On Sun, 2008-02-17 at 09:12 -0500, Gene Heskett wrote: > On Sunday 17 February 2008, Rob Jansen wrote:
> >Oh yeah, and an emergency button won't hurt - may even save your > >machine, I was almost too late hitting the F1 button yesterday. > > The 'esc' key in emc serves as the e-stop if one is not otherwise rigged. > That detail however IS on the agenda for when the driver box gains a 4th > channel. My reaction here is for the newbee wiring enthusiast because I'm pretty certain that you guys already know that silicon mediated estop is only permitted under some very strictly controlled situations. A machine that requires orderly shutdown would be an example. Even then there are very rigorous requirements for the nature and number of the silicon junctions permitted and the voting process required in the software that handles them. We've had long discussions about naming what the GUI does when you press stop on the keyboard or a mouse click but they don't qualify as estop in the USA. (At this point some will say, "But you named it E-Stop when you wrote the mini graphical interface.") To qualify we pretty much need a normally closed loop of mechanical switches that pulls a relay rated to break the current supplied to moving parts. HTH Rayh ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
