glass melting

[astrotecnico]

To carry out serious autocollimation, you need a mirror with a diameter equal to or greater than that of the mirror you are doing, so for 1 meter it takes a floor of one 1 metro, with hole in the center and with surface precision 1/10 wavelength. Unfortunately I cannot have such a thing and therefore I have to do differently.

For the primary

1) hyperbola generation with measurements made with Foucault using the Texerau formulin

2) I also use the Ronchi reticle

a lot of patience and a good dose of luck !!!

For the secondary

1) generation of the shape with verification of the fringes on a spherical mirror (as for the Cassegrain)

2) once the primary is well done, continue to work on the secondary, checking with mirrors mounted on a distant point source (artificial star)

and here too much luck !

Or a nice Zygo interferometer and let's solve the story

This is basically what I think I am doing …… then there will certainly be variations during construction, as always

However I also have a home made Bath Interferometer which helps in more serious cases …………..

[Massimo Marconi]

But The calculation of the curve, it can also be done through software that gives us the exact values ​​of the draft for Foucault even in the case of elliptic or hyperbolic conics, or am I wrong ?

I apologize to Maurizio if I took advantage of his discussion to ask all these questions to the astrotechnician. For the next ones I will open a special discussion as I would have a lot of it on this topic…

[astrotecnico]

Of course it can be done with software, even better !

[Author]

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