Dissolving Through Tempered Glass Attempt Two: from one side only
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- Опубліковано 31 гру 2024
- I try again but dont flip it around part way through.
First video: • Can I Dissolve Through...
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I like how he just cuts to the shattered glass, without any silly tension building and procrastinating.
He just follows up with even more interesting stuff.
No BS, too content
Of course, he wasn't filming the whole week
@@cleitonfelipe2092 LOL. They think he omitted the shattering for brevity reasons. Derp.
He's already shattered glass like that a few times already leading up to this one
The best kind of youtuber
I just realized that one of the things I love about this channel is that the end result is not a foregone conclusion. We'll see success or failure and I think that's worth a lot.
Yess please dissolve a Prince Rupert
This!
The Mad Atheist I 300th it
Dissolve the tail off!!
But please don’t literally dissolve him
inb4 high-speed acid-covered glass explosion
I recently learned in a visit to the Corning glass museum that molten glass is a universal solvent - many glassblowers will only work in their own studio because they know how the atmosphere of their studio will interact with the chemical composition of their glass. It may be interesting to look into this property of glass with some experimentation! :)
I've heard that specialized kinds of glass are made in platinum crucibles for just that reason
@@mordoc333 molten glass is one of the few liquids that can dissolve gold - that's how you get that beautiful red glass that's super expensive
Matthew Garber the gold is mixed in as a salt and forms nano particles it is not actually dissolved.
@@theCodyReeder Au2O3.
I've been wondering for a long time what glass couldn't dissolve cuz I've dissolved a lot of things into it that makes a lot of sense
Hey cody, I have been able to slice a slotted hole in tempered glass with a high speed pneumatic cut off wheel using a 1/4 thick grinding wheel. I put a fair amount of force into it, while spinning it up as fast as it could go. it "melted" a slot into the glass. 100% sure it was tempered.
Essentially annealing as you go
Hope Cody sees this comment
Exactly
Great experiment! Some people would say why bother, but I really enjoy these videos.
Thanks, Cody; informative and educational, as always. It's appreciated. 👍
One serious warning is needed, however: Be extremely cautious with HF. It's evil stuff. I worked with it years ago, where it was used for etching semiconductor wafers, and one woman in the factory, who happens to be a neighbour, had a slight leak in the little finger of a protective glove. The tiny quantity of HF which seeped through contacted her skin and produced mild burning. First aid was administered, and she carried on working, without much discomfort. A few years later, she had the finger amputated because it had developed bone cancer. There is also a documented and verified case where a lab assistant spilled a few drops of HF onto their body, and died of heart failure a very short time afterwards, despite having washed off the spillage.
Isn't this like saying if i cut an elastic band under tension really slowly it won't fling off. As soon as the pressure is released its gonna just go.
Not quite. Tempered glass has compressive forces countering the tension forces inside. It's perfectly possible to have a piece of tempered glass with a hole in it. If the glass is tempered with that hole in place, then the strain patterns in the crystal will form around the hole instead of through it.
Removing sections of a pane of glass without breaking it is kind of like playing Jenga. There are pieces under net zero stress that can be safely removed, and some that are under some stress that, when removed, can safely offload their stress onto other pieces. However, if the balance between compression and tension isn't preserved locally to where the piece is removed, you get what basically amounts to "leverage" pushing and pulling far stronger on other parts of the glass.
It might be possible to predict a place to put a hole through the glass if the strain profile was analyzed. You can see it with two images of the glass, scanned through some polarizing film. (Two images so you have horizontal and vertical polarization. Overlaying the two would give you total strain) You'd want to look for areas that show the least polarization at any angle, since any polarization indicates high internal stresses at that position.
The trick is to sneak up on it...
