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

Ooops! I confused things here. Some of these sensors (ATS616LSG) are
spec as max Operating freq of 10 kHz and others (ATS667LSG) as Operating
Speed of 12000 rpm.
Sorry :-[
Gaston

On 2010-09-11 13:00, Gaston Gagnon wrote:
> 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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