Hi all optic gurus !
Does anyone remember the formula which determines the cross base power to be cut- to an angle - which is used to set the Coburn generator head ? :)
From memory the formula has the cutting crown size in it eg 100mm, the:- n' of the lens material and power of the cross curve - to be cut- in mm radius- but it has been 30 something years since I saw this formula - so rather than trying to work it out from first principle - I am pinning my hope on the collective brain power of Optiboard Gurus :)
...or if everyone's memory fails - does anyone still have a coburn generator head angle chart ?
thanks to all in advance
Rob -o-o-
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