Re: [ATM] flat making machine

["Everett Cairns" <ecairns@mcmaster.ca>]

If you lay a straight edge across the glass when viewing the fringes between 
the worst two pairs, how many fringes from straight is the pattern? As it 
takes 1/2 wave increase in spacing to go from one fringe to the next, this 
will indicate what your combined worst deviation is from flat.Makes a 
doublecheck on your calculations.

                                                                             
 Everett
----- Original Message ----- 
From: "shyam rathod" <iloveyawli@yahoo.com>
To: <atm@atmlist.net>
Sent: Saturday, November 26, 2005 9:39 AM
Subject: [ATM] flat making machine


> dear friends can anyone help me with a design or information on making 
> OPTICAL FLAT MACHINE?
>  i have tried making flat 4" ,newtons ring were not perfectly round and 
> then the curves were not perfect curved but were uneven ....i was making 
> three elements and calculating the curve by solving simultaneous equation.
>  i had been using a neon bulb (a mercury vapour lamp or a sodium lamp 
> could be used but found it expensive)
>  and hand grinding them now i want to make a machine.
>  my requirement is making a 6" optical flat making machine.
>
>
>
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