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16" Zambuto Build

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#51 ad701xx

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Posted 16 September 2018 - 10:43 AM

Installed fuse block, terminal board and started wiring.

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#52 ad701xx

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Posted 19 October 2018 - 05:21 PM

Carl sent me this today...my mirror getting coated.

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#53 ad701xx

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Posted 19 October 2018 - 05:22 PM

A thing of beauty!

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#54 ad701xx

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Posted 21 October 2018 - 06:16 PM

Painted and stained.

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#55 ad701xx

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Posted 21 October 2018 - 06:17 PM

Another shot.

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#56 Garyth64

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Posted 21 October 2018 - 08:01 PM

I think I've said it before, but I really like that design.



#57 ad701xx

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Posted 22 October 2018 - 01:42 PM

Thanks Gary, I appreciate it.



#58 John Miele

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Posted 23 October 2018 - 02:42 PM

Hi Dave,

 

I love every part of this design but I'm not sure about how you want to use your fans. I may be all wrong and if you have data otherwise, please ignore me, but it seems if each fan is blowing at the mirror from a corner, you will get a lot of turbulent mixed up air right in the center. Wouldn't that wreak havoc with the boundary layer? Or are your fans only for cooling the mirror and you plan to switch them off while viewing? ...John



#59 stargazer193857

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Posted 23 October 2018 - 03:14 PM

Thanks Gary. I wish I could take credit for it but I can't. I've seen a few ATMs that have done it but I agree with you, it's genius.

I'll copy it if it does not raise the mirror much higher and require counterweight.

I approve of the scope size. As much aperture as you can stand next to and transport in a smaller car and not need ramps, and a focal ratio that is not too expensive.

Edited by stargazer193857, 23 October 2018 - 03:16 PM.


#60 Kunama

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Posted 23 October 2018 - 03:16 PM

Excellent work Dave, such a nice design for the mirror box/alt bearings.  Beautiful grain on the side.

Nice to see such attention to detail  waytogo.gif waytogo.gif



#61 stargazer193857

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Posted 23 October 2018 - 03:18 PM

I thought I was done for the night but the mirror box was just sitting there mocking me so I did some drilling and installed the topside collimation knobs.


How much better is 18 points vs 6? Enough to be the limiting factor with Zambuto optics?

#62 ad701xx

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Posted 23 October 2018 - 07:39 PM

Hi Dave,

 

I love every part of this design but I'm not sure about how you want to use your fans. I may be all wrong and if you have data otherwise, please ignore me, but it seems if each fan is blowing at the mirror from a corner, you will get a lot of turbulent mixed up air right in the center. Wouldn't that wreak havoc with the boundary layer? Or are your fans only for cooling the mirror and you plan to switch them off while viewing? ...John

Thanks John.

 

About the fans...I built my last Dob with 3 fans blowing across the mirror face which was all the rage in 2006 when I built it but I didn't find them that effective for the boundary layer and I believe they promoted uneven cooling on the 17.5", 2" thick mirror.

 

Some post by Oberon and I believe Mike Lockwood (I wish I would have bookmarked them) leads me to believe turbulence isn't such a bad thing so I am giving these a go for both cooling and boundary layer scrubbing. They are easily re position-able so I can do some experimentation if they don't work out.



#63 ad701xx

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Posted 23 October 2018 - 07:42 PM

Excellent work Dave, such a nice design for the mirror box/alt bearings.  Beautiful grain on the side.

Nice to see such attention to detail  waytogo.gif waytogo.gif

Thanks Matt. That's a great compliment coming from you. I'm a big fan of your work.

 

The grain on one side really popped and has some interesting figure. The other side looks rather plain in comparison.



#64 ad701xx

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Posted 23 October 2018 - 07:51 PM

How much better is 18 points vs 6? Enough to be the limiting factor with Zambuto optics?

A 6 point according to PLOP would probably be adequate at a surface RMS of 4.4222 -06 mm but since this mirror is only 29mm thick I decided to go for the 18 point which is 8.55105 -07 mm. 



#65 hakann

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Posted 24 October 2018 - 08:43 PM

Nice scope and optics.
I went up to Carl before OSP to look at my Quartz 18” f/4 mirror. I felt I was in good hands.

Keep posted on performance.

#66 ad701xx

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Posted 26 October 2018 - 05:17 PM

Nice scope and optics.
I went up to Carl before OSP to look at my Quartz 18” f/4 mirror. I felt I was in good hands.

Keep posted on performance.

Thanks. My experience with Carl has been first rate. In fact, he just emailed me to tell me my mirror has shipped today.


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#67 ad701xx

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Posted 27 October 2018 - 03:13 PM

One day later and my mirror arrived.

 

The polish on the back looks better than the front surface of many mirrors I have seen and owned. It is a beautiful piece of quartz. I didn't take many pictures because I intend to keep the protection securely taped on until I am ready to put it in the mirror box for the first time. 

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#68 ad701xx

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Posted 27 October 2018 - 03:19 PM

Here is an interesting shot using a flash. You can see the shadow of the engraving on the side of mirror in addition to the reflection on the front surface coating.

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#69 ad701xx

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Posted 11 November 2018 - 05:55 PM

It took a while but the mirror box wiring is complete.

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#70 ad701xx

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Posted 11 November 2018 - 05:56 PM

Another shot.

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#71 ad701xx

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Posted 11 November 2018 - 06:01 PM

Top side shot.

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#72 ad701xx

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Posted 08 September 2019 - 07:49 PM

Life kind of got in the way of my build but I was able to do some meaningful work on my scope this weekend.

 

I made a rear light shield/fan mount/ counterweight mount. 

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#73 ad701xx

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Posted 08 September 2019 - 07:55 PM

I made some 1" Delrin studs to mount 1" bore weight plates to the board. I put a series of them in a radial pattern so I could optimize their placement.

 

I inlaid some 1/2" rare earth magnets to hold and store some tools. Might as well use their weight as counterweight.

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Edited by ad701xx, 08 September 2019 - 08:00 PM.

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#74 ad701xx

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Posted 08 September 2019 - 07:58 PM

All painted and a 120mm fan mounted.

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#75 ad701xx

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Posted 08 September 2019 - 08:11 PM

A view from top.

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