-- >>> You do want to turn the motor power off at some point, but deciding when >>> is difficult. Consider a person whose hand is caught between a tool >>> (not spinning - no need to be gross here) and a vise. What you want is >>> for the pressure on the hand to go away - ie, stop powering the motor >>> into the hand. But, you want to be able to drive the axis back a little >>> manually, which can't be done if the drive is still commanding a stop >>> (or hold). >>> >> IMHO . power should always be off for E-stop. If you rely on powered items to slowdown/stop/be able to move after then you are relying on all these systems to work properly. One should remember that E-stop is also for when chips/coolant/stuck relays/fried electronics/etc create havoc in the system. Power should be cut to all drives as directly as possible. If your design creates movement with power off (such as gravity) then mechanical safety features must be thought of! E-stop is not for the convenience of moving the axis away from your caught hand, its for stopping the axis from removing your hand from your body.
Cheers Chris Morley _________________________________________________________________ ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
