Dermot, my friend,Originally posted by Dermot Cox-Kearns:
Could someone explain this thing I read about glass healing, I have run this past people who have many many years experiences in the glass business they wanted to know if I was MAD or .........................it makes no sense to me and I have cut hundreds of tons of glass and mirror in my time.
Is there some true fact behind this healing thing or is it just some urban myth.
Thanks Wayne -- I hope this helps everyone.Yes, there is a phenomenom called "healing". If you
delay breaking out the scored glass for some time itis harder to break. The reason is theoretic, but here are two possible causes.....
-- 1. Picture (pun) the fissure as a very clean crack. At the bottom, where the crack disappears, it is being jammed back together by the compressive nature of glass surfaces. There may be a molecular re-attachment of glass molecules which makes the fissure less sharp
at the bottom, therefore, breaking is harder to start.
-- 2. Silicon-dioxide, major component of glass, can be dissolved in water, or moisture in the air. Such action is more likely at the clean bottom of the crack.
I prefer #1, but Encyclopedia Brittanica describes #2. The action of "healing" can be affected, either enhanced or retarded, by many factors such as moisture in the atmosphere, dry cut vs. lubricated score, elapsed time, etc.
You've got it Dermot. Few of us leave our glass sitting around for days before breaking, which is probably how long the "healing" process might take. Years ago, I recall some framers saying, "Hurry now! Break that glass, before it heals....... " When you first heard that concern, it was a bit like an "Urban Legend".Originally posted by Dermot Cox-Kearns:
.....Reality is that I score my glass and snap it, I have never left it lying around to test this theory of healing, I will now even though the exercise will only be academic for me.
Bog,Originally posted by Bogframe:
Up until a few years ago, I had a diamond-tipped glass cutter that did a swell job on glass of any thickness with very little pressure needed. Some moron who worked at my shop dropped it onto a concrete floor, chipping the tip and ruining it.Does anyone here know of a manufacturer that still makes these things, or does someone have one that they would be willing to part with?
I think I'd try ANYTHING called Bohle Silberschnitt 4000. This is clearly not some wimpy, gold-tipped glass cutter from Home Depot!Bohle Silberschnitt 4000