What if you hold the elastic, then someone can cut and you can slowly release the elastic bands without the sudden fling, doesn't applies to glass though
If you bore a hole in the tempered glass while annealing it you should be able to because your technically pushing a hole through the softened glass
Have you determined that this is even theoretically possible? That is, if you can figure out what the pressure gradient for that glass looks like, and then you put a perfectly round cylindrical hole in that glass (using math, not chemistry or a drill), is the glass expected to not crack? Because I'm starting to wonder if it's not just "trauma" or "imperfection" that's making it shatter, but just the loss of force equilibrium from that hole existing at all.
My thoughts exactly. I can't imagine how this could possibly work without some advanced methods for mapping out the internal stress pattern of the specific piece of glass and finding the perfect position, shape and size for the hole. And even then it still sounds like trying to dissolve a hole in a pressurized balloon.
But I love the fact that he's trying anyway, i'd love a surprise result!
@@Dusto9 I don't think a cylindrical hole could work, but it might be possible to e.g. mask off a 25.0mm circle, etch it down a tiny bit, then mask off a 24.0mm circle, etch down a little further, then a 23.1mm circle, then 22.3mm, 21.6mm, 21.0mm, 20.5mm, etc. so that the glass right at the edge of the 24.0mm circle would have glass supporting it from below as well as the perimeter, and likewise for each circle going inward.
It's impossible due to what tempered glass is. You can't drill it, cut it, or dissolve it. The energy from the heat that it's baked in is trapped inside the glass when it is slowly cooled. Once you break the 'tension' the energy releases and that's why it breaks into pieces roughly as wide as the pane is thick. On a poorly manufactured piece of tempered glass you can shoot a bullet or even pellet through it and it won't shatter completely but instead into shards. I worked in a glass shop for years, I have never seen any way of altering the shape of a piece of tempered glass ever. EVER. and I have been to many many trade shows with the latest greatest technology
@Evi1M4chine I thought the pressure inside is lower, not higher. The glass is still very hot on the inside when the outside cools. As the inside finally cools as well, the molecules would really like to huddle closer together (contracting while cooling), but the rigid outer shell prevents them from doing so. Prince Rupert's drops, made in a similar fashion, often have cavitation bubbles inside, further evidence that the pressure inside is relatively low.
@Evi1M4chine However, it is possible to put a hole in a baloon without it popping. Just stick some tape on it! Maybe there's something simmular but with glass?
These types of videos are my favorites from you Cody. Don't get me wrong, I also like reforesting the ranch, but these experiments are what drew me to your channel and still draw me to it.
It's nice to watch before bed, I find, and I don't mean that because I think it's boring. I like that you don't speak in the high-energy youtube tone that everyone tends to use. I find it grating and hard to wind down to when I watch people who speak like that.
I like that you talk like a normal person to the audience.
The only thing I can't say I watch is chicken hole base, and I also don't mean that in a rude way, it's just not for me.
I love how you always make these followups when we don't understand everything in the first video.
I remember thinking the same: Why didn't he try it from only one side.
So instead of letting us think it might have worked you just tried it. And you even mixed in some interesting side notes (the borosilicate glass thing)
Thanks Cody!
Thank you for promoting Team Trees Cody. And thank you for being a great UA-cam creator.
Cody, thank you for doing much stuff for team trees, i know you care for that stuff with your own reforestation etc.
and happy new years!
was about to do the same. Keep this comment up in stead guys!
This was great! It answers a bunch of questions I have had for years. I used to use HF to clean the insides of antique seltzer bottles, and heard every myth in the book for working with this deadly substance. Thanks.
I never really thought about it, I didn't even realize it was possible to dissolve through glass
You, Sir, have good taste in UA-cam videos.
You should keep in mind that not all glass is the same. Like Cody said, test tubes are pretty good at resisting nearly everything, whereas the glass you're drinking from would indeed be affected. When you start to look it up you will find all kinds of different glass, depending on what it will be used for. Different materials can be used, but (in the case of tempered glass) different treatments also affect it.
Strong bases like sodium or potassium hydroxide can also dissolve through glass. Very slowly if you use them as an aqueous solution, but fairly quickly if you use molten NaOH/KOH. (You just make the corresponding silicate.)
