How to cut a glass tabletop - GIF

[Frank S]

I'm not so sure if it is the self healing or the migration of micro fractures caused by the cutter. A pressure wave is created in the pane of glass when scored this wave needs to get relieved as soon as possible otherwise the micro fractures might create larger fractures.
Not sure if this is the reason but there is a high plausibility IMHO.

[PJs]

I semi apprenticed under a master glass guy over in Berserkly for a year off and on, making Tiffany style (foil wrapped) stained glass which typically is not flat or even thickness and breaking that stuff quickly is imperative. The glass composition itself has a lot to do with it as well as temp control. He made much of the glass we used with techniques that were beyond me at the time. He eventually migrated into making 14-15th century blown glass miniatures and worked in Iran just before all heck broke loose teaching the next generations glass making...got out just under the wire.

[metal2]

safety glasses ?

[ranald]

Interesting production ballet, well planned execution. Those men might be paid piece rate, or are the company proprietors.

Or, it's baseball season in the neighborhood...

SURFs UP! Duck season?

those guys are well experienced at it and the perps are done before video, as stated elsewhere. Maybe the speed has been enhansed as an accident at that rate, is a strong possibility.

My experience cutting framing glass ,mostly 2mm, use a minimum oil (like wetted carpet) to rub cutting wheel (or edge) over for lubrication to lengthen the life of the cutter & causing lubrication on the very hard surface. As for runs: they usually dont occur if the glass is scored from end to end. I used a technique where I started about 6mm (1/4") in from start end and go back to edge & then forward to other end & all this only takes a couple of seconds at most. Phone calls after score & before break, didn't affect the outcome. the ball of the cutter can be used to gently tap the slightly lifted panel though I preferred special glazing pliars to cradle the score, lift & clamp=snap=perfect break. ALL relies on original score. I've seen more experienced guys do it without a full score but sometimes the unfortunate happens.

[tonyfoale]

The question of rapid “healing” is absolute rubbish - a minute or two, an hour or two etc etc etc makes no difference.
Cutting glass is all about a very fine scratch and confidence!
Jim P

Several decades back one of our kids scratched a mirror. We are still waiting for it to heal.

[Jon]

[ranald]

a cut above the rest.

[Jon]

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[Toolmaker51]

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??? x 2.
I agree.
Where are 6" disks of fragile thin glass used in that quantity?

[Jon]

??? x 2.
I agree.
Where are 6" disks of fragile thin glass used in that quantity?

And where are the discs being thrown, where at least they're not breaking against each other?

And the sleeves? Is that safety gear; but what about the grommets?

And gloves/sleeves PPE, but no eye protection?

And the wagon wheel cart?