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Old 02-02-2018, 12:24 PM
Kunama
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"Excalibur"

With "Guinevere" now under the care of OzEclipse and the Bino-TSA project nearing end, it is time once again to look forward to a Autumn/Winter project...

To that end I was fortunate to recently buy 'mch62's Dobsonian and although the scope was solidly built it was never going to fit into my chariot without some major design changes........

The new scope will feature:

Suchting Precision Optics 18" F3.54 Primary Mirror
Astrosystems 4.5" ma 1/10 secondary mirror (Focal Length 63.7" or 1618mm)
Starlight Instruments Feathertouch FTF2015BCR 2" focuser
Starlight Instruments SIPS Coma corrector
Astrosystems Heavy Duty Type III Spider
Astrosystems Secondary holder
Moonlite Truss Clamps
Custom 18pt mirror cell/tailgate
and aluminium structure for the mirror box and rocker box

Last edited by Kunama; 10-02-2018 at 10:18 AM.
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Old 02-02-2018, 12:37 PM
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Atmos (Colin)
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Old 02-02-2018, 12:53 PM
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Make it out of solid Jarrah this time, so that when you kick the bucket, we can present it to the National Museum of Australia. It'll look nice next to the Grubb refractor...
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Old 02-02-2018, 01:46 PM
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Make it out of honeycomb carbon fibre so that the entire structure weighs less than Lewis’ left foot.
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Old 02-02-2018, 02:01 PM
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This:
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Last edited by Kunama; 06-02-2018 at 06:44 AM.
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Old 02-02-2018, 02:42 PM
bratislav (Bratislav)
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If that is the case, one pic instead of 1000 words ...
(this is a 16" but principles would be the same).
You can't go any lower, lighter or stiffer.
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Old 02-02-2018, 02:49 PM
bratislav (Bratislav)
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Can't get any lighter at the top either.
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Old 02-02-2018, 02:55 PM
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pmrid (Peter)
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I seem to remember that Sir Lancelot did to Guinivere what Trump is doing to world peace. Any connection?
Peter
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  #9  
Old 02-02-2018, 02:58 PM
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Quote:
Originally Posted by bratislav View Post
If that is the case, one pic instead of 1000 words ...
(this is a 16" but principles would be the same).
You can't go any lower, lighter or stiffer.
Quote:
Originally Posted by bratislav View Post
Can't get any lighter at the top either.
Very Nice !!! Thanks Bratislav (sent you a PM)

Last edited by Kunama; 03-02-2018 at 01:26 PM.
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Old 02-02-2018, 03:55 PM
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Quote:
Originally Posted by Kunama View Post
"Alas, dear Lewis, there'll be no Jarrah for the weight of such fine timbers would be counter to the design parameters that one must work to......."

Ban of Benoic......
Meh, you'll only keep it a couple months before selling it anyway, so make it solid as hell. Plywood is cheap and nasty...

Or given your heritage, solid koivu.
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Old 02-02-2018, 03:56 PM
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Quote:
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Make it out of honeycomb carbon fibre so that the entire structure weighs less than Lewis’ left foot.
75kg? I think Matt can achieve that. Maybe even under the weight of my hallux.
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Old 02-02-2018, 03:59 PM
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Cool project, Matt!
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  #13  
Old 02-03-2018, 11:48 AM
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Thanks one and all and thanks especially to
Mark Suchting for lots of advice and suggestions,
Bratislav who sent me a comprehensive album of his scope components and
Tom Osypowski for making his designs available to me

After raiding the warehouse of Ullrich Aluminium, Hume, I got out my trusty Makita Slide Compound Saw and set about transforming long lengths of Aluminium into lots of short lengths:
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Last edited by Kunama; 05-03-2018 at 05:10 PM.
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  #14  
Old 02-03-2018, 02:49 PM
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Good luck with the project , I'm glad you bought it I was seriously looking at ways to hide it someplace until i cleared some space .
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Old 02-03-2018, 03:06 PM
croweater (Richard)
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Looking good Matt. Love this stuff Will be watching. Cheers Richard
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Old 02-03-2018, 03:36 PM
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Very impressive indeed. look forward to the finished project.

Leon
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  #17  
Old 02-03-2018, 04:59 PM
Kunama
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Quote:
Originally Posted by GrahamL View Post
Good luck with the project , I'm glad you bought it I was seriously looking at ways to hide it someplace until i cleared some space .
I was surprised (and glad) that you didn't go for this one Graham.

Quote:
Originally Posted by croweater View Post
Looking good Matt. Love this stuff Will be watching. Cheers Richard
Richard, this will be another 3 month project, Jennifer won't take too kindly to me working on it every day like the last scope !!!

Quote:
Originally Posted by leon View Post
Very impressive indeed. look forward to the finished project.
Leon
Thanks Leon, my target date for "First Light" is 26 June.... at a much later date will come an Equatorial Platform to replace the current ground board which was also saved from Mark's original build. I just have to learn how to build an Eq Platform.... I would love to buy one from Tom Osypowski but need to win Lotto first.
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  #18  
Old 19-03-2018, 08:23 AM
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Mirror box ready for welding:
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  #19  
Old 19-03-2018, 08:31 AM
Kunama
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The bits and pieces have now been cleaned, washed and readied for the build:
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  #20  
Old 21-03-2018, 11:36 AM
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OzEclipse (Joe Cali)
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Looking good Matt ...... although i wonder.....

in that last image of the mirror under ronchi test, it looks like it's figure is spherical not parabolic

Joe
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