Doug wrote:

    On my 120 volt chop saw ,it creates some kind of reversed current or field
which works through the on/off switch. (first thing to burn out in the switch)
I assume that our heavy use in the cabinet shop creates quite a load and I also
assume that the blade turning creates the reversed load .These elect.brakes can
be purchased for machines independently but they're heavy and 4x the fan cost.
How about a solenoid that engages when the fan turns off ...mechanically it
would be a friction clutch as Jeff mentioned or a band around a hub like a go
kart brake.
    I'm way out of my league here, but I can dream with the best of them. :>)

 
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