Hi. I'm a retired ceramic engineer. Use charcoal instead of wood. Form a thick layer of silica sand in the front center of the furnace. Make a depression in the center of the sand to form a bowl. Put your premixed ingredients in the depression. The pure silica sandmelts at a much higher temperature so you will end up with a pool of melt that is more fluid in the middle and will fork its own solid bowl. Draw from the fluid portion. Build the charcoal fire to each side of the pool. Good luck. I enjoy your efforts and they show just how much practice is needed to get things right.
think so too that was one of the reasons why they chopped down the forest that existed before the black forest (it got its name from the excessiv use of needle woods for its reforestation since its fast growing wood, which could be used relativly soon), they made ALOT of charcoal for smelting iron from ore.
@@firebladeentertainment5739 the Black Forest actually got its name from it being a rather dangerous place to be, the darker spruce trees came after the name
I can’t wait till you get to the point where you build your first metal lathe and mill. Then eventually you will have to design and develop machinery to make your own vacuum tubes and then transistors. By the end you will be able to make anything and everything.
@@ImCannibalOfficial true, he takes about a month for most videos but I think the biggest problem is that people got bored with his lack of progress made like when it takes a month for a video and he just makes a burger... yay can’t believe I waited a month for that... and because it’s boring he loses views making less money and he can’t do this full time
@@Hi_Brien I mean if he were actually trying to do anything with the things he’s made long term as people would have had to at the time it would have been a bad thing. It’s just a fun proof of concept though so it’s fine. Even if it the series isn’t strictly trying to stick to its rules in a way that makes sense it still feels like this channel ought to get more views for how much time, work, and money they put into it even if they do produce low quality crafts in the end.
Part of the problem with the quality of his items is that he previously hasn't been consulting craftsmen for each specialty, and in the few instances he has consulted experts, their input is largely ignored. (Or in the case where a "bow" was made, in idiot was consulted.) At the current level of tech, he should already have hardened files and carbon crucible steel for making tools to make the correct tools for all this work. Skipping steps in the tech is why all his work looks like a 6 year old made it with their feet.
You now have Cullet, a key ingredient in glass making. It will reduce the amount of energy needed as already made glass is easier to melt than new glass.
Indeed. Specially Bronze which required tin and copper, both being quite rare and heavily localized metals. Thats why civilizations have evolved differently and its just plain wrong to assume that any location in the world could have developed advanced societies.
Aww man, I still get a pang of bittersweet sadness whenever I see videos with Grant. He truly was one of the UA-cam pioneers and such a kind, humble person. 😔❤️
Try using mullite crucibles. They're intended for this use case, and are a ceramic product, so they fit with your tech tree. They work great for both metal and glass casting.
A tip for candling . If you start with hot coals and place them evenly across the bottom you can control the heat much easier. Then add fuel generally in the form of either a hardwood or or more Charcoal. When using softwoods the excess of gas some sometimes reduces the heat due to the fact that the draft is greatly higher than needed. Remember for every cubic foot of air that goes into the Kiln extra over what is needed, needs to be heated up and evacuated. Try to use hard woods such as oak and Maple as they will allow for higher BTU put per cubic foot of material.
@@TheElfsmith Adri MVP again! I had no idea making a metal pipe like that was even possible. I would’ve thought you’d need a rod or something in the middle of that to set the forge welds without collapsing the entire pipe.
frankly, seeing you getting so much better at making things just in craft is almost as good as you showing how much better we as species have become with tech. youre so much more precise and detail oriented compared to a few years ago and it really shows in your products. What youre making is really good!
I haven't watched anything yet, but I'm guessing the intro will be "We've tried to make glass multiple times. It is the holy grail of our channel! Let's see what goes wrong today!"
There’s a kiln design called “the philosophers kiln” that is very efficient when it comes to firing with wood. I don’t believe the romans used that design but it will certainly get up to 2300 degrees with proper air flow and minimal insulation, also loving the glass/ ceramic section of this series!
Put a little Bentonite clay (kitty litter) and add it to the runny borax, and it will thicken up. It doesn’t take very much either. It’s really easy to control the viscosity to your perfect consistency. Thank you for all your awesome content! Keep it coming!
