"Bill Noble" wrote in message
...
simple electronic way. Have a magnet on the rotating part. Place a reed
switch near enough that it closes every time the magnet comes by. Have a
timer you set to two seconds. Reset the timer when you presss "start",
and every time the reed switch is closed by the magnet. You can make this
timer from a 555 chip, or just buy a timer. If the timer expires, drop
out a relay to de-energize the motor.


You'll never be able to sell your brain for much...it's USED!
Thanks Bill.