Hydrofluoric acid is a beautiful solvent for, due to fluorine’s affinity to bond strongly with silicon. That’s why people always use plastic equipment when HF is used in laboratories
This guy is on like all the vids I watch
Cody you should try decreasing the surface area of the acid every day (reducing the size of the container on the glass) to promote formation of a more conical hole which might have a better chance of withstanding the internal forces of the glass
I don't think any of this will work. Tempered glass is under pressure similar to how a Prince Rupert's Drop works. Once you get through the exterior layer and get into that core, there's too much expanding force and it causes it to shatter. These experiments about attempting to dissolve through the glass are more wishful thinking than anything and sadly won't work. It only hurts the wallet to try in this case.
Merry post-solstice
@@GrimmsDeath that's my concern, too. That it might not matter _how_ you get the hole in there, and that the glass just can't handle the stress of that hole's very existence.
To make *a hole* in (already) heat tempered glass, there's really only one option - anneal it, cut hole, temper again.
Certain _chemically_ tempered glass types, through ion exchange, can be laser cut. But AFAIK you can't even do _that_ with _heat tempered_ glass.
It all comes down to the inner/"center" mass of the glass, under immense pressure, wanting to physically expand - but being prohibited by the rapid-cooled outer layers, now having contracted more than the inner/center layer, from doing so. Once you pierce or weaken enough the outer, differentially contracted layer - the inner layer expands rapidly. Bang, bazillion pieces.
@@pr0xZen That does sound about right. As soon as that outer layer can't take the pressure, the panel WILL break.
Happy holidays Cody, keep posting great video
having worked with tempered glass for many years in the past, back in the days of glass lenses in spectacles i’ve successfully recut and ground lenses if i reheat the lens to remove tempering but bringing a a sheet of glass up to temp would need an industrial sized unit to bring the glass up to just under 1200 degrees fahrenheit then let cool evenly and slowly so as not too setup stresses within. nice try though really enjoy you videos Cody. thanks all the best for the new year
Cody, you most likely won't see this, it's an old video. I only found you a month ago(1-13-21 now), if that, yet I've seen nearly half of your videos already!
I love chemistry! And I enjoy the way you take on chemistry and other sciences on your channel. I have watched a lot of nilered and others, but I don't find their channels near as good as yours.
In high school I skipped over general sciences and started 9th grade in honors chemistry. 10th was college chemistry. However I moved after 10th and the new school district (different state) refused to allow me to continue in honors, or even advanced classes, or continue into more advanced college classes (we came into the district a week before school started and the administration refused any transcripts we brought). I kind of gave up on high school at that point, took chemistry in college and before I finished my second year I ended up in the military with nuclear.
Then started working at a civilian power plant before becoming fully disabled.
I really wish I could do these experiments you are doing, it looks like so much fun. But due to money issues from beginning disabled in just left with watching them on UA-cam.
So I wanted to thank you for the hours of amazing entertainment.
One of the best at edutainment. May your holiday be pleasant, and look forward to 2020✌️
Dissolving the tail off a Prince Rupert's drop would be awesome, especially if you could catch it with a high-speed camera (Maybe with a sound-activated trigger).
How is this comment older than the video?
@@daemon10101 patreon members get early access.
@@daemon10101 Patreon magic, and the time machine Cody built 10 years from now.
Wouldn’t the sound be heard after all the action has already happened tho?
Wouldn't the drop break faster than the speed of sound?
The glass molecules are under incredible tension, this is why the entire piece will shatter every time.
My eyes started burning just watching this video
Happy Holidays, Cody!!!
Maybe if you try a donut shape instead of a large round area. (or see if it etches further if you use a larger or smaller area)
Won't work. The strength in tempered glass (like prince rupert drops) is in the outermost layer. Defeat that, it breaks.
How would the donut shape help? How would the smaller area help?
