My first CNC finally arrived! (6040)

[Fred]

Have fun. My final tip - don't spend ages threading cables through the cable chain only to find each piece clips open on the inside.

Anyway, it's New Year's Eve. There's a glass of vodka that's calling me.

[d4cnc]

Hi, I'm looking into the possibility of adding home switches and limit switches currently, and am a little unsure on the best route to take with the standard electronics it came with..

There's a terminal block that appears to be for limits & it's where the emergency stop came connected at the moment.. as a normally open.. with a connection to ground when activated.

Am I right in thinking I can do the following? (Using simple micro switches as limits, and inductive switches as homing.)

PS Fred.. I don't see anyway to open up the cable chain I have.. The only way is to break them apart to make things a little easier I think.. unless I'm looking at it right..

[routercnc]

Hi d4cnc

Adding the limits to the e-stop circuit would work as drawn - however, it's a bit unusual for them to have configured it to be normally open. It's a bit safer to be normally closed when running in case a wire breaks etc. and it doesn't work when you press the e-stop.

Adding proximity sensors for the homes is fine but be aware they have 3 wires and run off 10-30V, so they wouldn't be drawn quite as you have drawn them. They also send out 10-30V as a signal so check the board can take this as an input as it could be 5V max.

[d4cnc]

Thanks for the advice.. yes always active would be safer but I'm not 100% sure about the controller board I have and how easy it is to wire as such.. I believe it's similar to the earlier version shown here. Although mine is a v3.9 with extra jumpers.. I was just following on from the way the E-stop is wired from the factory.. but I can of course change this.

http://i01.i.aliimg.com/img/pb/438/2...277438_868.jpg


Perhaps for the limit switches I could use a relay instead and wire the switches in series.. Would this be a better route to go down? Or am I better off using a FET to switch rather than a mechanical relay?

http://oi65.tinypic.com/ok5vg7.jpg


I've not looked into the proximity home switches yet.. but the ones I have are 6V-30V so I was hoping to use them..

[cropwell]

Original Reply Post deleted for the time being.

I will get out a spare BoB and proximity switch and wire them up on a breadboard. Some prox switches do output the supply voltage, but I think this is just due to open collector leakage, and should not source any real current to damage the BoB, but I will check it out properly this weekend and post results. I use LJ12A3-4-Z/BX switches with a 12v supply without any problem.

Cheers,
Rob