E-STOP Circuit - will this cause any problems?

[JAZZCNC]

Ermmmm...good question! I presume you mean limit switches to prevent the X, Y, Z from trying to drive beyond their physical stops? Although I've considered them, I was thinking that the stops can be set within the software, and if something went wrong, the drives would trip on overcurrent protection? Should limit switches REALLY be wired into the Safety Circuit? It seems wrong to me as they should be part of the machine functionality rather than an Emergency or Safety device?

Not wrong very correct and right.!! . . . They are safety limits so should be part of the E-stop system and again the software should just be informed not left in charge.!!

Edit:

The other beauty of running 24v thru limit switch's(And E-stop) is better noise immunity which can affect the standard 5V signal from Parallel port. The 5v signal is just used to inform software so the wire run is tiny just coming from BOB (+) input passing thru relay contact and back to (-) input so far less chance of picking up noise.!

[Web Goblin]

We have collision switches (proximity switches)mounted on our cnc machines at work at the cutting head and printer head mounts. These switches are connected to the emergency stop circuits to protect the machine and not the user.