@@adamborg1 If the inner layer at the etched part pulls and what would be the outer layer would counteract that pull, then removing less area of the outer layer might sort of scale the forces. I'm just saying it might work but on second thought i realize it doesn't work that way.
Trying to dissolve a hole in tempered glass is a really cool idea. It's an interesting demonstration to show that even that doesn't work.
Cody, Thanks for supporting the trees!
Cody, incase you were looking for a stupidly dangerous (but interesting) chemistry project, I wonder if you could make fluorine gas from mouthwash or toothpaste. Since they contain fluoride ions, it should be possible.
This would be something interesting.
Though Idk if it would be of any use considering toothpaste has 0.00xx% of fluoride compounds. Maybe welding sticks with lithium or calcium fluoride insulation would be more useful in this case.
It would be a lot easier to start with the acid which I already have... lol
He is allergic to mint I think so he doesn’t have mouthwash or tooth past
i tried that
dad work in a pharmacy and i got like 30 box of 50 tube of expired colgate xD
and i extracted the sodium fluoride from it
i got like 20 gram
im not so stupid and i dont have glass ware to make hydrofluoric acid xD
it was the main reason tho
Almost more of a NileRed project!
Io Saturnalia, Cody! I think tempered glass is strong the same way a Prince Rupert's drop is strong: in one direction (outwards) but as soon as its damaged from the other way, the structure essentially unzips. The only way to etch through tempered glass would be to anneal it first, do whatever work you need to, and then re-temper it.
I think a prince Rupert's drop is tempered glass, but then again, they are made by cooling in water extremely fast, And I think there are some minor differences in tempering glass like the stuff Cody has, so I don't know
The mechanism that causes the glass to crack is stress and all methods that remove supporting material in the center will inevitably cause the structure to collapse regardless of how you remove it. It's simple physics, man. This is unless you can come up with a method that reinforces the structure itself. Failing that, it doesn't matter how gently you remove material since, at the end of the day, supporting material will still be missing.
I don’t understand how tempered glass can have holes if they are made pre-temper but not post. The “supporting material” analogy is apt but seems to break down in these cases.
Merry X-mas Cody!
Can you dissolve any part at all? Like the corners or the edges.
What if you dissolved both sides simultaneously? The glass propped at 90 degrees to the surface and use something like a 90 degree plumbing bend glued on to hold the acid.
Also, you try dissolving various different sizes of hole. Perhaps smaller holes cause less disruption or very large holes completely dissolve around the internal stresses and causes less destruction to the structure.
Happy new year!
This reminds me of when I used to work on pinball machines. One time I was putting back on a glass (clear playfield glass) that was old and scratched and...boom! I was left there hands still holding glass bent over stunned. I think I bumped a corner of it.
Hey Cody, I have an idea for a follow up experiment. If we assume the tension is what breaks the glass, then it might be similar to a balloon when it pops. The interesting thing about balloons is that you can poke a hole in one while inflated if you put adhesive around the hole you are poking, to provide some rigidity, preventing the forces from tearing it apart through brittle fracture. Please try adhering the glass around the area where you dissolve it partially, and then continue dissolving and see if that would make this work.
Dude love your content, congratulations
My favourite crazy science guy here on youtube
Ex glass blower here.
1. Tempered glass is constantly fighting with it self. The inside has tension while the outside is compressing(I think I'm remembering that correctly). As you mentioned its shattering once it gets to the center because the tension from the inside becomes to great. I don't see this working no matter how you do it but I'm hoping you prove me wrong.
2. The comment from Felix in the video, Dehardening isnt a word used in glass. Annealing doesn't make glass harder, it takes the stress out from the forming of the glass. The way Tempered glass is made, it will never be fixed by annealing, its already annealed.
Ah, XMas and a new upload by Cody. Thank you so much.
I think it deals with compromising the overall surface tension. Its equal through the entire glass panel. Once a single area loses its sporting role (strength), it shatters. Which means no matter what method you use, it will shatter because its the same outcome of loss of strenth just with a different method.