1) While I'm a little disappointed that Andy isn't the one upping his skills and refining his tools as much, I'm still really happy that he's at least outsourcing the relevant work to professionals of the trade, because seriously, it takes years to master things like blacksmithing, not to mention all the tools and setup it takes to properly get going, so while it isn't *really* in the right format for The Reset in total, it's still a far cry better than before. Besides, when you think about it, it wasn't some master craftsman that did all the blacksmithing, woodcarving, brickmaking, baking, bladeshaping, etc. etc. etc. but various masters of the different crafts, though there was obviously little bits of overlap here and there, so the modern forge aside, this is way better. 2) "Bendable! Poseable! The Alien AKA the "Medium Green Man"! GLOWS in the DARK!" I was obsessed with finding a frame I could read that on, hahahaha. Made me laugh when I finally saw it. Thanks for the little bit of humour.
I don't know if Andy and the team will see this, but I thought I should write in anyway. A friend of mine in the viking reenactment community told me once that they would add ground up broken crucibles to the fresh clay when making new ones, so they would be stronger and withstand more heat. It might be worth trying out, since you seem to have a lot of spent crucibles.
Lead oxide is a better flux, especially if you want a traditional roman glass. Borax is used to make pyrex, which is a pretty modern glass, but it's maybe not great without a modern kiln. Lead is still used to make "Glass Crystal" because it allows the glass to stay liquid over a larger temperature range and trapped air bubbles to escape. For the romans, it also sweetened their wine as it turned to vinegar, so there's that.
I see this mistake often on youtube, when people are trying to heat things up like this. People make these dinky, low mass kilns. You need mass to even out the heat, to hold it in, and to buffer (slow down) changes in temperature. The only reason modern, tiny, kilns work is because they have a freaking propane blower on them. At a minimum, especially with glass, I'd have double layer brick, but I liked how he eventually added some weight. You want mass. Get some straight up KG's in there. Then there's a problem of getting hot enough. This is a challenge with primitive methods. Modern times you just add a leaf blower and stuff it full of wood, viola. To do this in a primitive fashion, I think you need to make charcoal first. You'd need a mound of it. Then you should use a timed method to reach your temperature. IE: fill the chamber with charcoal, burn half it it, time this, say 10 minutes. Then on the regular top off the firebox. Consistency is key. You'd probably wanna add a blower somewhere in there if you can. Blowers are discussed elsewhere on his channel, but for the love of god man. Make it bigger ;P
One of the problems with accieving the highest temperatures might be that you use cold wood. In glass factories in the 18th and early 19th century, the wood was first air dried for a long time in ambient temperature (months), then it was superdried and heated in a separate kiln specially for drying wood, before beeing fed into to the glass kiln while still hot (I guess the outside of the wood was allmost charcoal at a couple of hundred degrees) and the water content 0%. This way you don't waste some the glass kiln energy to heat and dry the wood before it catch fire. You also need to acciece stable temperatures... First up 14-1500°C to melt the glass, and keep it there for several hours, then slowly cool it down to about 10-1100°C working temperature suitible for glass blowing. I support the suggestions to build a kiln of larger mass to even out the temperatures. I see from 18th century glass factory archives that they spent 3 days of continiously burning wood (in an allready red hot kiln) from the crucible was refilled and a new batch of glass was heated, melted for a long enough time and then cooled to woring temperature.
Have you considered a rocket stove design for heating your kiln? It really minimizes smoke because it's more efficient. Not exactly historical technology but certainly doable with historical materials.
The black color of the glas is actually just a deep green from the iron that desolved from your crucible. Its not from the borax and you can actually tell that you had a slightly reducing athmosphere in your kiln.
Quick tip. It would have taken the Romans days to do one firing from lighting till blowing. They used a lot (tons) of wood to keep it going. They controlled the temp by how much wood per hr they used. I have no idea the numbers, since lost to history. But that's why your doing this I think.
Instead of a linear retracing of historical technology development, I think it would be WAYYYY more interesting to see a channel/video series dedicated to thinking outside the box and developing to electromagnetic power technologies from "zero" via alternative methods, even if that means they do not neccessarily look like how we know them as today.
Would you mind looking into water purification methods? Ancient ways was to just let the weak die, then came beer. But safe clean drinking water is as much a problem back then as today. Maybe even find a cost effective way for places to source water?
I heard that adding some wood ash to clay may make your pottery more resistant to thermal shock and make it more resistant to the issues you are facing at higher temps. You do need to wash the ash to try to remove the lye out of it, but if done correctly this may solve your issue.
Your ceramic pots keep exploding, likely due to them not being well constructed and dried properly. Any unevenness in the walls is going to cause stress points when your pot fires. If you put a flywheel on the bottom of your kick wheel that is wider than the wheel head you'll get much better results. Also, work on the side of the clay that's closest to you, not on the opposite side, you'll have so much more control over the clay that way. Let your finished pots dry for a few days before firing them, and have them go through two firings, you'll get much stronger ceramic pots that way. Find out what the vitrification temperature is for your clay and you'll know how hot to fire it to get the strongest clay possible. As someone else below said, use charcoal. The Romans made extensive use of charcoal in all aspects of industry. You just can't get temperatures high enough, or stable enough for proper firing.
Thanks again to Bright Cellars for sponsoring this episode! Get $45 off your first 6 bottles of wine here: bit.ly/3rbarTM
U should try coconut shells to burn to increase the temperature
Maybe try bamboo for the pipe
For the wood you can chop down a norway maple tree, Norway maples are invasive trees so you can save money and help the ecosystem at the same time
140 bucks for wood sounds steep. try craigslist for free local sources.
Will you do a canon
Hi. I'm a retired ceramic engineer. Use charcoal instead of wood. Form a thick layer of silica sand in the front center of the furnace. Make a depression in the center of the sand to form a bowl. Put your premixed ingredients in the depression. The pure silica sandmelts at a much higher temperature so you will end up with a pool of melt that is more fluid in the middle and will fork its own solid bowl. Draw from the fluid portion. Build the charcoal fire to each side of the pool. Good luck. I enjoy your efforts and they show just how much practice is needed to get things right.
So nice to hear reference of the King of Random's Grant, he will be missed
I think you ment "King" instead of "Kind."
@@benkayvfalsifier3817 Edited, cheers!
@@Hughsie28 back when king of random was good, rest in piece grant
@@bigbird4481 Callie and Nate were fine IMO, the new people they added are corny asr it turned into more of a kid channel
What happened to him
If I am not mistaken, can't you reach higher temperatures more easily and with a cleaner heat using charcoal instead of wood?
think so too
that was one of the reasons why they chopped down the forest that existed before the black forest (it got its name from the excessiv use of needle woods for its reforestation since its fast growing wood, which could be used relativly soon), they made ALOT of charcoal for smelting iron from ore.
indeed you can, primitive tech channel has videos on him making charcoal kilns
This is correct. In fact, it went wood > bituminous coal > anthracitic coal > charcoal >= coal coke, in general.
try woodgas
@@firebladeentertainment5739 the Black Forest actually got its name from it being a rather dangerous place to be, the darker spruce trees came after the name
I can’t wait till you get to the point where you build your first metal lathe and mill. Then eventually you will have to design and develop machinery to make your own vacuum tubes and then transistors. By the end you will be able to make anything and everything.
He will need to stop half assing things first.
@@ImCannibalOfficial Yup, but he's not yet at the point where half assing is all that bad :)
@@ImCannibalOfficial true, he takes about a month for most videos but I think the biggest problem is that people got bored with his lack of progress made like when it takes a month for a video and he just makes a burger... yay can’t believe I waited a month for that... and because it’s boring he loses views making less money and he can’t do this full time
@@Hi_Brien I mean if he were actually trying to do anything with the things he’s made long term as people would have had to at the time it would have been a bad thing. It’s just a fun proof of concept though so it’s fine.
Even if it the series isn’t strictly trying to stick to its rules in a way that makes sense it still feels like this channel ought to get more views for how much time, work, and money they put into it even if they do produce low quality crafts in the end.
Part of the problem with the quality of his items is that he previously hasn't been consulting craftsmen for each specialty, and in the few instances he has consulted experts, their input is largely ignored. (Or in the case where a "bow" was made, in idiot was consulted.) At the current level of tech, he should already have hardened files and carbon crucible steel for making tools to make the correct tools for all this work. Skipping steps in the tech is why all his work looks like a 6 year old made it with their feet.
They might be able to reach higher heat with better fuel, like charcoal
Exactly my thought. Would limit the smoke and soot as well
Or hard coal.
@@The_Mess85 I'm pretty sure you would want to still turn coal into coke to avoid introducing sulfur to the process (and to drive away volatiles)
Also more oxygen. If there is soot, it means he isn't burning all his fuel.
It hurt more than expected to see Grant again. I really hope his family is doing ok ❤
Damn his kids are going to grow up without their father. They were so young, I bet it was hard to explain.
I'm out of the loop on this, what happened?
