Try a diamond wheel.

John

"Ken Sterling" wrote in message
s.com...
Gang,
Got a piece of glass tubing (similar to Pyrex) which is .490 ID,
625OD and I need to cut a piece about 11/16 long. File won't touch
it, glass cutter won't do it, have been trying to score the outside
with a thin "cutoff wheel", which scores it, but the stuff won't "snap
off" as expected... just shatters, even past the score mark. Am I
going to have to cut completely through with the cutoff wheel to do
this?
Ken.