In my day you could not use a machine unless you had done the training for it, I also remember having to go to Reading college after leaving HM armed forces to undertake a refresher course before being allowed to use machines again. These days though you can just go out and buy a spindle moulder for instance and start using it without any prior experience not knowing how dangerous the machines can be. In a workplace situation and at home you should never use a machine that you have not been trained to use.