Chris,
I thought I was only specifying a curve of 1000 inches, not 1000 feet., 
so back to about a 0.003 inch deflection in of a 6 inch long strip. 

Anyway, I just went out to the garage with a microscope slide, 
1.0x3.0x0.055", and supported the ends with Allen wrenches (a line 
contact) and it deflected about 0.025" before breaking so that converts 
to 0.0166" (16.6 thousandths) per inch -- well above the postulated 3 or 
so mills for a 10 second curve.
Charles Patton

ChrisAtUpw@....... wrote:
> In a message dated 2008/02/19, charles.r.patton@........ writes:
>
>> One possibility would be to find a flat piece of standard window 
>> pane, mount it, and provide tension screws to physically pressure it 
>> into the desired curve.  After all it
>> is only 0.001" in 1".  I think glass would bend that much.
>
>
> Hi Charles,
>
>        Much less than that. You specified a curve of 1000 ft, 
> presumably the radius.
>        If your strip is 6" long
>        Center deflection = (0.25)^2 / 2000 x 12 inches = 0.000375"
>
>        Regards,
>
>        Chris Chapman 

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