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My Other Telescope is an 8.4 Meter: Part II - Casting

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#1 Gork

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Posted 14 April 2019 - 12:49 PM

How do you create the world's largest monolithic optical mirror? As the saying goes, “One bite at a time.” It is a unique process in that it is entirely linear. No aspect of the process can be done in parallel since each step is entirely dependent upon the preceding step.

Click here to view the article
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#2 Patrik Iver

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Posted 14 April 2019 - 02:24 PM

Fascinating stuff - I'm looking forward to part III.



#3 RickV

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Posted 14 April 2019 - 02:37 PM

Exciting & interesting read - thanks Patrick!

 

Best,

Rick



#4 Jogo

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Posted 14 April 2019 - 10:52 PM

When we took the Mirror Lab tour this February, we learned so much--but your article is adding many interesting details to what we saw there.  Thanks so much...now eagerly awaiting Part III!



#5 aeajr

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Posted 14 April 2019 - 11:35 PM

Wow! I had no idea how large mirrors were cast.  That must cost a fortune. 



#6 Gork

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Posted 15 April 2019 - 01:42 AM

About $20 million per mirror.



#7 gustavo_sanchez

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Posted 15 April 2019 - 10:15 AM

Awesome, eager to read the rest.



#8 Gork

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Posted 15 April 2019 - 12:34 PM

Your website is awesome.  Now I think I know what I want to do with mine!  You have a great collection of telescopes for every purpose!

I'm not familiar with the iOptron mount, but I used the Atlas EQ-G for years and loved it.  I just got a Celestron CGX that is even better!  The alignment/calibration process and the polar alignment (even is you can't see Polaris) is super.  If you ever decide to change mounts I would recommend the CGX.  Thanks for your comment.  I am already working on the next article.  I had no idea that I would get the response I'm getting.

Clear Skies !

Pat 


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#9 chubster4

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Posted 15 April 2019 - 10:28 PM

Very interesting reading! That you 'lifted yourself up by your own bootstraps', and show how knowledge is no substitute for passion, is very inspiring and would resonate with many. Compile a little more background info and turn this into a book, please!!        



#10 Gork

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Posted 16 April 2019 - 09:55 AM

Thanks friend.  I appreciate your suggestion, but I don't think I have the patience to write a book.  But then, I don't have a lot of other things to do these days.  Who knows?

Pat



#11 jgardner

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Posted 16 April 2019 - 10:57 AM

$20 million?  It surprises me that there aren't a bunch of telescopes in the $50-million range (total) for those who could afford it.  Of course, I suffer from astronomy tunnel vision.  I know what I would do with 50 mil.  With a bil, pay off a region to lower light pollution to zero.  But that's moving off-topic.


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#12 Howard Lester

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Posted 16 April 2019 - 11:22 AM

Thanks friend.  I appreciate your suggestion, but I don't think I have the patience to write a book.  But then, I don't have a lot of other things to do these days.  Who knows?

Pat

Maybe you could find a "ghost writer."   ;-)  



#13 Gork

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Posted 17 April 2019 - 07:57 AM

That's an idea worth considering.



#14 Rich (RLTYS)

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Posted 18 April 2019 - 01:29 PM

An amazing article! bow.gif waytogo.gif



#15 chubster4

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Posted 18 April 2019 - 10:23 PM

The 'straight from the horses mouth', no-nonsense style of writing adds authenticity which makes the story more immediate and appealing. I'd worry a ghost writer might change the vibe. Could become part of the canon, like 'Starlight Nights'.  (No pressure, though... no pressure!)  smile.gif    



#16 chubster4

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Posted 18 April 2019 - 10:27 PM

Oh, and....    copyright



#17 EricGregory

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Posted 20 April 2019 - 06:21 PM

Great read.  Thanks for sharing!



#18 dUbeni

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Posted 23 April 2019 - 07:02 AM

Hi Patrick Stevenson, when you mention ton are you talking about metric ton or US short ton?

 

Thank you for another great article.

Bernardo



#19 Hawkdl2

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Posted 25 April 2019 - 02:17 PM

And if I ordered one today, how long would it take to get it?



#20 Gork

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Posted 27 April 2019 - 04:45 PM

Two years.



#21 wyzguy

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Posted 01 May 2019 - 10:53 AM

Great stuff Pat, keep it coming!  Appreciate you taking the time to write about a subject we love but never really knew what it took to produce on such a large scale!  At least I didn't.



#22 grzesznypl

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Posted 19 May 2019 - 01:33 PM

A very interesting read! good stuff!



#23 donel

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Posted 02 June 2019 - 12:40 PM

During my engineering career, I have worked in the glass and ceramic industry.I found the article fascinating. Having worked with tons of materials at a time I can appreciate the difficulties.


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