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Re: [ATM] Not tde or tue, important oblate spheroid, ellipsoid
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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