I picked this up from a friend recently. I'm sure we can use it for more than just stained glass grinding, but if anyone is into that hobby I'm sure they will find this useful.
The Glastar Super II Grinder is a glass grinder that artist, hobbyists, schools, and studios will enjoy. Save time by grinding down uneven glass to make your glass fit your design. The Glastar Super II Grinder features a 1/2 hp motor and comes with a 3/4" and a 1/4" grinder bits, and a 5 year manufacturer warranty.
https://www.youtube.com/watch?v=03JMwdF0PF8
Let me know if you have a use for this tool at Arch Reactor.