@@leakingamps2050 paragliding accident like 2 years ago now
@@Falcodrin Damn, it was that long ago?
Forever may he rest in peace the man was a legend I also hope his family is able to carry on in a healthy manner
Still miss Grant :(
Me too
yep
RIP he will not be forgotten.
Ye
TKOR is not the same since he passed away 😔
Andy falling into the water and andy lighting his backyard on fire gets me every time 😂
You now have Cullet, a key ingredient in glass making. It will reduce the amount of energy needed as already made glass is easier to melt than new glass.
Man seeing grant made me shed a tear. I remember watching him in elementary school. RIP
He really didn't need to remind us. completely unnecessary to open old wounds
At first I thought it was Andy working with the clay, and that he picked a fun color of nail polish!
I'm glad to see Andy's old nemesis is back - glass!
People don’t realize how much effort it takes to make glass.
Yes indeed
Man you haven't made any bling yet. Jewelery was huge amongst our even earliest ancestors.
hmm, good point :)
Good point, Andy could make a ring of each metal to prove mastery of it
This really shows how important cooperation was back in the day.
Indeed. Specially Bronze which required tin and copper, both being quite rare and heavily localized metals. Thats why civilizations have evolved differently and its just plain wrong to assume that any location in the world could have developed advanced societies.
Cooperation is still insanely important today
Aww man, I still get a pang of bittersweet sadness whenever I see videos with Grant.
He truly was one of the UA-cam pioneers and such a kind, humble person. 😔❤️
Try using mullite crucibles. They're intended for this use case, and are a ceramic product, so they fit with your tech tree. They work great for both metal and glass casting.
A tip for candling . If you start with hot coals and place them evenly across the bottom you can control the heat much easier. Then add fuel generally in the form of either a hardwood or or more Charcoal. When using softwoods the excess of gas some sometimes reduces the heat due to the fact that the draft is greatly higher than needed. Remember for every cubic foot of air that goes into the Kiln extra over what is needed, needs to be heated up and evacuated. Try to use hard woods such as oak and Maple as they will allow for higher BTU put per cubic foot of material.
When Grant was brought up, I almost started shedding tears
R.I.P grant
Fr I used to watch him all the time
@@tempt4tions412 Me to🖐️😢
2:02 mentions Grant and King of Random but doesn't mention Cody and Cody'sLab. 😢
Still wish Grant was with us though.
Aliens are invading this video, they must love pottery work.
UFO at 5:39
I know right and not many seemed to of noticed I seen it and went straight to the comments to make sure I wasn’t seeing things
Yeah, aliens love pot.
I thought I was tripping when I saw that!
It’s still so sad that grant died😢
Who was that
Who was that
@@TheDaken73 the original host/creator of king of random. He died from a paragliding accident.
Seeing an Alec Steele anvil makes me happy
Yes I was wondering if anyone else noticed it
Frequent guest and probably my favorite guest, Adri!
Also I have no idea what's happening at 5:26 - 5:30 but I love it :D
To be completely honest, I also have no recollection of doing this.
@@TheElfsmith
Adri MVP again! I had no idea making a metal pipe like that was even possible. I would’ve thought you’d need a rod or something in the middle of that to set the forge welds without collapsing the entire pipe.
@@gavinli1368 I did, actually, it just didn't make it into the little short mashup as it wasn't very interesting.
Every episode with Adri instantly becomes twice as good
facts
im actually suprised that dude was able to turn that piece of metal into a somewhat smooth pipe
I’m literally a Jack of all trades when it comes to crafts. I actually want to learn htm everything, too!
That blacksmithing was pretty good. Hitting it hard enough to fuse but not collapse, very well done.
Man's made another failed glass video, I mean imma still watch lol
another testament to the fact that even though these technologies are black swans, they individually took lifetimes to master.
frankly, seeing you getting so much better at making things just in craft is almost as good as you showing how much better we as species have become with tech. youre so much more precise and detail oriented compared to a few years ago and it really shows in your products. What youre making is really good!
Ayyyyy it’s an Alec Steele anvil!!
6:53 Never pour liquid accelerant onto a pile of loose brush.
I've been waiting for this class, I'm excited to learn!!!!!
I haven't watched anything yet, but I'm guessing the intro will be "We've tried to make glass multiple times. It is the holy grail of our channel! Let's see what goes wrong today!"
