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RE: Kiln Forming Lenses
Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response To Posted by Robert May on May 29, 2000 21:16:06 UTC |
Using a kiln to do slumping is a nice thing as it can "save" the cost of grinding glass off of a blank. The thing that you run into is that most amateur glass for mirrors really doesn`t need to be thick enough to require the weight savings that you can get by using a kiln. Once you get over about 25" or so, making up a front and rear plates with spacer walls in between will start to help and by the time you get to the 35" size, that sort of technology starts becoming quite usable. What you need to do is figure out how to fuse pyrex in the kiln without it fully slumping into a mess. Others have tried it with plate glass but that needs a lot of good annealing and then a sudden thermal shock will still destroy the mirror real fast. Sit down and figure the stresses in a hollow block of glass with rods from each corner to the center and you will see what I mean.
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