Sculptor, kinetic artist, and longtime MAKE pal Alan Rorie is back with this beautiful “pressure door” built for a Nautilus-themed art car commissioned from San Francisco art collective Five Ton Crane.

The door locks and unlocks via RFID, and the huge, four-foot diameter mechanical iris in its center is motorized:

The motorization of the large aperture was surprisingly easy. I used two small DC motors with spur gears and nice torque mounted on either side of the cam ring. I then welded chain around the cam ring turning it into a giant gear. It worked the first time I tried it. I controlled the two motors with an Arduino and a motor shield, two limit switches and a few lines of code. I then modified an old positioner and inserted a set of buttons, so that when you pull the handle of the positioner it trips the buttons and turns the motors.

Rorie, who is a specialist in iris apertures, also built four smaller irising windows for the car’s body.  There are many more beautiful pictures in Alan’s Flickr Set.   [Thanks, Alan!]

More:

• An iris by any other name?
• How-To: Paper Iris Glasses
• Handmade Irising Wristwatch Cover
• Free Irising Business Card Template
• Printable Iris-Lid Jewelry Box, With Video
• Brass amd Wood “Pressure Door” with Iris, Handwheel
• Motorized Iris Based on Chris Schaie’s Design
• Secret Knock-Detecting Workshop Door