I am new to this list, so this just may be a rant, but the purpose of a E-Stop system, (and I do mean system, as this is how it should be looked at) is NOT to remove power from a machine, but to FREEZE the machine in place, at the expense of damaging the machine. (and possibly saving somebody's life)
I have been seeing info being given out on this list, where people are giving out advice to just hook up a E-Stop button to the power supply to stop a machine. This info MAY work, but it is not the recommended way to do things. I look at that big red button on most machines as nothing more as a power off button. Here is an example that I can give you: Say somebody builds a hydraulic, or worse, pneumatic Z-Axis. If someone gets there hand stuck in a part directly under the Z-Axis, and they hit a E-Stop that removes power from the machine, then that person's hand will will sustain serious injury. the spindle will still be turning for a couple seconds after power is lost, and the Z-Axis, with no power holding it up, will start to fall. A small diameter end mill can cut a nice round hole quickly through flesh. I am not saying that a hydraulic/pneumatic system is PRACTICAL, but I am saying that people will do anything, and there are other systems that can fail in a similar fashion. A punch press is one of them. Nobody knows what somebody will be using this software for, and just using a blanket statement to remove power from a machine, WILL hurt somebody eventually. ------------------------------------------------------------------------- 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
