From: "Russell Jocoy" 
To: optic{at}gwi.net, atm{at}shore.net
Reply-To: "Russell Jocoy" 


>From: "CSC" 
>Reply-To: "CSC" 
>To: "Atm" 
>Subject: RE: ATM secondary mirrors
>Date: Mon, 7 Jul 2003 12:36:59 -0400
>
>
>Jerry:
>
>You've got spunk, not afraid are you?
>
>I think you need some more info and resources.  how about ATM books 1,2,3?
>Do you have these?
>
>Do you know the 3 piece test technique?  There's a way to determine if the
>interference fringes are from concavity or convexity, doing a simple calc
>and then figuring how flat each one is.  Once you've got a good flat piece,
>there's your reference.
>
>You could borrow a flat.  How big is your biggest diagonal?  I've got
4" &
>6" flats if you want to borrow one.
>
>Anyway, you'll be doing some fine grinding of the block of flats,  then
>flash polish for 20 minutes until you can check the surface with your test.
>if you're within 1 wave, you finish polish and figure.
>
>Pop them off the runner (backing disk), recheck to make sure no strains
>were
>excessive, and send to the coater.
>
>Hi Colin,
>I have a piece of 5/8" plate that is approximately 18" x 24".  I
>was planning to cut the pieces  for the diagonals (I need three)
>from this. I could use the balance to mount them on for grinding
>and polishing.  I am still researching the details of how to do
>this. I am getting excited about this project since my primary is
>basically done, short of an imense amount of testing to make sure
>that it is right this time. But I haave to have clear skies for
>really good testing conditions, which I haven't had for about two
>weeks.  Lets talk about the blocking wax. Obviously, I need it,
>and I didn't know that so I have some more research to do.
>Clear skies, Jerry
>
>
>
>


("atm{at}shore.net")

   Jerry,
      You nee a Willmann-Bell catalouge  (blocking pitch) and a Surpluss
Shed catalouge, since they
have reference flats of about 1/20 wave for a decent price andf a whole
lotta stuff  that might interest
you.     Russ Jocoy
("atm{at}shore.net")

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