Acrylic Forming Oven

I have read the post about an acrylic annealing oven, which raises a few questions about acrylic forming. I have done quite a bit of work
with un-formed acrylic sheets in making aquariums and have been successful. I would now like to branch off a bit and investigate formed acrylic as there are several parts that I have made out of flat acrylic in the past that I would have preferred to to use a curved sheet. I have seen the 'heating strips' that a DIY'er can use for straight bends, up to like 1/4" thick acylic. I would like to learn more about how an acrylic forming oven could be made and safely used in my basement so that I can attempt bending thicker sheets or make a gentile curve over the length of a sheet (to make a bowfront tank if anyone knows what that is).
I'm an electrical engineer, so I know I can do any wiring involved. I have an area where I can cut a vent to the outside, and probably have all of the tools to do the job, just don't know how to build one because I don't know how one works. Can someone shed some light on the subject? I'm looking at this from a DIY standpoint, not a production shop.
Also, what prompted the questions are a post I read about acrylic annealing. I have worked with aluminium in the past and know what annealing is in that case, but am not sure I understand it as it applies to acrylic. It appears that there is a certain amount of water that needs to be 'dryed' out of the acrylic? How does annealing fit in with forming?
Thank you for any advice you may provide.
Benj420
"I don't need to study English, I'm going to be an Enguneer" Posted at: http://www.groupsrv.com
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Plenty of stuff on the internet. Here's a first hit: http://www.designnews.com/article/CA85859.html If you do this at home, make sure you have good fume venting as this can be a problem since you have to heat the sheets to temperatures near decomposition point. Quite large shapes like spas are made by thermoforming acrylic sheet: http://www.bathworld.com / Frank
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