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Re: [ATM] Not tde or tue, important oblate spheroid, ellipsoid
Excuse me,
I have forgotten for adding the end of sentence as
below;
> Firstly I should explain that is before I have never
> used any strokes for figuring as W. While polishing
> only carried on 1/3 COC TOT and MOT equal times.
than I saw TDE on my mirror and have worked for long
time (I think 3 - 4 times about 1 - 2 hours each time)
COC short stroke only TOT (1/4 maybe more short) for
correcting TDE as suggest many of people.
--- lütfü çakmak <lutfu_cakmak@yahoo.com> wrote:
> Hi,
> Jerry, Thomas, Mitchell and all who replied my
> message. Thanks for your comment and suggestions.
>
> Firstly I should explain that is before I have never
> used any strokes for figuring as W. While polishing
> only carried on 1/3 COC TOT and MOT equal times.
> But,
> my mirror gets curved lines in the course of time.
>
> Jerry, I did it which your first suggestions as "
> Strokes about 2 1/2 to 3 inches long (3 inch
> maximum)
> in a W about 2 to 2 1/2 inch wide (1 to 1 1/4 inch
> each side of center)" along 1,5 hours with testing
> sometimes. At the same time, I have not know that my
> mirror being oblate spheroid. After working here is
> ronchi;
>
>
http://www.atmlist.net/contrib/lutfu_cakmak-at-yahoo-dot-com/lutfu_12_29_2007/
>
> Than, I worked 1,5 hours too same strokes and here
> is
> ronchi;
>
>
http://www.atmlist.net/contrib/lutfu_cakmak-at-yahoo-dot-com/lutfu_12_30_2007/
>
> Than, I have seen no change on face and I discovered
> oblate spheroid.
>
> Than, I have polished my mirror 1/3 COC only MOT 3,5
> hours steady as Thomas suggestion. And I have seen
> still no change about ronchi lines. There are
> contrary
> to be normally inside or outside radius. Here is
> ronchi;
>
>
http://www.atmlist.net/contrib/lutfu_cakmak-at-yahoo-dot-com/lutfu_01_01_2008/
>
> Maybe, the best way is returning to fine grinding
> (800
> grid). Getting a good sphere than polising again so
> get rid of TDE etc.
>
> Happy new years
>
> Lutfu
>
>
>
>
>
>
> --- Jerry <wa4guu@verizon.net> wrote:
>
> > Hello Lutfu... happy new year.
> >
> > We seem to have hijacked your thread. I'll bring
> it
> > back to you now by
> > answering your question.
> >
> > You are right, it is oblate.
> >
> > I'm sure some of us did see your oblate shape. The
> 1
> > inch wide turned up
> > zone near the edge is part of the oblate. From
> > there into the center is
> > quite rough and is more important defect than the
> > oblate shape.
> >
> > The oblate shape is not a big problem. It is
> easily
> > fixed. It takes minor
> > adjustments of your stroke to make it go away.
> What
> > I suggested you do
> > should make the central area smoother and also
> take
> > the curve closer to a
> > sphere.
> >
> > Don't let the lap's channels close up. They don't
> > have to be so deep and
> > wide, maybe 1/4 inch deep and wide is a good size
> to
> > start with. You might
> > have to trim frequently to keep them about that
> > size, but it is good that
> > the lap will work very predictably. If you make
> the
> > channels deep and wide
> > and then trim when they close up there is much
> > variation of the lap action
> > from the fresh trimmed wide channel and the about
> to
> > be trimmed closed
> > channels. If 1/4 inch doesn't work well you can
> make
> > it wider next time.
> >
> > Press well before working and stroke slow. Strokes
> > about 2 3/4 inches long
> > in a W about 2 1/4 inch wide, give or take a
> little.
> > You can do this either
> > TOT or MOT.
> >
> > Slow.... Slow strokes. As slow as you can go and
> > keep the motion steady.
> > Work for about 1 hour and take another picture or
> > two.
> >
> > Or you can try one of the strokes others suggest.
> >
> > I like the inside ROC Ronchi. About 5 lines
> showing
> > on the mirror tells me
> > just about all I need to know in most cases. Some
> > other people like some
> > other way.
> >
> > Jerry
> >
> >
> >
> >
> > -----Original Message-----
> > From: lütfü çakmak
> >
> > Hi all,
> >
> > 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 ;
> >
> >
>
http://www.atmlist.net/contrib/lutfu_cakmak-at-yahoo-dot-com/lutfu/
> >
> > (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
> > for correcting?
> >
> > 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,
> >
> > Lutfu
> >
> >
> >
> >
> >
> >
> >
> >
>
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> >
> >
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> >
>
>
>
>
>
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