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

In order for this to work, you need a gear tooth sensor, which is a hall
effect sensor with a built in biasing magnet. It will read High when there
is ferrous metal 0.5-2mm from the sensor

On Sat, Sep 11, 2010 at 03:05, Tony Smith <ajsmith@...> wrote:

>
>
> > > 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
>
>
>


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