Rebuilding 100lb Glass Blowing Furnace

[@MicLash-mf2gn]

Question for you John, the crown of your furnace is it only fiber frax? How energy efficient is that as if you used k 23 fire brick then backed it with fiber frax. As my next question what is your bill roughly to run that furnace using natural gas. Thank you

[@Time_Traveling_Corgi]

What design changes would you make now that you have had this furnace for 2 years?

[@kevincronin60181]

So this design heats the crucible from the bottom / sides, not from above? I've seen a few videos and they all blow the heat downward towards the crucible. Liking your design better and assuming way more efficient.

[@Gibbonsglass]

Not sure how efficient but my design uses more refractory so it costs more to build.

[@greg5145]

Heating a furnace from above is for more generalized heat dispersal. From the sides is for a more specified heating location, such as putting goblets you are working on directly on the flame. Heating from the back wouldn’t make sense because the heat is being pushed directly out the opening in front. Might work for heat up while the door is shut for hours tho which is what it looks like in this case.

[@СергейСергей-ю3г2х]

Tell me please, What material is this crucible made of 0:21 ?

[@Gibbonsglass]

Not sure, 90 percent alumina

[@СергейСергей-ю3г2х]

@@Gibbonsglass Thanks !!! I want to build such a furnace. Do you have a diagram, a drawing of such a furnace ?

[@caroc4327]

Been watching the series Blown Away and I was wondering what was inside the main glass furnace. Thanks!

[@Gibbonsglass]

Thanks for watching. Yes the crucible is what holds the glass in my furnace, but I think on the show Blown Away they are using a day tank furnace which is a basin of special high temp bricks that can withstand molten glass for years.

[@robertthomas7053]

I was trying to find information on building my own furnace but find that it’s really hard to get any info. Can you offer any suggestions on why I can get more information on building furnace’s?

[@Gibbonsglass]

I used two books to come up with my designs for my self built studio. I recommend both. Glass Notes by Henry Halem and A Glass Blowers Companion by Dudly Giberson. Thanks for watching and I hope this helps! I don’t think either book shows how to build a furnace so that the crucible comes out of the front or side but that would be way easier to change the pot than lifting the top of the furnace to get the pot out.

[@Gibbonsglass]

Not sure about efficiency, but the top fired furnaces are built of less refractory and also mine is more difficult to rebuild than a type of furnace where the front comes off to replace the crucible. I hope this helps. Let me know if you have anymore questions.

[@saidsahra15]

What kind of crucible is that

[@Gibbonsglass]

I use Crucible Connection and Selee Advanced Ceramics

[@FiftymonkeysonAtree]

Yeah maybe some grilled Santa 😂

[@Gibbonsglass]

Santa's gotta stay toasty some how!

[@tangoone6312]

.

[@borisrus1]

hello! do you make a mixture of SAM or purchased? what composition and at what temperature?

[@Gibbonsglass]

Hello, what do you mean by SAM?

[@borisrus1]

@@Gibbonsglass hello! SAM, this is a translation glitch, I'm interested in the composition of the charge, thanks

[@Gibbonsglass]

@@borisrus1 I use spruce pine. Soda lime glass