Backyard Theater Forum

Backyard Theater discussions => Screen specific => Topic started by: binger on May 16, 2011, 01:18:14 pm



Title: New Screen Design - Will it work?
Post by: binger on May 16, 2011, 01:18:14 pm
I've been thinking about this build for over a year now and think I'm going to give it a shot but was hoping for some input before I start buying parts.

I plan on using BOC since it seems to hold up well based on other posts.  The screen frame will either be wood or EMT.  I want to put the screen between 2 - 4X4 fence posts that are 4 feet tall.  Here is where I either get crazy or smart (yet to be determined).  I want to put 5 foot threaded rod on the fence post with some L brackets.  Then I want to put 2 or 3 threaded knuckles on each side of the screen.  I think that I can then put a pulley on each threaded rod, and one in the middle of the fence section (at the bottom of all).  If I'm thinking correctly, I could then spin the center pulley with my cordless drill to raise and lower my screen.

I'm thinking the fence would protect the screen from wind and some of the weather.  I could build a litte roof over the screen to help deflect some of the rainwater.

I will try to post pictures of the fence, but it's nothing special, just a 4' tall dog eared fence.

Let me know your thoughts.


Title: Re: New Screen Design - Will it work?
Post by: binger on May 17, 2011, 12:06:20 pm
I realized after review the original post that the picture that I drew was really bad.  I'm an accountant not an artist, and it really showed.

Here is a better drawing of what 1 side of the screen would look like.  I may start building this weekend and will post a picture if I can get it done.


Title: Re: New Screen Design - Will it work?
Post by: cecilb on May 17, 2011, 12:15:03 pm
I'm neither an accountant, nor an artist. I can't figure out what you're doing. That said, I'm not real sharp on this stuff.


Title: Re: New Screen Design - Will it work?
Post by: binger on May 17, 2011, 12:22:57 pm
What I'm hoping it turns into is a screen that is attached to the threaded rod with couplers that will move up and down the rod when I turn the center pulley, in turn turning the threaded rod.  The threaded rod is going to be attached to the fence posts with angle bracket to give the couplers room to move up and down.

I guess it's kind of like the screw drive garage door openers, just turned to point to the sky. ;D


Title: Re: New Screen Design - Will it work?
Post by: bmac on May 17, 2011, 04:42:21 pm
On the surface, I think this is a very clever idea. 

How will you connect the threaded coupler to the screen material?  Will there be a problem turning the threaded rods when you have sufficient screen tension to provide a smooth, wrinkle-free surface?  Will a drill motor have enough HP to spin the threaded rods with tension on the screen?  Will the belts slip?  Would a bicycle chain / sprockets be better than belts & pulleys?

Looks like a lot of work to raise your screen 2'.


Title: Re: New Screen Design - Will it work?
Post by: binger on May 17, 2011, 05:06:47 pm
Those are some really good points.  I was thinking of a few of those, I was going to build a seperate frame that the screen would be mounted to and then, have plates on the side of the frame to weld or bolt the couplers to.  I think by doing it this way I'll keep the tension off the rod.

Doing more thinking, I think that I may go with 8' rod, so I can raise it completely above the fense.  That way I could also set up in the neighbors yard once in a while.  This does seem like a lot of work for moving the screen 2 - 4 feet, but I want it mounted semi permenant, but can't have it showing above the fense all the time.  I like the bike chain and sprocket idea, I have a friend that owns a bike shop and maybe able to pick up scrap parts.

I was thinking this was a good way to keep it hidden when not in use.


Title: Re: New Screen Design - Will it work?
Post by: Sparge on May 17, 2011, 07:53:27 pm
On the surface, I think this is a very clever idea. 

Looks like a lot of work to raise your screen 2'.

Agreed.


This does seem like a lot of work for moving the screen 2 - 4 feet, but I want it mounted semi permenant, but can't have it showing above the fense all the time.

Why so elaborate with pulleys and threaded rods?  I think you're over-engineering this.  Why not just attach rails on the fence posts to raise and lower the screen frame by hand?  Think storm window.  If you're not raising the bottom of the screen above your head then sliding it up and down by hand is very do-able with perhaps a pin/lock system on the rails to hold it up.

-Sparge-


Title: Re: New Screen Design - Will it work?
Post by: binger on May 17, 2011, 09:00:13 pm
Thanks Sparge,

That does sound a lot easier to build.  Maybe just some aluminum channel to slide the screen up and down in.

I think maybe I was just trying to hard to make it impressive.

Thanks for all the input.  I'm going to try to build it in the next week or two if the weather stays nice.


