estop

[eloid]

i need some help locating a good estop circuit, I would have cnc4pc c23 break out brd... Just dont know how wire up a external relay to kill all power
to motors but keep break outbrd runing ,,, this is my frist project i have never step up mach3 so im still learning as i go.

can some post a link or drawing, I like to kill power to the router also.

[johnmac]

You can wire the E-stop switch to a pin on the BOB and assign it as the E-stop in Mach. No relays needed.

John

[eloid]

I need the relay for the router, want to power on and off and kill power (e-stop), and would like have hardware estop more for for safty.

[johnmac]

You can use a solid state relay for the router. It can be controlled directly from the BOB.

If you use the E-stop in the software, it will use the motors as electric brakes to stop the machine. If you kill the power, the machine will want to coast to a stop.

John

[Crevice Reamer]

You can wire this relay to provide power to router when steppers are powered:

http://www.surpluscenter.com/item.as...tname=electric

Estop will unpower steppers and allow relay to open, shutting down router.

CR.

[contactirfu]

Read this section below

http://www.mechmate.com/forums/forumdisplay.php?f=28

u have complete info here and also you can implement the e stop used here.

[eloid]

which link there so many

[eloid]

so with estop relay, at no point do you ever want to break power to you bob.... just power to motors ie gecko drivers and router/ spindle

Never had any hands experance yet with mach but after resuming from a estop can u continue cutting? with out lost steps? if not is there a way to pause... and resume?


You can wire this relay to provide power to router when steppers are powered:

http://www.surpluscenter.com/item.as...tname=electric

Estop will unpower steppers and allow relay to open, shutting down router.

CR.

[johnmac]

Just to clarify, the stepper drivers produce a high "step" current followed by a lower "hold" current. This lower "hold" current holds the motor to prevent the axis from moving when it shouldn't.

Now, when you hit the pause or stop in Mach, it allows the line of g-code in progress to complete before the machine stops. If you hit the E-stop switch connected to Mach, it will immediately stop sending the "step" pulses to the driver. The "hold" current will continue, working as a brake.

If you use a switch or relay to kill the power to the drivers, the motors will coast to a stop.

Either method can be used, it's up to you which to use.

John