Yep. It's unchecked.
.. I tried to check it also..

I've googled and YouTubeed but I can't get it to work.
Does anyone have an idea what I'm missing?

You have a switch on main axis and on slave axis, and they show up in Mach when triggered?

If yes then it has to be a software setting.

Yes I have and yep they do. 
Feels like I have tried everything.. Well I will start over.
From the top 

Before you do that, have a read here, may find some answer....

https://www.machsupport.com/forum/index.php?topic=25867.0

Thanx.
I will try to set up the B axis instead, just to be sure..

Hello.
Seems like my UC300 isn't compatible with homing a slave axis separated.

I'm trying to swap axis, but can't get this to work either..
Does anyone have code for this.?
I have found some but they didn't work.

I've started with dooembutton for z then y then x with slave a.
Then swapaxis a with b and dooembutton for home b then reset swap..
..but no success

Big thanx..

Best to confirm SwapAxis() is supported by your controller, good chance it is not.
If you contact the maker they will be able to tell you and if it does support it they can tell you the proper way to do it.
Hood

The UC300 manual list supported Mach3 functions, and SwapAxis() is not on the list.
Slaving is, though, and slaved homing should work.

Thanx guys.
I've tried a couple of things. I and I did get the swap axis to work. So that's good, and I can see in pins and ports that they have mowed from a to b, I and then back to a after reset swap. But the b won't home during doOEMbutton.. Yhy? The Uc300 shouldn't care about that, only what is locked in pins and ports ? Again, thanx all for your help!