Lol
rip grant, I miss his presence on YT :(
5:27 the walk of unmatched swagger
There’s a kiln design called “the philosophers kiln” that is very efficient when it comes to firing with wood. I don’t believe the romans used that design but it will certainly get up to 2300 degrees with proper air flow and minimal insulation, also loving the glass/ ceramic section of this series!
Don’t move on till you have success. We will keep watching, you keep trying.
5:25 so you're really just going to gloss over The Walk huh Andy?
You did it, Andy! A great achievement for you and the team. As always great video and awesome production quality. Keep up the good work!
Put a little Bentonite clay (kitty litter) and add it to the runny borax, and it will thicken up. It doesn’t take very much either. It’s really easy to control the viscosity to your perfect consistency. Thank you for all your awesome content! Keep it coming!
loved the music, editing, and structure of this video. much easier to follow than the previous ones!
Rest In Peace Grant
1) While I'm a little disappointed that Andy isn't the one upping his skills and refining his tools as much, I'm still really happy that he's at least outsourcing the relevant work to professionals of the trade, because seriously, it takes years to master things like blacksmithing, not to mention all the tools and setup it takes to properly get going, so while it isn't *really* in the right format for The Reset in total, it's still a far cry better than before. Besides, when you think about it, it wasn't some master craftsman that did all the blacksmithing, woodcarving, brickmaking, baking, bladeshaping, etc. etc. etc. but various masters of the different crafts, though there was obviously little bits of overlap here and there, so the modern forge aside, this is way better.
2) "Bendable! Poseable! The Alien AKA the "Medium Green Man"! GLOWS in the DARK!" I was obsessed with finding a frame I could read that on, hahahaha. Made me laugh when I finally saw it. Thanks for the little bit of humour.
Watching this journey is incredible, to think it took 100s of years between every invention you’ve recreated
5:39 lol caught me off guard
Rip Grant you taught me so.much in high-school you will be missed TK❤R
This is really interesting seeing you think through this whole reset
3:50 hell yeah a steele anvil!
RIP 🪦 GRANT! Fly high
I don't know if Andy and the team will see this, but I thought I should write in anyway. A friend of mine in the viking reenactment community told me once that they would add ground up broken crucibles to the fresh clay when making new ones, so they would be stronger and withstand more heat. It might be worth trying out, since you seem to have a lot of spent crucibles.
Lead oxide is a better flux, especially if you want a traditional roman glass.
Borax is used to make pyrex, which is a pretty modern glass, but it's maybe not great without a modern kiln.
Lead is still used to make "Glass Crystal" because it allows the glass to stay liquid over a larger temperature range and trapped air bubbles to escape.
For the romans, it also sweetened their wine as it turned to vinegar, so there's that.
Rest in peace, Grant
RIP grant. The true legend of UA-cam
RIP king of random 🙏🏽
Love the Steele anvil!
I see this mistake often on youtube, when people are trying to heat things up like this. People make these dinky, low mass kilns. You need mass to even out the heat, to hold it in, and to buffer (slow down) changes in temperature. The only reason modern, tiny, kilns work is because they have a freaking propane blower on them.
At a minimum, especially with glass, I'd have double layer brick, but I liked how he eventually added some weight. You want mass. Get some straight up KG's in there. Then there's a problem of getting hot enough. This is a challenge with primitive methods. Modern times you just add a leaf blower and stuff it full of wood, viola.
To do this in a primitive fashion, I think you need to make charcoal first. You'd need a mound of it. Then you should use a timed method to reach your temperature. IE: fill the chamber with charcoal, burn half it it, time this, say 10 minutes. Then on the regular top off the firebox. Consistency is key. You'd probably wanna add a blower somewhere in there if you can. Blowers are discussed elsewhere on his channel, but for the love of god man. Make it bigger ;P
RIP Grant the true king of random
One of the problems with accieving the highest temperatures might be that you use cold wood. In glass factories in the 18th and early 19th century, the wood was first air dried for a long time in ambient temperature (months), then it was superdried and heated in a separate kiln specially for drying wood, before beeing fed into to the glass kiln while still hot (I guess the outside of the wood was allmost charcoal at a couple of hundred degrees) and the water content 0%. This way you don't waste some the glass kiln energy to heat and dry the wood before it catch fire.
You also need to acciece stable temperatures... First up 14-1500°C to melt the glass, and keep it there for several hours, then slowly cool it down to about 10-1100°C working temperature suitible for glass blowing. I support the suggestions to build a kiln of larger mass to even out the temperatures.
