[ATM] Not tde or tue, important oblate spheroid, ellipsoid
thomas at moiler.com
Mon Dec 31 18:57:36 JST 2007
Happy New Years, from Australia!
Your oblate spheroid can be corrected by doing 1/3 centre over centre
strokes, if you don't want to change the focal length alternate tool and
mirror being on top.
This type of stroke will bring you back towards a sphere, so you have to
test and when you get back to a sphere (or if you're really luck you might
be able to stop at a parabola) start working on getting the parabola back
When you get close start working with quite short figuring spells 5 to
10mins towards the end, and take your time!
PS I'm sure there are going to be other suggestions now that at least one
other person has weighed in!
From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
Sent: Monday, 31 December 2007 7:38 PM
Subject: [ATM] Not tde or tue, important oblate spheroid, ellipsoid
Interesting, nobody could see who replied to my first
message, about problem on my mirror and warned me. I
was concentrate on tde or tue like every atm. But,
couldn't see the big error on my mirror. Because the
ronchi lines are contrary to be normally inside or
outside radius ;
(images named ri=inside radius, ro=outside radius)
Well, when I put +1.5 value of conic on RonchiZ prg. I
see same lines on my mirror. I think that, this is a
oblate spheroid or ellipsoid, isn't it? What can I do
Another interesting thing, nobody discovered who
living a few atm in my country too. :-)
Apologize, my english language can not be properly.
Happy new year,
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