Re: [CAD_CAM_EDM_DRO] Re: Optical mouse for DRO anyone?

On Sun, 22 Apr 2007 14:05:17 +1000, you wrote:

>So you're building a wire cutter. In your case, what Ron suggested will
>work. Run the wire between 2 rollers, if you know the size of one of the
>rollers you can count its revolutions, that gives you how much wire has been
>played out.

Better with a turn or two around a biggish roller and a spring loaded
tensioner arm roller to maintain the friction. That's how a cable
company I did some work for measured length of fibre optic, wires and
Kevlar string going into the winding machines. The output after PVC
coating and printing used a simple opto to count the 1 metre markers
printed on the cable sheath.

Steve Blackmore
--