In this Instructable I will describe the process of building a mechanical iris diaphragm window with a porthole into an existing wall opening. I've always appreciated old fashioned ingenuity where the mechanics were as much art as function and a mechanical iris is a great example of this. Irises have a unique balance and symmetry and the steampunk world has taken the device to a new level of appreciation.
Several months back began creating a studio in the attic above my garage. Little by little I've been filling the space with tools, decor and computer equipment. The room had one small window on the one framed in wall. This wall is something of a focal point in the room and I've been want to do something creative with the window and a big round iris seemed perfect.
The space originally was completely unfinished with open rafters, roof and wall framing with a simple screened window built into the framing. On the exterior of the house this window is covered with louvers so even with the lights on at night it doesn't draw much attention. I began insulating and laying the sub-flooring and covering the walls and ceiling with OSB sheeting. The window was only finished on the outside so I covered the void with OSB and marked the opening. I found some inexpensive laminate flooring and used it on the floor and for a different look I covered the windowed wall with it as well.
Thanks everyone for taking a look see - please vote for me in the Full Spectrum Laser Contest!https://www.instructables.com/contest/fullspectrum2014/