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

Bias the nut with a magnet -- put the magnet close to the nut on one side
and the Hall effect sensor on the other side of the nut.

The nut will couple the magnetic field and modulate the sensor.

Dave

> -----Original Message-----
> From: CAD_CAM_EDM_DRO@yahoogroups.com
> [mailto:CAD_CAM_EDM_DRO@yahoogroups.com] On Behalf Of Gaston Gagnon
> Sent: Friday, September 10, 2010 10:23 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: Re: [CAD_CAM_EDM_DRO] Machine mounted Tachometer
> with Surface Meter Per minuteThis
>
> Hi David,
> On 2010-09-10 22:09, David G. LeVine wrote:
> > On 09/10/2010 10:49 AM, Gaston Gagnon wrote:
> >> Yeah, I know, I will have to take the plunge: open up
> the router, install
> >> something (?) and make hole in the body for the sensor but
> I was hoping
> >> (secretly) someone would come up with a way to derive the
> actual speed from
> >> router's internal speed control electronic. ;-)
> >> Gaston
> > 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
>
>
>
> [Non-text portions of this message have been removed]
>
>
>
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