Re: Optical mouse for DRO anyone? - not for WIRE!

>In CCED, "R Wink" <rwwink@...> wrote:
>The point was to have a way to measure the thickness at any point
>along the length. If the roller is a known diameter and you use
>that dimension in your length calculations, you are using an
>estimate of the amount of collapse of the cordage. By trapping the
>cordage between two rollers and measuring the collapse (increase/
>decrease of the center distance), the travel amount would be more
>correct that using an estimate.

Yes. That's what I understood you to be saying...

What I'm pointing out is that many types of braided material will
NOT increase in thickness when they are lengthened/shortened. they
will change in width instead.(when compressed, between two rollers,
their change in length is reflected as a change in width.) This
means measurement of the center distance (of two rollers with
cordage between) will have no relation to actual material length;
therefore it doesn't increase the accuracy of the measuring
setup/system.

As Dan M recently posted; your idea is appropriate--even necessary!--
for solid materials like wire.

Hope this helps,

Ballendo