braking resistors and current interupt estop

Hi guys,

I need to add a hardware estop to my shizuoka cnc mill running EMC.
I am running fanuc 0 DC brush servo motors on x and y (60volt ~10
amp) and a fanuc 5 motor on z (80volt ~10 amp). I am running these
off of the itty bitty gecko G340 drives, and they work quite well. I
know that I want to have the estop button turn off the spindle motor,
and I am guessing it would be a good idea to cut the power to the
servo motors. :-) I found a box of 300 watt 5.1 ohm resistors and I
have a bunch of 10 to 20 amp relays...

Is the usual method to switch a resistor across the DC servo motor
leads and simultaneously cut the motor power to each gecko drive? It
seems it would be hard (large voltage spikes) on the gecko if the
servo motors are disconnected...throwing a low value resistor in
parallel with the motor leads would provide braking and drain the
filter caps quickly...

Thanks,

Rick