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

Thanks for the pointer. Unfortunately the max Operating Frequency for
this type of sensor is 12,000 Hz which is roughly the minimum speed of a
router.
Gaston

On 2010-09-11 11:46, David G. LeVine wrote:
> On 09/11/2010 01:22 AM, Gaston Gagnon wrote:
>> 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
>>
> Sure, assuming a magnetic nut (note, not magnetized, but capable of
> being attracted to a magnet), many Hall Effect sensors have a built-in
> "bias magnet" which provides the magnetic field needed for the sensor to
> operate. See the ATS616
> <http://www.allegromicro.com/en/Products/Part_Numbers/0616/index.asp>
> for an example and fuller write-up. The "gear-tooth" sensors (used for
> engine timing, for instance), are cheap and pretty rugged.
>
>
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>
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