On Tue, 2008-10-21 at 00:39 +0000, Chris Morley wrote: ... snip > 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! ... snip > Cheers > Chris Morley
My Hardinge lathe has a spindle brake that fits this modus operandi. http://www.wallacecompany.com/cnc_lathe/HNC/00061-1a.jpg It is like the magnetic clutch on the compressor of an automobile air-conditioner, except it has a permanent magnet that activates the brake when the power is off. An electromagnet is activated to counteract the permanent magnet to release the brake. I think it is enormously clever, but I am easy to please. Too bad they are expensive and can not be rebuilt. I made drawings for a spring loaded/pneumatic release version, but eBay came through on a new-old stock replacement. Kirk ------------------------------------------------------------------------- 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
