Jinx, One Idea I seem to remember is that you place the glass in question under water. This dampens (sorry!) out the vibration that can lead to shattering etc. Also acts as a coolant. The big problem IIRC is getting it started - once you have a slightly roughened surface the drill has something to work against. Otherwise - grinding paste??? Richard P I've got some ideas for using electronics with glass (1.5-3mm) and would like to drill holes in the glass to pass wires, mount LEDs etc. I went into a local glass supply store and was told that diamond drills, which according to the web appears to be the recommended way, start at $200. Ouch. Or I could have them do the holes for me at $6 each. Ouch. They suggested cobalt twist bits as a poor 2nd choice. I've some 1mm PCB Co drills which might do for wires but I'm not banking on it. As I'd planned to do some bending and sealing with a gas torch one other possibility is to use a small tip with oxy-acetylene and blow a hole, but that seems like a pretty crude way to do it, and there could be problems with heat and cracking Any other ways that might be worth looking into ? TIA -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu