Casting a light weight telescope mirror (all steps in the process)

In this video I show how I designed, cast, slumped and coldworked a light-weight telescope mirror blank prototype. The blank is 10 inches in diameter, but only weighs 4 lbs 13 oz. It has a ribbed back design for rigidity, and is pre-slumped to f/4.9. Please visit http://www.mdpub.com/scopeworks/index... to see more of my astronomy and glass casting projects.

Previous light-weight mirror projects: http://www.mdpub.com/scopeworks/hexag...

My home-made kiln controller: http://www.mdpub.com/kilncont/index.html

Astronomy and telescope projects: http://www.mdpub.com/scopeworks/index...

My Blog: http://www.mdpub.com

Equipment and supplies used in this video:
Insulating FireBrick 9" X 4.5" X 2.5" in (6 Pieces) https://amzn.to/2WzFzky
Rutland Products Black, 10.3 fl oz Cartridge Furnace Cement https://amzn.to/3fclZB9
Spectrum PAPYROS Kiln Shelf Paper (20 sheets per pack) https://amzn.to/2THsKDA
Fireworks 1-Pound Kiln Wash https://amzn.to/2UYare9