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Hall Effect Sensor

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BaronJ:
Hello Norman,

what you have there is an "Inductive Proximity Sensor".  You can get them as small as 6 mm diameter and 20 mm long.  As far as "Hall devices" are concerned RS Components will sell you one over the counter or by post.  They are not very expensive !  The last time I bought some they were much less than £1.00p.   Now if you want to play around and salvage some, any computer case cooling fan will have at least one and usually two in it.  An old floppy drive motor will have upto four in there.

You should also be aware that there are several types of hall devices.  Some are simple sensors that will give you a variable output that depends upon the magnetic field strength, others are switches that will give a digital output, positive or negative going depending upon how they are wired and the magnetic polarity.  Some of the switch ones require one magnetic pole to turn them on and the opposite pole to turn them off.

HTH.

micktoon:
Hi Norman , as Baron said RS Components will sell what you need but its not too easy finding what you want at times when buying there. Another option you could look into is I have used the same type sensor as yours on my lathe but have also used a sensor from what I remember that was exactly the same but much smaller say 6mm diameter and 30mm long on a kit car speedo, I got mine from a place called Green Gauges that I think no longer exsist but if you google kit car speedo sensors you might find easy place to get one from without all the tech spec being needed ?

  Cheers Mick

NormanV:
Hi Mick, I've searched Ebay but can only find sensors in moulded plastic housings for £30 or more. I've given up the idea of a neat assembly and will mount the sensor that I have, it will just have to stick out!
Thanks everyone for your help.
Norman

hopefuldave:
I just spent a tenner.on eBay.for a 'gear tooth sensor' chip which comes with a built-in Nd magnet and supposedly works up to 5kHz, which works out to roughly 4000 rpm on my lathe, a bit faster than I need... It takes 5 - 24. Volts dc in and produces nice neat square waves, compensating for sensor gap etc. Much easier than making it up as I go along!
The chip is an ATS667, to me it looks ideal....

BaronJ:
There are other ways Norman could go...

Optical !  Using a reflective surface or broken beam.  Very cheap and very easy to implement.
Again if you know where to look, lots of salvageable parts sent to landfill.

 

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