIH unit with the same dimensions as yours.


I recall that you curve is 39.7 ft, IIRC Rueben made his about the same at 40 ft, is this how you decided the curve and what distance is the projector from the screen?


Sorry for all of the 'I's, but at one point I had considered seeing if I could bend the aluminium extrusion to the curve, I am pretty sure that is how he did them, just not sure who would have a roller system that could achieve this...


Cheers!


BTW, I too am waiting a bit for the Atmos AVR thing to settle out...
I missed this post Al....busy with life
For the curvature amount I used the excel file from Aussie Bob, look here:
DIY Screen Curve Calculator (Aussie Bob)
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post #126 of 129 Old 12-03-2014, 10:15 AM
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Quote:
Originally Posted by mtbdudex View Post
I missed this post Al....busy with life
For the curvature amount I used the excel file from Aussie Bob, look here:
DIY Screen Curve Calculator (Aussie Bob)



No worries, and thanks for the link!

Al
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post #127 of 129 Old 01-25-2015, 07:00 PM - Thread Starter
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Seems I lost where this info was posted, so re-posting it here for keepsake.
This lens, UH380, has served me well over the years.


Here is a sheet to help you plan for your lens/PJ/Screen combo, pict shows the excel data, I've attached it so you can play with your situation
Attached Files
File Type: zip SonyVPL-VW60 LensAnalysis.xls 2.zip (11.6 KB, 10 views)
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post #128 of 129 Old 01-30-2015, 10:23 AM
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I too have the UH380, can't wait to get started on my re-do of the HT and get back to watching movies! It has been ripped apart for a few years to accommodate a kitchen reno...


I think I mentioned that I have a AT 2.40:1 screen and a BenQ W9000 PJ, soon there may the possibility of going to 4K as I see that there is an anticipation that 4K BD players may be out this fall!

Al
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post #129 of 129 Unread Today, 11:53 PM
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Forgive me if I have told this story before. Promise not to laugh. Let it be a warning to you.

I made a curved screen of carefully selected white "Laminex" or "Formica". I made a special order for a sheet 12foot X 6 foot. The dreaded and I got home late one night and it had been left rolled up (goodness knows how they rolled it up) in a cylinder roll 6ft high and about 2ft wide, bound with a couple of bits of plastic stuff. Quite heavy.
The dreaded went to bed. I dragged it into the HT room, which has no access from our house, but with a common double-brick wall, and decided to unroll it flat onto the floor to allow it to flatten.
When I cut the second binder the sheet unleashed itself SPROING with a tremendous release of stored energy. The edges are extremely sharp and I was lucky it did not cut my throat. In retrospect it was lucky the cook was not around too.

There I was alone, grappling with this great awkward somewhat floppy sheet which had cost heaps, and not wanting to let it kink and break. By stretching my foot as far as it would go I managed to drag a stepladder over to prop up a wobbly end.

For about half an hour I called out to my darling wife for help and finally she arrived and helped lower the sheet flat and unbroken to the floor.
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