[ATM] Re: Hyperbola and TDE - Tenacious

[Jim Burrows <burrjaw@earthlink.net>]

At 2005-01-26 10:01 -0800, Jay wrote:

>Essentially, I am applying your suggestion to parabolize, but first I want 
>to work on that TDE just a bit more.  Interestingly, Sixtests indicates I 
>should press down at the zone 3/4 boundary to eliminate TDE relative to 
>sphere, but eliminating TDE relative to parabola would require me to press 
>down at the mid-zone 4 area.  The different between those two locations is 
>less than 1/4 inch.  I hope I can be that precise, and still be random.

The thread title is wrong - it's just an ellipsoid now <g>.

I'm pretty sure pressing here or pressing ¼" away won't make any 
difference.  The only way to get that subtle is to use a small tool (slow) 
or a specifically designed starlap.

Here's the Sixtests input file with a new conic target:
-----------------------------
Jay Killea, #27.
202.4   0.0     Mirror, obstruction diameters (mm)
Foucault
0.0     Source distance (0=moving source)
y, mm   X, mm
           18.263 5.6134
       50.698 5.6020
       74.790 5.1511
       92.956 6.2281
*
-1.000  2602.389        Conic targets:  b, R (mm)
0.1500  Measurement std deviation, mm
2597.9  Longitudinal reading bias, mm
----------------------------------
If you click "Target", you'll get the deviations from a parabola with an R 
0.1 mm shorter than the best-fit.  Note that the center is good and high, 
and the edge wiggles, including the TDE, are quite small.  Since you're 
already between sphere and parabola, b=-.385, there's little point in 
trying to return to the sphere.  Continue with the center-deepening 
parabolizing strokes.

         -- Jim Burrows
         -- mailto://burrjaw@earthlink.net
         -- http://home.earthlink.net/~burrjaw
         -- Seattle N47.4723 W122.3662 (WGS84) 

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