When I was in the glass industry in the late 70s-early 90s the wired glass used in fire doors was polished clear at a site in Doncaster. The cast iron grinding heads arrived as a raw casting and were surfaced on a huge vertical milling machine that rotated the 10ft dia casting underneath the radial milling arm above it - spectacular to watch.
appolgies to the original poster if we’ve hijacked the thread
appolgies to the original poster if we’ve hijacked the thread