Assuming it is electric (110 or 220VAC), then install a relay to short the phase and neutral to the motor together AFTER the mains has been removed. I can supply a small schematic if needed, just ask.
This will stop the motor in about 0.5 seconds. In fact good machines of this type usually have this already built in!!!
If its not electric, I give up!!!
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"A lie or untruth is halfway round the world before the truth has got its trousers on" Sir Winston Churchill
