Home Switches & Slave Axis in Mach 3

[JAZZCNC]

You need each switch on slaved axis on it's own input then go into Config/General config and unset the "Home Slave with master Axis".
Should work now.!

TIP: To test click the switches manually by hand well before axis gets near switches. Keep hand over E-stop just in case it doesn't work.. . .Simplizzz.

Setting them has limits won't make any difference because Mach ignores Limits while it's homing when sharing switch.

[Shinobiwan]

You need each switch on slaved axis on it's own input then go into Config/General config and set the "Home Slave with master Axis".
Should work now.!

That works fine for a single switch on a dual axis but if you want to home each of the two sides of the gantry independently ie. to auto square. then you leave this disabled. It could be you had this enabled and that's why it crushed your switch since it ignored one and looked only for the other.

What you have to do is:

• In general config set 'Home slave with master axis' to disabled
• Make sure you have each of the two switches on a separate input to Mach. Auto squaring doesn't work with the switches in series on the same input. Note: You can have all your switches in series bar one of them on the dual axis thus using only two inputs if your restricted
• In ports and pins correctly assign the inputs to the switches and test them to make sure their working as intended. Take care to ensure the correct switch corresponds to its associated axis. (assume you know how to do this since you already have working switches on your machine)
• Check that your motor tuning is identical for the Master and Slave axis because once you start to home they run independently and are no longer slaved during that operation so Mach will use these settings - if they're different you'll twist the gantry.
• Go into homing and soft limits setup and check that the Master and Slave axis settings are identical here too.

Some additional advice. If your using the cheap mechanical switches ditch them, they really are shit. They bend so easily and not particularly accurate in general. If you can ensure that no swarf is going to get to them then inductive proximity switches are far better since there's no mechanical action. I use these and found them to be dead on accurate and its impossible to crush them - bonus! lol

SN04-P 4mm Approach Sensor Proximity Switch PNP NO DC 10-30V 200mA New | eBay

[JAZZCNC]

Good spot Ant.!! . . It should have read " Unset the "Home slave with master Axis" " . .