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Zane and Logan's 10 inch F/3 project

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#201 brave_ulysses

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Posted 06 October 2019 - 09:21 AM

thought i had wandered into the wrong forum...

 

what is a good target temp and how much variation is allowable?

 

thanks!

 

The acid is not needed, we stopped using it back in the 70's. Powder chalk and distilled water is key. You must clean the edges and bevel first, then rinse, then chalk the mirror. I have silvered hundreds of optics, from 4 inch to 36 inch for precision optical testing while at Tinsley. The mix must be fresh, temp control and very clean area and optics. The Oregon group have addressed these issues with data and great results. The AG chemicals work great, they are very happy with the results.

 

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#202 tommm

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Posted 06 October 2019 - 01:11 PM

 The Oregon group have addressed these issues with data and great results. The AG chemicals work great, they are very happy with the results.

 

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Where does one access this data?



#203 Oregon-raybender

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Posted 06 October 2019 - 01:58 PM

Sorry, old guy brain,gramps.gif  reference to nitric acid, I do get it, lol.gif  It was in Berkeley, so, no  fingertap.gif

 

The Oregon group should be releasing the data shortly. They are in the process of writing an article for S&T I believe. They do cover the process in detail. Don't when the release day will be.

 

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#204 Bob4BVM

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Posted 06 October 2019 - 03:04 PM

Sorry, old guy brain,gramps.gif  reference to nitric acid, I do get it, lol.gif  It was in Berkeley, so, no  fingertap.gif

 

The Oregon group should be releasing the data shortly. They are in the process of writing an article for S&T I believe. They do cover the process in detail. Don't when the release day will be.

 

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Can't wait to see the info. Pls keep us posted, may be worth starting a new thread to discuss their findings.

 

One of these days I need to get my butt up to Ptld for one of your meetings. Are they monthly ?

 

Thx

Bob



#205 Oregon-raybender

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Posted 07 October 2019 - 01:35 AM

This group meets once a year, in August. It's the ALT-AST telescope group. I heard about it 3 years ago. I offered the information I had on silvering, added it to their report. I believe they will announce on CN in a new posting.

 

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#206 totvos

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Posted 09 October 2019 - 06:27 PM

Where does one access this data?

https://sites.google...opemirrors/home


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#207 Oregon-raybender

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Posted 11 October 2019 - 01:47 PM

There you go. Thanks Tom, Did not know it was up already.  bow.gif

 

Be safe using the chemicals, read, understand and follow the safety directions!graduate.sml.gif

 

 

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#208 Bob4BVM

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Posted 11 October 2019 - 11:13 PM

Wow. I just read thru all 3 of their papers and all I can say is, Wow !

This is exactly the kind of detail I was looking for on silvering.

What is especially exciting is their test with the anti-tarnish coating which predicts a silver coat life that is competitive with aluminum !

I'm definitely going to give this method a workout when I get my binoscope running. I was dreading the risk of shipping off two 17.5" mirrors for coating so this is a complete game-changer for me.

Hats off to these guys for sharing their research  and Thank you for making us aware  of it !

CS

Bob


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#209 totvos

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Posted 12 October 2019 - 10:13 AM

And despite Zane's results, which I suspect are due to stale chemicals, the process really is simple as long as you are fanatical about cleaning. The beauty is that if your attempt fails, wipe it off and try again. For reference, though, my chemicals are over a year old now, only being stored in my basement, and my last silvering was my best. My next attempt will be interesting, when it comes time for it.

 

If there is more to discuss, we should go off Zane's build thread...


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#210 hbanich

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Posted 12 October 2019 - 03:30 PM

I started a new thread about the spray silvering pages at

 

https://www.cloudyni...o-pages-are-up/


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#211 Augustus

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Posted 14 October 2019 - 03:37 PM

Time to test uncoated......

 

10inchcompleteds.jpg


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#212 Pinbout

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Posted 14 October 2019 - 05:27 PM

Time to test uncoated......

 

attachicon.gif 10inchcompleteds.jpg

Uhmmm... what have you been waiting for? To get even colder? lol.gif lol.gif lol.gif


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#213 Augustus

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Posted 26 October 2019 - 05:51 PM

Looks like first light with the coated mirror will be November 4th. Brief tests I got on Saturn with the uncoated primary looked promising as did the star test.



#214 Augustus

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Posted 30 October 2019 - 04:41 PM

And we are done:

 

image0.jpg

 

I'd post pics of the scope but my living room is a mess.....


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#215 Bob4BVM

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Posted 02 November 2019 - 12:45 PM

And we are done:

 

attachicon.gif image0.jpg

 

I'd post pics of the scope but my living room is a mess.....

Remember the center spot before you go out to collimate ! :)




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