Various part from/for an 18" CPT - disposing of.

[Mark]

I'm clearing out old telescope parts and came across some inventory from the telescope in this photo.  I will either give them away, donate them if wanted to a Maker Space, or possibly recycle at a metal supply biz.  Mentioning it here first.  Not sure if I have a complete set (but I could inventory it if someone is interested):

Ray Gralak and an 18" CPT f/4.5.  Airline grade 6061 T(6?) aluminum.

[KG]

Looks like a work of art! Worthy of Burning man exhibit 😍

GK

Sent from my iPhone 

On Jul 28, 2026, at 11:52 AM, Mark <itsmar...@gmail.com> wrote:



I'm clearing out old telescope parts and came across some inventory from the telescope in this photo.  I will either give them away, donate them if wanted to a Maker Space, or possibly recycle at a metal supply biz.  Mentioning it here first.  Not sure if I have a complete set (but I could inventory it if someone is interested):

Ray Gralak and an 18" CPT f/4.5.  Airline grade 6061 T(6?) aluminum.

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<18CPT-FP-04.jpg>

[Mark]

Thanks Gopal.  It was a very exciting experience seeing the big industrial CNC mills routing the parts. And getting to a final product.  Jim Everitt, local astronomer and machinist was integral in the process.  Our daughters were great friends.

[Raymond Wong]

Mark:  If you get no takers, let me know - I and/or the Telescope Makers Workshop might be interested. 

I have a 14”-er I need to finish polishing out… The port hole glass came from John Dobson.    

Cheers, 73s, Clear Skies and Clear Blocks,

Ray

[Dave Bullock]

I’m interested in the optics but would probably build the rest with truss/wire so it’s portable. 

On Jul 31, 2026, at 1:21 PM, Raymond Wong <wandering...@gmail.com> wrote:



Mark:  If you get no takers, let me know - I and/or the Telescope Makers Workshop might be interested. 

I have a 14”-er I need to finish polishing out… The port hole glass came from John Dobson.    

Cheers, 73s, Clear Skies and Clear Blocks,

Ray

On Tue, Jul 28, 2026 at 11:52 Mark <itsmar...@gmail.com> wrote:

I'm clearing out old telescope parts and came across some inventory from the telescope in this photo.  I will either give them away, donate them if wanted to a Maker Space, or possibly recycle at a metal supply biz.  Mentioning it here first.  Not sure if I have a complete set (but I could inventory it if someone is interested):

Ray Gralak and an 18" CPT f/4.5.  Airline grade 6061 T(6?) aluminum.

<18CPT-FP-04.jpg>

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[Mark]

Parts are spoken for.  If it doesn't work out I'll repost.

[Raymond Wong]

Mark:  Actually, a member of the Telescope Makers Workshop (TMW) is working on a 16” mirror, f/4.6 - his a closer fit than mine, so if it ends up with my taking it, I will pass it off to him, if that is alright with you.  

Cheers, 73s, Clear Skies and Clear Blocks,

Ray

[Chris In Felton]

Hi Ray.

Can you please steer me in the direction of this TMW? At some point I plan to become an active ATM again. Thanks!

Clears



https://groups.google.com/g/sf-bay-tac/c/oTv-aE4Wn5A/m/JiH3lcqQBAAJ

Chris in Felton

[Raymond Wong]

Chris:  The Telescope Makers Workshop is (almost) every Friday evenings, from 7:00 - 10:00 PM P, up at the Chabot Space and Science Center (CSSC) in Oakland, CA.  Occasionally, CSSC rents out the lab the workshop is held in.  

Chabot Space and Science Center 

10000 Skyline Blvd

Oakland, CA

For more information, contact Richard Ozer at:

t...@eastbayastro.org

Cheers, 73s, Clear Skies and Clear Blocks,

Ray

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[Aris Pope]

Speaking of truss/wire tube. Here's a sweet one I saw at OPS. I believe it's 16-20" and somewhere around f/3. Maybe Muriel or Akarsh would know better. It surprised me how sturdy it was. 

To view this discussion visit https://groups.google.com/d/msgid/sf-bay-tac/753B785D-DE86-451C-8EB9-9C378FFC4FAB%40eecue.com.

Aris