Step 7: Make the Supportive Eyepiece

Since the larger gear will be rotating, we need to keep it from hitting the skin on your nose or cheek, otherwise... rip! And you skin will tear.  

I found a piece of bicycle tubing that fit the edge of my aperture perfectly, so I decided to cut off a good 11/16".  You can round up or down, depending on the structure of your face.  Make it long enough so that the gear will fit comfortably.  

Note: Notice how the ID of the tube isn't small enough to overlap with those little circles on the aperture. This is CRITICAL!  Those circles are actually pegs that rotate in holes.  If you're going to super glue the tube to the aperture, you need to make sure that the super glue won't go into those holes!

Now, we're going to carve part of the tube out so that the tube isn't just jamming into your face.  I tried to trace out all of the parts of my face that were coming in contact with the tube while holding it up to my face.  Then, I'd go over to the belt sander and go at it until I thought I was done.  This was an iterative process, so I'd say just go for it.  If you mess up, you always have more tube!  The largest grind that I made was to accommodate my brow.

First thought when I saw these: HELLBOY 2!!! The undead ninja that winds himself up and turns to sand. I really want to make this now. That's awesome. Great job!
If I may, I am a fan of steampunk, and, even when not necesarily in steampunk character, per se, I usually wear a pie hat, (you know, popular in the1880's-1920's) and it has a lot of unused room at the front. Is there any particular reason you couldn't putthe controller chip in the hat?<br>
This is a great project, but with the lathe action in several places, probably beyond the scope of many of us. I, too, am eager to see the video!
I would also LOVE to see a Video of this in action...
Wow, I commend you on this awesome project. I'm wanting to start a similar external geared iris set of goggles. I'm actually considering a small 12v Servo from something like an RC plane with a simple switch. I would LOVE to have the photo sensor on it, but your level of knowledge in electronics is far beyond mind. My mind went blank and I started to drool as I was reading your programming of the step motor board. <br><br>Anyways, thanks a ton. This is a great project!
Awesome. Can't wait for the video. Thanks for sharing.
This guy looks like a Borg.
This is really great, can I make a suggestion? Why not use a pair of linear polarizing filters, where one is rotated against a fixed one? It'll be just as fast, but you won't have the field of view loss associated with closing an iris.
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Video? Where? I'd love to see this creation in action!
Superglue + cotton = fiyah! Never tried but looks cool on youtube. You'll take an eye out.<br><br>By the way, my bike was stolen after you guys showed up at the NYC Maker Faire. Silver colored Schwinn....wait...
This is very neat, you have my attention. I wish I could find some irises like the one you have there, I'll have to poke around the local camera shops a bit and hope I get lucky.
Outstanding.<br><br>Can't wait for the video - I hope you'll be in full steampunk'd grandeur ...

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