Anecdote: when my dad was a child, one of the main coffee machines in the entire village required the slow work of a donkey attached to crankshaft to grind the beans.<p>One day, someone decided to mechanize this process, and attached it to a motor. The whole village gathered to watch the stunt, and my dad says the machine literally exploded from the speed.<p>No one was injured but parts of the machine could be found far away from the centre for a long time.