Re: [ATM] Plop Flop

["Jeff Anderson-Lee" <jonah@cs.berkeley.edu>]

Mark Holm wrote:

> Let me say one more thing on that point.  Kriege and Berry is a great 
> book.  The authors wrote the best they knew, but, they were working 
> with just plain bad methods when they sized and laid out their cells.  
> So was every other atm at the time.  Plop, with a (very) little help 
> from me, is going to give you a much more scientific result.

K&B is a great book, and as far as their cell design go, they work.  Not 
as optimally as a Plop designed cell perhaps, but with your mirror I 
doubt that anyone could tell the difference at either 18 or 27 points.

> Plop says the 18-point cell residual deformation will be approximately 
> 1/500 wave RMS.   If you think that isn't good enough, well (it is 
> hard to say it politely) you are mistaken.
>
> I hope that a couple of the other Plop experienced atm's on the list 
> will run your case at 18 points and back me up.  (Jeff Anderson-Lee 
> and Tom Krajci are you listening?)  The backup isn't for my peace of 
> mind.  I am dead certain of the result.  Just want to make sure I 
> convince you.

I'll second Mark, who is echoing other opinions as well.  27 points is 
overkill.  Not only that, but unless you are careful in the 
implementation you could end up with worse support than with an 18 point 
cell because the pieces are smaller and need closer tolerances in 
manufacturing.

> It would be slightly helpful, Jay, if you told us the glass type.  The 
> numbers will be a little different for different glasses.  Actually, 
> this design is so far from being critical that the glass type won't 
> matter a lot, but might as well do it right while we are at it.

In some cases the glass type would make a difference.  But in this case 
it won't make much difference for either an 18 or 27 point cell.

> I can and will translate the results into the same format used in 
> Kriege and Berry..

Or you could just use the K&B numbers for an 18 point cell.  They have 
worked for many ATMs before Plop came around and can work for you too.

Jeff Anderson-Lee


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