Re: [CAD_CAM_EDM_DRO] Tach Sensor

Bill
If you are using magnets the inexpensive Hall effect sensors work well and
have a logic output.
available form DigiKey . Radio Shack has some very strong magnets about the
size of a kitchen match head.
They may even have the hall effect device. they are small 3 lead TO93
package.
you would need 5vdc and 1 4.7k resistor.
How do you want to read it?
Jim

----- Original Message -----
From: "William Scalione" <wscalione@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, June 08, 2003 11:25 PM
Subject: [CAD_CAM_EDM_DRO] Tach Sensor


> I could use a little help with a tach sensor.
>
> I have a Red Lion Controls Cub5 Counter/Rate Indicator that I would like
to
> use for a spindle tach on my Dyna-Myte mill
> http://www.redlion-controls.com/products/doc/01012.pdf
>
> The sensor trigger levels are
> Vih: 4.2V min
> Vil: .5V Max
> V Max: 28VDC
>
> Current sinking: internal 40KOhms typical pulled up to 5V
>
> Ok, I assume the Vih is the min voltage pulse required to trigger the
> counter. Red Lion sells a magnetic pickup as an option for the sensor.
Could
> I simply mount 2 magnets on the spindle pulley 180 degrees apart (for
> balance) and a coil of wire wrapped around a steel shank, placed close to
> the magnets as a pickup, and if so, will that generate somewhat close to
the
> voltage required to trigger this thing? Will some sort of pulse shaping be
> necessary to clean up the pulses?
>
> If I will need an amp or pulse shaper for the above, should I just use a
> photo reflective or interruptor type sensor to put out a 5V pulse to the
> counter? Is there one, that anyone knows about, that requires no external
> circuitry, just Vin and ground and outputs the required pulses? Photo
> reflective would be prefered. Price is no object as long as it's cheap.
>
> Thanks from the electronically challenged.
>
> Bill
>
>
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