Adding 4th/Rotary Axis to XYYZ CNC Router. A or C Axis ?

Ohh this is possible. I will check that when i am back in the workshop on tomorrow, but thank you very much for your quick reply. At least i now know that its not normal. I will check the connection on tomorrow and then i will update.
Thanks!

Its working, you were right. Thank you! 

Just one question, because i am a bit confused.

When i touch off my A axis it shows 0.000 on the DRO. When i then run the program, the A-axis rotates to the first position e.g. A-0.485, and it seems that everything is alright while dry-machining, but at the end of the program the machine goes to A0 (as it is in the code), but the A0 position is the physical position of A-0.485 .
So, the position from the touch off before running the g-code is after finishing program not anymore the same.
The "new" A0 is the first position where the A-axis rotates to, so A-0.485.
I need to check if its physically really at A-0.485, but i have run the program 3 times and always it was at the same position after the program has been finished.
Its like the program or the post processor creates a new 0.000 position, but when i restart the same program it does not anymore rotate to A-0.485, because it is already o that position. Strange for me.
(i can post the g-code on tomorrow, because i cannot find the usb stick right now)

Haven't used touch off much, so i will refrain from answering risking making a bigger mess!

I have tried to recreate the g code on my pc at home and i believe its about the same, so maybe someone will find out why such behavior.
*i am currently lerning what all those G codes mean, as for example G54, etc.

N1190 G53 G0 Z0.
That is at the start and end of your gcode, so it is returning to machine 0, not to material 0 where you set it with touch off.
"Material 0" is G54.
No issues with using that, just DRO will show different values depending on what G53/G54/G55 etc mode is in use.

Now i am getting it. I have learned something, thank you.
I feel a bit bad, because i have build a couple of CNC machines, but i am almost unable to write a simple g-code. I have to spend a bit of time working with g-codes.
Have a nice weekend:)