3 Axis CNC router

[Neale]

That looks about right.

[JoeHarris]

That looks about right.

Splendid! Thanks for your help. I'm going to try and find time to draw it out once more as a complete circuit to be sure before I start...

[JoeHarris]

That looks about right.

Here goes, I think this is my finalised estop and fault circuit:

[JoeHarris]

Limit switch circuit:
Home proximity switch circuit:

[driftspin]

Limit switch circuit:
Home proximity switch circuit:

Can i ask a question about limit switches / estop wiring here since it is kind of on topic? Dont want to hijack this topic.


When hitting estop/limit switches, can 68volts be shutoff.. or should/can the enable contact on the drives be used?


BTW Joe the hand drawn schematics look very good.

Grtz Bert.




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[Neale]

Joe - that looks fine, except that you don't need to use three inputs on the CSMIO for the limit switches. They can all go into one input, and in the Mach3 configuration screen you point all the max and min limits for all axes at that pin. You are using home switches separate from the limit switches. No problem with that, and the wiring looks OK. I'm assuming that you have NPN NC switches. By using separate inputs for the home switches you give yourself the possibility to home more than one axis at a time. Typically, you might configure Mach3 to home Z (to get it high up out of the way) and then home X and Y simultaneously - saves a little bit of time during the homing sequence.

Bert - some people consider hitting a limit switch to be an "emergency" so you could wire them in series with the e-stop switches. Personally, I have the e-stop switches trip the safety relay which turns off the 68V PSU, and also disables the drivers via the "enable" inputs and sends a signal to the CSMIO e-stop connection. My limit switches (like Joe's diagram) just go the CSMIO. Part of the reason for this is that I use a single switch for limit and home at one end of each axis, and I don't want a home switch to operate as an e-stop!

[JoeHarris]

Joe - that looks fine, except that you don't need to use three inputs on the CSMIO for the limit switches. They can all go into one input, and in the Mach3 configuration screen you point all the max and min limits for all axes at that pin. You are using home switches separate from the limit switches. No problem with that, and the wiring looks OK. I'm assuming that you have NPN NC switches. By using separate inputs for the home switches you give yourself the possibility to home more than one axis at a time. Typically, you might configure Mach3 to home Z (to get it high up out of the way) and then home X and Y simultaneously - saves a little bit of time during the homing sequence.

Bert - some people consider hitting a limit switch to be an "emergency" so you could wire them in series with the e-stop switches. Personally, I have the e-stop switches trip the safety relay which turns off the 68V PSU, and also disables the drivers via the "enable" inputs and sends a signal to the CSMIO e-stop connection. My limit switches (like Joe's diagram) just go the CSMIO. Part of the reason for this is that I use a single switch for limit and home at one end of each axis, and I don't want a home switch to operate as an e-stop!

Thanks, I thought that might be the case with regards to the limit inputs. The reason I have separate limits and homing is I wanted the repeatability and accuracy you can get with prox switches but the physical break you get with a traditional limit switch. Yes NPN NC.

[Web Goblin]

Is that not a dead short between 24v+ and 0v in the "on" switch?

[JoeHarris]

Is that not a dead short between 24v+ and 0v in the "on" switch?

I'm not sure if I've got this right as drawn tbh I'll check it because it works fine in practice.

[john swift]

I think you will find the switch is more like this :-



John