Making A Telescope Mirror Tool From Dental Stone Part One
Wednesday, November 25th, 2009 at
8:55 am
This video shows how to make a tool used to fabricate precision optical surfaces from dental Stone
US $29.95
Together with “Fortunado the contaminator” LOL!!!!!!
Great video !
Please keep me posted on your progress.Best regards,Francis J. O’Reilly
You seem to know your stuff. You mind answering a few questions?1)How come when they make those large mirrors, shaped by centrifugal force, they still have to machine it down? wouldnt the centrifugal force create a perfect porabla?2)If i were to get a piece of glass, and form it using centrifugal force. Could i use this method (grinding by hand) to further refine it? if so what steps could i skip? just go straight to the finest sand?Thanks, I need someone to talk to about this stuff.
Thank you for your comments. Dr. Angel at the University of Arizona in Tucson pioneered mirror making using rotating molds in his lab underneath the football stadium at the University. The shape will be pretty good, but not perfect, I believe the reason is twofold, at least. Partially due to friction of the molten glass and it’s interaction with the mold as well as with itself. The other reason I believe is the lack of complete homogeniety of the glass. If you try it yourself, you are brave.
hi!!I really liked this video!It’s got me even more excited to make a telescope on my own!!But can you tell me about the different qualities of the primary mirror ’cause I only know the Pirex!!However I live in tunisia and there are no Pirex here!!So please help me about other types and tell me approximately the price!!I’m looking forward to your answer!! Thanks.
Tunisia has a coast as I recall. Perhaps you could salvage a porthole or two from a derelect ship? That was how the early amateur astronomers made their mirrors, including Henry Draper, as far as I can tell from 1862!Best regards,Francis J. O’Reilly
A cat in a telescope workshop? A cat, carrying in dust and dirt? One scratchy, pitted mirror coming up? I hope not… Seems you agree… Fortunato the Contaminator’ is at work! But would a cat really eat something inedible? I am sure she would sniff at it first! But the Dental Stone is a good idea. Thanks for letting on.B
Actually, the mirror came out about as close to perfect as could be imagined. No scratches, great figure, and most importantly, the views are spectacular. Jupiter is incredible. I’ve seen four Saturnian moons. I can see incredible detail in Clavius on the moon, a standard for testing optics.Best regards,Francis J. O’Reilly
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Me neither Steve, next time I stand next to that weir I’ll think about Feynman standing right at that very spot 30 odd years ago. He was some geezer allright!
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RT In 1990, Tinkertoys were used to build a partial model of the Hubble Telescope to help engineers fix an antenna problem.
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^^^ …и монетизация тривиальна: печатать рекламу, как в обычных бумажных изданиях
♪Stone Free – Jimi Hendrix
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زیقی ینی چی ؟