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Home > Classifieds > Astromart Classifieds > Telescope Making > Classified #120670

For Sale: 18" pyrex mirror blank*price reduced*

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18 " x 2" pyrex blank waterjet cut from rolled stock the back is blanchard ground flat to 320 grit the front has a 100" curve ground in it no room to finnish the job was asking $700 now $600 ive had some emails about the price its high due to the work in the glass so far the blank was broke out of a rolled anneled pyrex sheet we then put it in an oven brought it up to fuseing temp (1800 deg) then cooled down 50 deg per hour to make it fine anneled the radius was then cut out with a waterjet edges beveled both sides were then blanchared ground flat then it was back in the oven to anneling temp (1500 deg) and cooled for 50 deg per hour that makes it extra fine anneled the back was kissed off with a blanchard grinder and then the curve generated this is how you get a 30th wave mirror fine anneled pyrex will never be that good thanks for looking
 

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