Hi Charles & Chris,

2 cents....

A possible partial solution for the 3-4" diameter....use old computer 3" hard
(actually ~3.1" or so) drives for the upright rolling "ends", with
holding spacers inbetween; and then mount your mass and use the
spacers for the screws adjustments.  They are light, tough, and have
precision diameters and have a nickel plated all over....and they can be also
be cut in two if really necessary.

Meredith

On 2/19/08, 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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