Making a Telescope Mirror Tool from Dental Stone Part One

This video shows how to make a tool used to fabricate precision optical surfaces from dental Stone

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25 Responses to “Making a Telescope Mirror Tool from Dental Stone Part One”

  1. I concur. They need to learn some respect. Francis is sharing his knowledge and experience in mirror making. Even though I’ve read some mirror making books and watched many videos, I’m always looking around for more good information.

    If you don’t have the patience to watch the first part of this video, then you most likely don’t have the patience required to make a high quality telescope mirror.

  2. Love the cat dude those guys are kids.

    Good Video man :-)

  3. just kill the cats. problem solved

  4. Lose the cat!

  5. Thank you for your constructive criticism. I am getting ready to make a new series of videos. I* will try to be more professional as time goes on.

    What telescope projects are you now engaged in?

    Best regards,

    Francis J. O’Reilly

  6. @Miquella16 That you. I have a number from New Mexico Tech in Socorro. A scientifically oriented young person from Santa Fe as yourself might want to consider that excellent school. Make sure that you do your homework in High School though. It’s alot more important than you might otherweise think.

    What type of telescope are you planning, as we discussed, I can guide you online from my home in NY.

    Francis J. O’Reilly
    foreilly@bestweb.net

  7. I may have liked this video a lot better if it had got to the point from the beginning instead of having to watch 4 1/2 min of nothing to see the final 4 mins. PS. I like cats to but I did not pic this vid for a cat show. Your vids would be a hell of a lot better when they get to the point. Almost everyone hates commercials in there shows and that’s why we get HBO.

  8. @azzy314159, Yikes! I thought it might be a pseudonym that Ben Stein was using on youtube, but Frank’s a lot younger etc, etc. I love the cats too.

  9. Francis OReilly on February 21st, 2013 at 1:42 pm

    I was on Mr. O’Reilly’s show once, in 2006. We were discussing immigration. It was fun.

  10. He is a million times better than Bill O’reilly

  11. I can see the cat is part of the ingredients for making the mirror!

  12. Francis OReilly on February 21st, 2013 at 3:36 pm

    How s your telescope project coming?

  13. Francis OReilly on February 21st, 2013 at 4:07 pm

    Thanks for your kind words.

  14. Nice cat, great vid :)

  15. Francis OReilly on February 21st, 2013 at 5:46 pm

    The surface is cur4ved

  16. Looked a bit more and I see that fine ground means that the curve for the mirror has been fine ground and that the tool you are making here is for the pitch lap used in the final polishing. I may have to email you with some questions on rough / fine grinding if that’s ok?

  17. Actually I do have a question:

    your glass blank, you say it’s been fine ground but has it been ground to a completely flat surface or a curved one?

  18. This is exactly the sort of video I’ve been looking for :) . Thanks very much.

    BTW your cat seems to be suffering badly from tearing. I suggest you triple buffer it and enable it’s V-Synch.

  19. Together with “Fortunado the contaminator” LOL!!!!!!

  20. Great video !

  21. :) hehe, ya. i`m “trying” it . But as i said, how would i go about using the “grinding technique” after i have spun it? In order to get the precise shape.

  22. Francis OReilly on February 21st, 2013 at 9:28 pm

    Please keep me posted on your progress.

    Best regards,

    Francis J. O’Reilly

  23. Francis OReilly on February 21st, 2013 at 9:40 pm

    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

  24. 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.

  25. 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.