and i want to convert it to do some cnc with it. i would need to milling head on it. i try to buy it on ebay (something not to expensive as it's for playing more then anything)
but i don't know what to write in the search box.
i try milling head for fanuc robot but didn't end up very far
The end of arm tooling for a robot almost always involves a custom made interface. You decide what the tool is and its relationship to the robot arm and that drives what the interface wants to be. An adaptor plate that mates robot to tool is usually made from steel and/or aluminum to fit the purpose.
I should also mention that robots don't read G code. You'll need a bit of specialized (and expensive) software to convert the proprietary code that normally runs a robot to G code..