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

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



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