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

On 9/11/2010 2:55 AM, Michael Fagan wrote:
> 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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