I had to physically push down on the center of the plastic to get it stretched.
When the plastic cooled I removed the wooden frame and pulled it out. It looked great! Maybe not as convex as I needed, but definitely a good step towards my ultimate goal.
Next it was time to move up to full size 15" domes.
I cut a larger jig, sandwiched a new sheet of plastic and squeezed it into the oven.
Actually, I first tried a heat gun, but I couldn't heat the sheet fast enough to get it to soften up. The oven was the obvious next step.
I laid out a sheet of aluminum foil in case my plastic melted all over the place. I cranked up the oven to 550F and turned on the broiler (in this case an overhead electric heat coil).
Well, actually, nothing happened until I looked away for a moment. The plastic drooped down to the rack!
I threw open the door and pulled out my project. Bubbles!
Damn. I missed the "hot enough to be pliable, cool enough to not bubble" heating window. I was going to have to be more vigilant.
On the second attempt, I turned down the heat and stuck with the lower heating coil only, not broil.
I set the heat at 400F, kept the door cracked open and a close eye on it.
As soon as it started to droop, I yanked it out. I wanted a slightly more concave dome, so I gently pressed down with oven mitts. I know this sounds crazy, because I wanted a perfect smooth curve, but the hot plastic was elastic, bouncing back to smooth.
Cool and out of the jig, it looked awesome! A perfectly smooth bubble.
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Spinning Tornado Costume |
Scott's AT-ST Costume |
Balloon Hut |
Feather Pinwheel |
QR Code Costume |
Paparazzi Costume #2 |
Solid Ice Beer Caddy |
Greg's Whiplash Costume |
Lloyd Dobler Boombox Costume |
Best Costumes on the Internet |
The Money you Could be Saving with Geico Costume |
Urban Gardening |
Kindling - wooden Kindle |
Box of See's Candy Costume |
Dwight Shrute Bobblehead Costume |
The Light Sharpener - satellite dish solar cooker |
The American Idol Judges Halloween Costume |
Sudoku Costume |
The Infinite Candelabra |
Baby June, hospital childbirth |
Hero's Engine |
Devo Hats |
Dr. Octopus Costume |
Jenga Costume |
Banana Skin Coat |
California costume |
paper mache satan |
spring shoes |
metallic wings |
fire without matches |
paper mache hummingbird |
paparazzi costume |
matchstick cats |
fish costume |
ketchup packet bear |
Africa costume |
push to cross sign |
paper mache globe |
paper mache alien |
pet coffin |
paper mache Elvis
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October 16, 2009.