Limits, homes, override switch

[JAZZCNC]

You can and you can't share the Switches for both jobs.???? . . . . . . You can if you don't put the switches thru the Relay. The relay is a problem for Homing because of delay which you don't want.

If you want the Limits to run thru a relay then you need separate set of switches for homes.

Now personaly I don't have problem with running Limits straight to inputs provided the input can accept 24V to lessen chances of noise. Lots of BOB's are 5V only so this why relay is used so can still run 24v thru the long path to switches but keep the 5v signal line short and lessen chances of false triggers etc.

If your BOB can take 24V then Mach will allow you to share switches to do both Jobs.
So if you want Home switches (which I suggest you do) and don't want to fit extra switches (which I suggest you do) then remove from going thru the relay. Just keep relay for emergency stop.

End of the day Limits are Not Emergency stop but rather positional loss and has such only need to stop the control or disable the drives. They don't need to kill power completely.

But for sake of couple of £££ then I'd fit Home switches. In fact if had to lose one or other then I'd have Home switches before Limits if as they are far more useful and you can use Soft limits if need be.!

[eurikain]

It is not usual to have a Z-- switch. If the object of the Z-- limit is to stop you crashing the tool into the machine bed, you need to know the tool length, so Z-- is pointless.

Not sure I follow you, I have to learn / watch / read more about homes in order to do so. I'll watch the links you gave me later tonight :)

I haven't looked in proper detail at your wiring diagram, but my first impression was that it was over-complicated. I can't understand why you are talking about 10v and 24v as the BoB input pins are 5v, any higher and you could fry the board.

Yes sorry I meant 24V and 5V. 10V is for the spindle speed control interface.

Now personaly I don't have problem with running Limits straight to inputs provided the input can accept 24V to lessen chances of noise. Lots of BOB's are 5V only so this why relay is used so can still run 24v thru the long path to switches but keep the 5v signal line short and lessen chances of false triggers etc.

Yes, this is why I use a relay for my limit switches. My BOB can't take in 24V.


For now, I've wired all six switches together in series, and the limits now work fine. So does the override switch and buzzer. I can't work the process of getting off a triggered switch no problem. But I'm missing homes. I could share the job on the same switches, but the relay implies some risky delay (are miliseconds really that risk JAZZ ? That's where I'm not too sure...). I'll order three more switches online for the sake of completeness of the machine, but I'll use it without homes until they arrive. Now, can you tell me what kind of switches I should get ? Laser or same type of mechanical switch ?

[valdis034]

So the best option is to use resistor and take 24v straight to bob?

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