Precision manufacturing equipment requires regular maintenance and needs to be operated by skilled workers. You don't just plop a rock into a machine and get ob

Precision manufacturing equipment requires regular maintenance and needs to be operated by skilled workers. You don't just plop a rock into a machine and get object out. Managing work-holding is like 50% of the work. Generally you can operate only on some surfaces in one position and then you'll need to rotate workpiece/change tools/type of machine and somehow hold the piece and place is in the right spot with really high precission which is harder than it sounds.