Re: [ATM] Subdiameter lap simulator - updated

[Richard <cnc@cncservo.co.uk>]

Hi Bill,

Friday, January 4, 2008, 12:40:05 PM, you wrote:

BP> With this, the first approximation would be to assume that lap action is
BP> linear with pressure. Does anybody know if this would be accurate ?

More or less. It's known as Prestons constant and is C in the
following Prestons polishing equation :

dz = C.P.V.dt

dz(p,a) = Absolute glass removal at mirror position p, a
C = Proportionality constant in microns/hour/PSI/(meters/sec)
P = Local pressure (varies across tool/lap when it overhangs edge)
V = Instantaneous velocity of tool/lap element relative to mirror surface
dt = time


-- 

Best regards,
  Richard in the UK

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