Instructables

Want to make an Iris Diaphram

HI all. Very new to this forum so apologies up front if this this the wrong etiqute for posting. I would very much like to make a a large scale (1m or larger) Iris Diaphram. AKA the Iris on Stargate. Would like to make it big enough to make into wall are to hide a clock or even a plasma screen Tv. I know (sort of) how the mechanisn works but can't seem to find an instructions on how to build this out of thin ply wood or plastic, foam board etc. Was hoping someone here with MUCH more mechanical skill than I might be able to take up the challenge. I've added soem pics I found around the web incase that might help

antienoob4 years ago
i have seen something like what you are trying to do on youtube. using some type of special lego and it was about a foot in diamiter, it looked grait but also very complicated because it was remote controled.
Edgar7 years ago
This freely downloadable Ebook I found has a lot of Photo projects, give it a try:

The Boy Mechanic
trebuchet037 years ago
That sounds like a really cool effect for a TV -- especially if you can have it remote activated :P

If I were to do this - I'd find an old camera lens with an adjustable aperture. Then slowly, carefully and methodically take it apart to see how it works. Lay out all the parts in order of disassembly and see what makes the mechanism work ;)

From the looks of it - each "blade" will require two pivot points and a carrier ring. It will probably be more clear if/when you take it apart :P
rmey (author)  trebuchet037 years ago
Appreciate the feedback.. Having trouble finding an old camera to sacrifice
Here's the basics on how the iris works. As trebuchet said, there are two pivot points for each blade. One into the base plate while the other one goes into the blade actuating ring. The base plate stays stationary while you turn the ring which closes the blades using angled tracks. Hope that helps...
Camera Iris.jpg
rmey (author)  FrenchCrawler7 years ago
Thanks for the feedback.... When and if I get this put together I'll be sure to post a step by step and some pics
I'd also like to add on as to how I view the 3rd picture you provided:
2 = Base plate, 3 = Actuating Ring, 4 = Blades closed, 5 = Blades open, 6 = (your guess is as good as mine :P I'd say it'd be motor in open position), 7 = actuating ring lever, 8 = offset lever (kind of like a cam)?, 9 = motor.

As you can see the actuating ring lever (7) has two pivot points. One point attached to the actuating ring (3) and the other attached in the center of the offset lever (8) and the upside down double V's (I don't know, but I figure it blocks out the rest of the light that may leak through). The upside down double V's and offset lever (8) seem to be one piece and is fixed to the motor.

So when the motor turns toward the aperture, the ring lever (7) turns the ring (3) while the upside down double V's lever covers up the rest of the hole. Hope that isn't too confusing :P
I also could be wrong on some of those numbers cause I'm just doing an "educational guess" ;)