I see from 18th century glass factory archives that they spent 3 days of continiously burning wood (in an allready red hot kiln) from the crucible was refilled and a new batch of glass was heated, melted for a long enough time and then cooled to woring temperature.
When she was throwing the clay, reminded me of ghost.
I litterally watched grant since about his tenth upload ever when I was a little kis, it was nice seeing him again.
Grants glass video is how i discovered your chanel he will be missed
The return of the elven smith
Pretty cool to see a Steele anvil!
Easily one of the most interesting channels on youtube.
I agree with many of the comments, charcoal would help with your temperature problem as would some kind of bellows to force more air in.
Nice Steele envil!!
Have you considered a rocket stove design for heating your kiln? It really minimizes smoke because it's more efficient. Not exactly historical technology but certainly doable with historical materials.
The black color of the glas is actually just a deep green from the iron that desolved from your crucible. Its not from the borax and you can actually tell that you had a slightly reducing athmosphere in your kiln.
Rest in piece to the absolute king of random
Maybe you need to add a large bellows to force more air into the combustion?
That's a very nice Alec Steele anvil that your eleven blacksmith is working on. LOL
Quick tip. It would have taken the Romans days to do one firing from lighting till blowing. They used a lot (tons) of wood to keep it going. They controlled the temp by how much wood per hr they used. I have no idea the numbers, since lost to history. But that's why your doing this I think.
An Alec Steele anvil. Class act!
I like to flex a lil.
It's also sitting on solid black walnut.
I was wondering what happened to you. Glad you are still committed to making grate videos of science!
This is a really neat channel. I always love seeing this kind of stuff.
2:03 R.I.P Grant Thompson
The black glass on the rod looks like some wicked cosplay scythe
try Roman concrete to mortar the bricks to improve heat retention
Look back a few episodes. The bricks are a modern ceramic brick adequate and appropriate for kilns since he did Roman concrete already.
This dude deserves a lot more subs and views it is such good videos and honest work 👍 Andy 😀
"sandwich" - albert einstein
He probably said something like that
I remember this
Borgir
Seeing Grant made me sad. Damn, he was such a good guy.
Let's give props to the smith who forged a metal pipe for glass blowing. It's quite difficult.
🥲 Rest in peace, Grant
Yay for more adri, they're the best, and I'm pretty convinced they actually have some kind of magic powers after watching them work.
I hope the blacksmith dude reads the comments cus I’d just like to say that’s dope and enjoy it
I'm known to peruse the comments, yes.
Instead of a linear retracing of historical technology development, I think it would be WAYYYY more interesting to see a channel/video series dedicated to thinking outside the box and developing to electromagnetic power technologies from "zero" via alternative methods, even if that means they do not neccessarily look like how we know them as today.
Good to see Grant in your footage. I miss him.
Rip Grant
2:14 you need to do more content with Cody'sLab
yea that would be cool as they have videos with the same kind of theme
I see your guy is rocking the Alex Steele anvil
Would you mind looking into water purification methods? Ancient ways was to just let the weak die, then came beer. But safe clean drinking water is as much a problem back then as today. Maybe even find a cost effective way for places to source water?
I heard that adding some wood ash to clay may make your pottery more resistant to thermal shock and make it more resistant to the issues you are facing at higher temps. You do need to wash the ash to try to remove the lye out of it, but if done correctly this may solve your issue.
You might want to look into adding big bellows on the side and use the weighted bellow lid like on the Townsends....
hell yeah worth the wait
keep on doing what you are doing andy and team
This channel is awesome! i have always wondered how they used to make things that we use every day
Your ceramic pots keep exploding, likely due to them not being well constructed and dried properly. Any unevenness in the walls is going to cause stress points when your pot fires. If you put a flywheel on the bottom of your kick wheel that is wider than the wheel head you'll get much better results. Also, work on the side of the clay that's closest to you, not on the opposite side, you'll have so much more control over the clay that way. Let your finished pots dry for a few days before firing them, and have them go through two firings, you'll get much stronger ceramic pots that way. Find out what the vitrification temperature is for your clay and you'll know how hot to fire it to get the strongest clay possible.
As someone else below said, use charcoal. The Romans made extensive use of charcoal in all aspects of industry. You just can't get temperatures high enough, or stable enough for proper firing.
That was fun to watch. And here I WS thinking “temperd glass” will be hard to make. Just any glass is hard.