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25315

Re: cut a secondary at 45 Bon Soir, Jacques. Your problem is the aluminized coating. We apply a waterproof lacquer or shellac directly to the aluminum. We then wax and apply lens tissue

paul valleli
Feb 21
#25315
 

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25314

Re: cut a secondary at 45 Ok Thank I untherstand now howto But Mine are a glass of 1\4 only already alluminium on and only 1.25 inch in dia about I have a friend making

jacot
Feb 21
#25314
 

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25313

Re: cut a secondary at 45 hi, Look at this video , you need a diamond disc to give the glass the elliptical shape *Saludos Aldo Moraga Byers

Aldo Moraga
Feb 21
#25313
 

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25312

cut a secondary at 45 yes my problem is only that i compute whit program of allan sec the size of the secondary about 1.5 inch but now my problem is to cut it from a

savardjacques@ymail.com
Feb 21
#25312
 

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25311

Re: Adventures in making an optical flat I made an 8-inch Pyrex optical flat back in those days at E & W for my personal use. I would do the final testing of optical flats against their 10-inch fused

petemn2004
Feb 16
#25311
 

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25310

Re: Adventures in making an optical flat Guy,Peter,Peter: The making of an optical flat requires putting aside a lot of principles used for figuring telescope mirrors. We are after a true sphere of

paul valleli
Feb 16
#25310
 

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25309

Re: Adventures in making an optical flat Thanks Mark and Peter for your thoughts on this. If I got this correctly I literally flatten out the pitch using the flat itself then work it using slightly

Peter
Feb 16
#25309
 

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25308

Re: Adventures in making an optical flat ... Pitch-lap making , I do on a slab of Corian countertop material 1/2"thick which can take heat or cold and be cut with wood cutting tools and no noticed

Pete DeBaan
Feb 15
#25308
 

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25307

Re: Adventures in making an optical flat I would not go to the bother of grinding a larger disk just to make a pitch lap that is larger than the flat you are working on. Since you do not have to press

petemn2004
Feb 15
#25307
 

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25306

Re: Adventures in making an optical flat Thank you Mark for this wonderful explanation. We truly appreciate you sharing your knowledge. I currently have a concave surface and your point about

Peter
Feb 15
#25306
 

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25305

Re: Adventures in making an optical flat Thanks for the flat primer Mark, I have filed this away in the "Don't lose" folder. The day is approaching when I will use some of this info. Jerry

Jerry
Feb 15
#25305
 

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25304

Re: Adventures in making an optical flat Addition Just by the time I finish I thing that stuff are opact no light pass true How to test it??? Jack Interesting all these info I plan for several y

jacot
Feb 14
#25304
 

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25303

Re: Adventures in making an optical flat Interesting all these info I plan for several y to used the top of a broken inductive oven The famous black kind of ceramic stuff At the center of the

jacot
Feb 14
#25303
 

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25302

Re: Adventures in making an optical flat I used to work in the mid-1970's at E & W Optical in their polishing department. I polished and figured many an optical flat and telescope diagonals. Any easy

petemn2004
Feb 14
#25302
 

Messages List

25301

Re: Adventures in making an optical flat Guy, All the pictures you show have optical wedge in them except number four. This is what I call "fluffed - out". When there is curvature (power), the

paul valleli
Feb 14
#25301
 
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