@Cody'sLab In my experience of making Prince Rupert's drop I simply dripped molten glass into a bucket of water. I found that, at least from my experience, the hotter the glass was when I dripped it at a foot or two above the bucket into the room temperature water the more likely it was to make a drop. I theorize that the greater the temperature difference the quicker the outer layer is able to form a solid so that it is able to do the compression. The height I think is required for the drop to become fully immersed quick enough that the drop is able to form. When I dripped it from to close it formed less often. At least this is what I recall. Its been a few years since I made them.
*@Cody'sLab*
Can you re-heat-treat the glass with a blowtorch or something? (not heat the whole glass, instead use a big heat-gradient from the "hole point")
By fist reducing / remove the middle stresses & THEN dissolve through it?
(or melt your way through it with the torch (but that's probably a VERY BAD idea, in-case it doesn't work & the "cracking / explosion" flings molten glass around) )
Unevenly heating glass tends to shatter it, and soda lime (aka soft) glass does not do well with thermal shock.
@@cobalt1754 What if the glass is first pre-heated to just below being liquid (or below when it starts to reduce the internal stresses), and then "spot heated" as described above?
That might make the temperature difference small enough to work?
@@sebbes333 than it is no longer temp erred glas but it is annealed glass and loses its strenght
@@sebbes333 At about 1000 degrees F, the glass will anneal and lose its temper. It is no where near melting, in fact it won't even bend at that temperature, needs to be about 1150F to bend in my kiln. Then you would anneal it, reduce it to room temp, drill the hole, polish the edges of the hole to make sure there are no microfractures and then send it through the tempering kiln.
Really glad I saw his first video, it explains tempered glass well
What about making a glass sandwich, with the tempered glass in the middle (the meat) and non-tempered glass with a pre-drilled hole on top and bottom (the bread)? If you adhere the whole construct together the upper and lower sheets may help prevent the tempered sheet from shattering
Prevent from exploding everywhere, maybe, it would still shatter
I like this experiment, stress in the glass seems to be the culprit.
It would be nice to be able to get a Polariscope arrangement to take time lapse pictures of the stress changing in the material.
and play the glass some relaxing music
Thank you for contributing to the TeamTrees movement 💚 Best youtuber
Tempered glass is supported by the outer layer to maintain pressure equilibrium.
Any holes and cuts have to be done before tempering.
Ignoring temperature or stress as a significant factor, I'm fairly certain that once a significant pit is formed the acid can start etching outward into the edge of the glass parallel to the pane rather than the direction you want it to go in.
Good video as always Cody.
The main support is the caps and when it melts through it weakens the support . Maybe try holding the glass with an independent structure away from the etching point. Also over a larger surface are to reduce force
Seems like it's more or less equivalent to trying to cut through a super powerful spring that's held under an extreme amount of preload. You can cut through it fast with a cutoff wheel, or slow with a hacksaw or a tiny file, but no matter how fast or how slow you do it, the moment it hits a certain point, the material will catastrophically fail and all of the tension is going to release all at once. In the case of a piece of tempered glass, there's no easy way to remove the preload.
This is a cool Xmas gift thanks cody
always look forward to your posts!
Does melting the glass work? Or maybe using acid to thin it out then melting the rest
You'd still probably need to heat the entire thing so it doesn't explode.
its *tempred* glass
i dont think that may work
Koukou Zee you can cut prices of tempered glass with lasers. All that is doing is burning it.
hit the glass with hammer! viola!
@@mohinderkaur6671 violin!
Cody, have you considered trying to dissolve through tempered glass using a saturated solution of potassium hydroxide?
As you reach the centre, the potassium should be able to substitute smaller sodium ions in the glass, thus relieving the tensile stress before dissolving it.
This is the basis of a process called "chemical tempering", where molten potassium salts are used to induce compressive stresses in the outer surface of a sodium-rich glass.
it might be possible if you dissolve a small layer neutralize then repeat. it might be that there are micro fissure in the glass allowing for the acid to travel.
