how to cut and file toughened / tempered glass without it exploding (as all experts promised)

proof that using low powered diamond disc and coolant, you can cut and file toughened glass
i needed to take of many millimetres cutting and filing to avoid £150 remanufacturing charge!
my supplier and his factory production manager said it was impossible without it shattering as designed to.
i searched the net and youtube, all i found was shattering failures and non toughened glass successes.
i noted the 500w power tools worked initially but even cooled after a few mins shattered, got me thinking that the low power lighter tool might work, maybe a simple diamond file or carburundum sharpening stone??
well my first try succeeded, took 15mins to file off 30cm 2mm (4mm thick) or cut a slit that long instead.
theory: toughened glass is stronger because as the hot glass cools it absorbs energy molecular tightening? so if you approach that same 300c tempering heat anywhere it triggers an avalanche shattering every piece.
to avoid it, ensure you keep it cool, unstressed and only apply minimal power at higher frequency than its resonant frequency (ting it with your finger to hear that " frequency ", you should avoid applying anything making similar noise, so slower hand filing or higher frequency dremmel i figured)
if your glass gets hot enough to boil spray coolant its about to explode, or already did so be warned
possibly coolant spray beats being underwater or very wet, if immersion is propagating sonic waves worse ??
not for kids, obviously.
in spite of the scary "crack crack" noise you heard rattled me when i cooled it in the video (guess i should have cooled earlier) it did not shatter and its "ding" note (resonant frequency) was unchanged, so its now installed in my window over the double glazing as a removable privacy glass, i promise( jun 22' ) i will edit or remove this video if it ever becomes dangerous.

[@waynoswaynos]

I have been successful before doing plunge cuts with a 30mm version of these small cutters. But unsuccessful on first attempt with one of those course green diamond blades. Its messy to experiment with larger sheets! But since I got the sheet so cheaply I shall try again. Big risk, big reward.. maybe.

[@bjtena]

Men, i used the same method on normal glass, and always think it will work on tempered but never tried. I only suggest to lay the glass sheet on a carpet, so it will have less vibrations.

[@steve20118]

Thanks so much!

[@savvysu8225]

Well in India we used metal cutting abrasive thin blade with small water running through while cutting and letting wheel do it's job and not pushing it hard , it does fairly well, a Clean and nice cut, i think you should give a try, but note that you should lay glass on a carpet for good support less vibration....try it thanks me later... please post a video of your job, and hope you will atleast give credit of success for my ideas ❤

[@KirkLazurus]

What is this type of cutting called in the local market? Desi mistri ki bhasha me kya bolte hai isko? Need some toughened glass cut to fit a frame.

[@user-qq3vk1rn2d]

Bullshit. You cannot cut toughened glass unless you anneal it.

[@user-qq3vk1rn2d]

Rule of thumb! You can grind 1/3 of the thickness , using carborundum and water . Been in ghe trade 42 years and never seen anyone cut toughened glass.

[@allangee9815]

So true, cannot be cut, easier to take it back and grind it down on a polishing machine, all care but no responsibility taken if it blows up.
Show us the label from the glass supplier stating it has been toughened, and or the etched safety stamp in the corner.

[@ryanborder189]

Hi Nick
I need to cut a glass splash back-just a straight line and pretty much in half-can i do this and of so any advice?

[@MrCreator78]

Hi, if you tried that, I'm pretty sure it didn't work (glass was shattered if it was a tempered glass). Main principle is that you can remove some glass from tempered glass' edge but it should be around the thickness of the glass at maximum.

[@ryanborder189]

@@MrCreator78 it blew up!

[@robertneely5148]

Please can you tell me what the spray you used is?

[@ryanborder189]

@@robertneely5148 It smashed!😆

[@robertneely5148]

@@ryanborder189 What a shame. I want to cut some shower doors looks like I’m not going to be able to.

[@morrisjvan]

That is not tempered glass.