I can't speak for the rest but factory "machines" are built to last in most cases and have long warranties and easily swappable components. Most of what's there can be machined in a pinch. I went to a glass factory one that had some machines that were 70+ years old. When something broke, which was pretty rare, they simply machined a new one. On a tangential note I expect my Lodge cast iron cooking set to last at least one lifetime :D