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Equipment Discussions >> ATM, Optics and DIY Forum

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Duartealex
member


Reged: 11/03/11

Loc: Tuparendi, Rio Grande do Sul, ...
how to make a secondary mirror new
      #5234578 - 05/22/12 06:40 PM

Hi all,
I have blocks already cut side, now I have to know how they stay flat, these two blocks are more plans that did consegui.Eu flatness test plan with precision 1/4 lambda I won.
Could someone explain to me quite sure how I should do to make my plans side mirrors?





thanks


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Mark Harry
Vendor
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Reged: 09/05/05

Loc: Northeast USA
Re: how to make a secondary mirror new [Re: Duartealex]
      #5235262 - 05/23/12 08:07 AM Attachment (26 downloads)

You need to mount them on a block, with a surrounding glass, like these pics. I used beeswax. They are small.
Beeswax isn't very stable, so once you start, it's a good idea to finish them within a day or so.


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Mark Harry
Vendor
*****

Reged: 09/05/05

Loc: Northeast USA
Re: how to make a secondary mirror new [Re: Mark Harry]
      #5235267 - 05/23/12 08:11 AM Attachment (26 downloads)

The one above, was a 1" MA, done singlely.
The ones below were done as a 3-spot block. The test was done next morning, but you can see how the individual pieces moved slightly overnight. It helps to have a good reference flat to test with. Make sure you mount them and the blocking on a secure and firm backer, such as an aluminum disc. Mine are 1" thick.
M.


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Duartealex
member


Reged: 11/03/11

Loc: Tuparendi, Rio Grande do Sul, ...
Re: how to make a secondary mirror [Re: Mark Harry]
      #5266430 - 06/11/12 02:24 PM

I wonder what moves should I use them to make plans. And what color should I use light to highlight the more franjas.Lembrando I have two plans with precision 1/4 lambda.
Is there any link that explains how to do everything right?

Thanks
Alex Duarte


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