Card Scrapers

[Phil Mueller]

Got it. Thank you.

[Rob Luter]

Another way: cut the glass with big scissors underwater. The edge needs to be ground afterwards, but the glass won't break. I think this is because of the same thing that the kerosene does - fills in micro cracks as they are created so they are unlikely to propagate. I once used this method to solve a problem we had in the lab of making a round quartz glass window for a vacuum chamber.

JKJ

Surely you jest?

[Chet R Parks]

Rob,
He's not jesting, it works! I've done it with thin glass, you can't cut inside corners/curves but outside is fine. The reason that I heard it works is because the water absorbs the vibrations???
Chet

[Matthew Springer]

I'm still working on my scraper sharpening technique (after a decade of using them). My results got a lot better when I went over to a 1/4" carbide rod from McMaster. I found I was using too much pressure on the initial edge which was leading to a brittle edge. Using a more solid feeling rod (a 1/4" carbide rod is heavy) made me not press quite as hard, which seems to have helped edge retention.