DIY Curved Screen with structural extruded aluminum metal framing - Page 5 - AVS | Home Theater Discussions And Reviews
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Old 01-04-2014, 09:57 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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Old 01-04-2014, 10:00 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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Old 01-08-2014, 09:56 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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Old 09-19-2014, 09:28 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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Old 12-03-2014, 11:05 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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Old 12-03-2014, 11:15 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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Old Today, 08:00 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, 0 views)
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