Building a milling machine

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NormanV:
Andrew, I have not been able to remove the magnet, it is stuck in with high strength retainer and the hole is close fitting. I tried a larger magnet (20mm) but the centripetal force threw it off.
I have no idea what to do next with the tachometer.
Everything else is working fine but now I have to wait until I can sell some photographic equipment in order to raise the cash to buy a combination table to complete this machine. ( is anyone interested in buying a Mamiya RB67 with a few lenses?)
In the meantime I will go back to the Stirling Traction Engine that I started a few months ago.

tom osselton:
Can't you shatter the magnet with a punch? All the magnets I have had break easily.

BaronJ:
Or you could leave the magnet as is and go back to your idea of using a hall device...

Will this pdf help ?

awemawson:
Norman,

We need to know what the sensor is on your rev counter. If it is a normal proximity switch it doesn't need the magnet. However just possibly it may be a Hall Effect sensor, although it looks like a normal proximity switch.

Can I suggest that you untangle it from your milling machine, power it up, and hold the sensor in your hand near the spinning chuck of your lathe. The chuck key holes should be enough to trigger a proximity switch. If this gives no response we need to investigate further.

NormanV:

Here's the spec of the thingamajig that I bought:-
Power requirement:DC 8--12V
Measure range : 5-9999RPM.
Clear zero: Automatic.
Clear zero time:about 10s. the greater the RPM value,the longer the clear zero time.
Refresh frequency: 0.2-0.5S@120-1200RPM;0.25-0.06S@2400-9999RPM.
Measure indication:RPM<5000,±2;RPM>5000,±3.
Display:RED 0.56” LED
Sign:Pusle signal,NPN 3 wires normally open.
Response frequency: 100HZ
Tachometer dimension:72x36x20mm,panel cutout Dimension:68x33mm.
Sensor dimention: M12x10x55mm.
Detection distance: 4mm
Sensor wiring: brown-Power+;blue-Power-;black-signal.
Operating temperature: 0 to 50°C.

Packaging include
Tachometer x 1
NPN proximity sensor x 1

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