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

["Jerry" <wa4guu@verizon.net>]

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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