Title: Re: New Screen Design - Will it work?
Post by: bmac on May 18, 2011, 12:18:43 pm
Maybe just some aluminum channel to slide the screen up and down in.


Remember that when the screen goes up, you have effectively raised a large sail.  Whatever you use for your rail system probably needs to be rather robust, particularly if you are going to raise the screen completely above the top of the fence. 


Title: Re: New Screen Design - Will it work?
Post by: binger on May 18, 2011, 12:37:00 pm
The fence posts are cemented in the ground, and I still plan on running guy wires from the top corner.  The more I think about it, I may go with Steel channel just because it's a little more sturdy.  I think it may only be raised all the way above the fence is I project in the neighbors yard.  That only usually happens when it's one of his kids B-days.  Otherwise, from my side, it may only be raised 2' or 3'.

Thanks again everyone for the help.  It's great to have all of you to bounce idea's off of.  If the weather is dry, I plan to start on it and will post pictures when I'm done.



Title: Re: New Screen Design - Will it work?
Post by: Neuner on May 20, 2011, 08:06:16 am
bmac is right.  I understand your concept but the first thing that came to my mind was a flimsy support for your screen.  When these screens are up and a even a gentle breeze comes along, you won't believe the moment and tension on the frame and supports.  The fences have concrete bases but they are typically not very deep.  Enough for a 4-foot fence but not a sail.

Whenever we get settled from our move I plan on looking at putting sleeves near our fence that I can drop two 4x4, 16-foot high posts in.  I will brace between the two with a quick snap 2x4 and then hang the screen sort of like a picture frame.


Title: Re: New Screen Design - Will it work?
Post by: Tazman101 on May 28, 2011, 01:02:58 pm
After reading through the thread, just a couple things spring to mind.

1) In a semi-perminant setup, if you are using a metal frame would you run the risk of rust stains on the screen?

2) Also remember moving parts require some sort of lubricant to keep them functioning properly ( grease etc ).  Be careful to not mark up the screen.

3) If I'm reading correctly, you are going to have a 'roof' built over the top of the frame.  My thought is to hide the screen in this roof, and pull the screen DOWN for viewing, and UP for storage into the roof.  Similar to the old projector screens we used in school. This may have already been part of the design, i could have just not understood it. 

just my 2 cents, can't wait to see the final design.   8)


Title: Re: New Screen Design - Will it work?
Post by: phrend on June 17, 2011, 05:09:28 am
I agree that the threaded rod is clever, but I think it's gonna be a pain to get it working in the real world... for example, you'd have to raise/lower both ends at the same time - so, two drills, and two people would be required... or, you could raise one side 1', then run over to the other side and raise it 1' - repeat till it's up... doesn't seem to really make life easier?

Steel channel/Strut Channel is an idea that I've thought about quite a bit, but the little trolleys (http://www.mcmaster.com/#catalog/117/1524/=cs90l5 (http://www.mcmaster.com/#catalog/117/1524/=cs90l5)) for strut channel are pretty darn expensive!  You might be able to hack your own together from skate bearings, but I haven't tried yet.

Your design didn't seem to have a horizontal bar at the top or bottom either - am I reading your plans wrong?  Without horizontal bars at the top and bottom to support/stretch your screen, it is going to sag - the wider the screen, the more it'll sag.

I look forward to seeing what you come up with - I love all the different DIY ideas people share!


Title: Re: New Screen Design - Will it work?
Post by: binger on June 17, 2011, 01:08:13 pm
Still haven't had time on a dry day to start the build.  I have given up on the threaded rod, eventhough I had a sample built (only 1' tall to test my idea).  The cost was going to be much higher than I was expecting.  I've changed material and the method of raising the screen, but it's still going to be attached to the fence.

I'm hoping the weather forecast is wrong and I'll get a dry day this weekend to start assembling.  Here's hoping for some sun!


Title: Re: New Screen Design - Will it work?
Post by: binger on June 28, 2011, 12:55:46 pm
Well, my wife and I start our "vacation" on Friday.  This is going to be the first time in over 3 years that we are actually taking a whole week off.  I plan on actually getting this screen built one day during this week.  I found a material that I plan on trying (can alway resort back to BOC if it doesn't work).  ;D  It's a 4x8 sheet of a plastic type material with a very flat finish.  I think it may be wall material for industrial bathrooms.  I'm going to start with this material (it's only $25) and see how it works.  I will use BOC if it doesn't work out.  Cross your fingers that I can get this done so I can show some pictures finally.