Here's how they cast an 8m class mirror at the University of Arizona. This is for the Giant Magellan Telescope, not the VRO, but it also did that one. \ http

Here's how they cast an 8m class mirror at the University of Arizona. This is for the Giant Magellan Telescope, not the VRO, but it also did that one. \ https://www.youtube.com/watch?v=c-lBKuHqHk0 https://www.youtube.com/watch?v=c-lBKuHqHk0 Grinding and polishing is its own art. https://www.youtube.com/watch?v=ebqeygLdBYc https://www.youtube.com/watch?v=ebqeygLdBYc None of this looks easy to me.