Can you preload the tempered glass by clamping a pair of washers around the dissolving site? After the hole is cut, you can put a bolt through to hold the washers and release the clamps. Key thing is to keep the glass in compression the whole time.
What would happen if you dissolved the glass vertically (putting the acid on the thin side). Would it crack quickly or would it go for a similar percent of length as doing it when the glass is laying flat?
It will be the same result. 2mm will be dissolved until core is reached and then crack!
From the edge. This could be interesting.
Have you tried using polarized light to observe the stress in the glass?
It might be interesting to compare the partially dissolved shards to other shards, as well as intact glass.
Merry Xmas Cody
0:13 reminded me oddly of the band Stone Sour’s song Through the Glass
Edit: fun fact, that band’s lead singer happens to be Corey Taylor, the lead singer for the band slipknot.
Hey cody will you ever do more precious metal videos? I've watched them all about 20 times now haha by far my favorite.
It could be done in a pressure chamber, when you can measure the tension in the glass it should be possible to calculate the outer pressure to overcome the inner tension. but as soon as you relaese the pressure it will shatter.
Try placing more and more Epoxy onto the glass as you slowly dissolve it. Your Issue is similar to that of a balloon exploding when hit with a pin, a problem which can be mitigated via something as simple as a piece of tape to ensure you contain the rupture. With any luck the Epoxy will accomplish a similar goal absorbing the stresses and redistributing them evenly as you dissolve through. Right now it seems like your best shot since as you are fully aware of the structure of Tempered glass with always prevent you from doing this unless you contain that initial rupture.
Happy Holidays Cody:-)
merry glassmass from cody
Hey, Cody. I think your facing few more problems apart from just stress diference between sides of glass. Another possible reason it fails is stress concentrators. Basically any sharp edge naturally acts as one, resulting high local stress and failure. Also bubles, and micro cracks that glass contains by itself might be a problem too.
I'm wondering if maybe slight temperature changes are what is causing it to explode. If you have compromised the structure of the glass by dissolving deep enough wouldn't that allow a larger fluctuation in temperature in the middle because the temperature has less glass it needs to change the temp of.
PLEASE DO NOT GIVE UP! I know you will come up with something... Try a smaller hole... Start dissolving a bigger hole then go decreasing the size of the hole, like a conic shape hole. Use smaller glass frames.
if the force in the glass is pushing out . find a way to push the glass in on all 6 side maintaining the balance . pressure tank maybe ?
It's how sharp the drop off is. Make it a more wide parabala. Start with a bigger pool for the first mm, then go smaller, then smaller, then smaller.
take two metalic rings, that are about the size of the hole you want to make, adhere them onto either side with something like JB well prior, then do the dissolving after that is cured.
The reason the glass breaks is because it is under Massive pressure, as when glass cools it doesn't cool uniformly. (prince Rupert drops)
This should allow those stresses to be put into the metal rings, and hold the glass together, much better.
Have you perfected the Prince Rupert drops yet? I love rewatching your videos!
Thanks for the video. Tempered glass has about 10,000 psi of internal pressure. If you were to clamp the glass with enough pressure you could get the glass to hold together, until you remove the clamps. Interestingly if the glass you had was perfect this experiment would work since glass has a theoretical strength of 17k psi therefore holding together against the ~10k psi temper stresses would be no problem. Typical glass strength is 1k psi.
Cody! All you are doing by dissolving hf into the glass is introducing stress concentrations. The entire piece of glass is under tension because of the tempering process. When you introduce stress concentrations the glass will crack because you exceed the yield point of the glass. Basic strength of materials stuff I learned in college for mechanical engineering.
So what's your solution?
You're not introducing new stress, just unbalancing the existing stress, similar to popping a balloon.
@@hibraisil exactly, it's concentrating the stress around the area he is dissolving.
@@anirudhnavin4568 there is no solution unless you de temper the glass lol
Yeah the only solution ibsee would be to cut a hole in the glass before tempering...
