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

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "David G. LeVine"

>
> Not so daft. A large coil will work, then 34 turns with a 3'
> circumference (about 1' diameter) should do the deed. A good air
> pump and a ctach basin and you are golden, even dust and dirt are
> taken care of!
>
> An elegant solution indeed!

Gotta love pi. Flexible hose would be the cheapest option just pulled
around a drum. Getting the airflow over that length may be an issue
however, shame you can't do it with water.

Another metering option might be to wrap it on to a large grooved
drum, if a contant tension was applied you could get good
repeatability, wind on, wind off.

This all begs the question, just how long is a piece of string?

Graham