RE: [CAD_CAM_EDM_DRO] Machine mounted Tachometer with Surface Meter Per minuteThis

> > Most routers have a nut at the collet. If using non-ferrous metals
> (or
> > wood or plastic), a hall effect sensor can pick up the points or cuts
> > (for ER type collets.)
>
> Can you elaborate a little on how this would work since Hall effect
> sensors
> are only sensitive to change in magnetic field.
> Gaston

Google 'gear tooth sensor'. The datasheet for the hall effect sensors
usually have this as well.

The sensor can pick up the difference between air & steel, if you're got a
gear with big enough teeth, it can pick when it's moving. Not sure it'd
work with the nut though.

Tony