Don't let Cody's callous description of HF's toxicity convince you that it's not very dangerous. It's an *extremely* toxic acid.
I think you need to redirect the forces around the hole before dissolving the hole. Silicone won't cut it. Maybe some sort of cement, or perhaps even by stretching the glass so it is in tension.
And by adding some sort of tension to the glass? Like using clamps in the horizontal and vertical axis?
I may have a weird potential solution to doing this. I weld frequently and every so often a piece of glass is nearby and will end up with small spatters embedded in it. I have embedded embers into safety glass several times without it shattering. Not sure about all the science that takes place that keeps it intact but it is a observation I frequently get yelled at for. ''Look what you did!'' Then I promptly shatter it , got to replace it anyway so why not?
Add potassium fluoride, if it is soluble... that way the potassium ions can add additional pressure, preventing it from cracking? Similar to how gorilla glass works?
That glass busted like my ass after I’ve eaten an entire can of beans while watching Cars 2
Oddly specific
Have you considered that perhaps the weight of the glass resting on the bottle cap it's contributing to the breakage on the weakened glass?
I've tried all sorts of ways to cut hole or dissolve a hole threw tempered glass .I've never been able to do it that's why I was so interested in your video . But I don't feel bad anymore as you educated people can't Esther lmao .keep up the great videos
What did you use in the intro, silver nitrate?
I agree with wanting to do experiments with volatile chemicals in winter.
Good year mr. Reeder
7:33 Collab with SmarterEveryDay when?
Yes! I believe he made a video in prince Rupert drop
you videos make me feel big brain
Taping the edge of the glass will keep the glass together and possibly save the top and bottom layers
I don't have much to add except to say that I liked the video, but I've heard comments help the algorithm.
Anyone know where the opening guitar riff is from?
Does that reaction produce heat? If so that maybe be stressing the glass in that point. ! Also along those lines could you find a temperature to heat the glass to(in that spot) where it would expand enough to not be under stress and thus allow you to cut through?
I had the same problem with the prince rupert's drop, when I was using borosilicate glass to make it. It worked after switching to regular glass.
Maybe you should try it with a glass ceramic, the residual stress should be much lower.
I wonder if you applied vertical clamping force In a circular shape and poured acid in the center, would you be able to delay the shattering till after the hole is made?
Because of internal stress of the glass if you heated the spot and cooled it before trying to dissolve it you can change the temper of the glass giving you greater odds of success
The middle of the temper is the weakest due to not being completely heated as hot as the top/bottom. so this blows my mind. I didnt expect this outcome as an Operator at a glass plant in tipton.
Could clamping around the site give it the tension it’s losing so that it doesn’t shatter?
Maybe dissolve the tempered glass literally from the side of the glass. Like the edge. See if that works
haha lol. Thinking outside the box.
Wouldn't that defeat the purpose?
It will be the same result. 2mm will be dissolved until core is reached and then crack!
@@yaroslavpanych2067 Actually the side part is often unhardened even up to 20mm from the edge, or so I've heard. So you could probably successfully drill through that area.
@@PuerRidcully You can look through two lenses of polarized filters to see the stress in tempered glass.
What if you try to etch a concentric staircase shape. You can etch for a while without breaking then try to etch a smaller diameter inside the larger etched zone and so on. Eventually, maybe you get a hole. However, it is tricky to determine the taper.
Glass wants to break from the stress it under, from the moment we cool it it wants to break. So if you're going to do this, I bet heating it several times to relief the new stresses introduced as you're dissolving it, the hard part when to relieve the stress. I think you have the answer already about 1 mm in on both sides relieve the stress I'm sure your oven is big enough to fit that glass in. Also temp and time. I worked at a glass plant for years if the cooling was off just a bit we would get a crack all the way up to the furnace 100 yards, other times we would get the glass inspected and cut then pick it up and it would explode not break explode this wasnt tempered glass either 60 x 96 sheets of glass. So relief of the stress is important.