Re: [ATM] PLOP Calculations

[Andy Saulietis <iss@pvtnetworks.net>]

Hi Michael, group:


>Start Plop, click on "Automatic Cell Design". Put in the numbers it asks for.
>Take a guess as to how many points you'll need. When done, click "Start" to
>start the optimization. When it's done, if the "Visible RMS Error" number is
>less than 4e-6 (a suggested stopping point - you can accept a design with a
>higher RMS error - you are the boss) you are done. If not, click "Automatic
>Cell Design" again and change the number of points...


I'm designing the cell for a 37" f4.6, 2" thick primary, with
a 6.4" secondary.

Plop seems to work OK at 27pts with variable angles,
the RMS is <4e-6.

Anything >27 points gets messages about missing
files and 'cell design not implemented yet'..
I d/l's Plop a couple of months ago..do you know
what's going on here??

I'm also thinking about using a heavy roller chain for the
sling, with the refinement of adding short shafts every
few links in the spaces between the chain links..each shaft
end would carry a small bearing that contacts the mirror
edge..the idea is that if there's differential expansion between the
chain and the mirror, that the bearings would eliminate the stress.

Also, each of the 27 cell support points could be a small
bearing alined so the axle is perpendicular to the radius
of the mirror at that point..thus allowing the supports to expand
or contract relative to the glass without adding stress.

What U guys think about this??

Andy



Andy Saulietis
ISS Enterprises
10 Milky Way
Mayhill NM 88339


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