jamesp
Cave Dweller 
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 5, 2018 6:23:54 GMT -5
This supposed to fail, large 18 pound brick. 9" x 12" X 2". Good size for slabbing on rock saw. Opaque glass tricky to brick cast. Got faith in this import that it won't crack after cool. Made a stainless brick mold out of buffet serving tray. 24 hour cook, 1 to 2 days to cool. Target is bubble lift pattern 'Psycho'.    On a 21 inch shelf  |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 5, 2018 22:36:45 GMT -5
Long time cooling. No cracks !! Glass community a bit freaked by my big bricks lol. Grow some guys, let's go nuclear. A timid bunch, not mad scientist experimenter types. Will saw tomorrow. Fingers crossed for 'Psycho' pattern. 12x9x1.5 inches.  Had to cut the stainless mold off. Will put a latch on it for removal next time.  |
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Post by rockpickerforever on Jul 5, 2018 23:56:47 GMT -5
That is one heckuva mad glassers casserole, James. Hope your psycho pattern shines forth! I know you are not into buying new items, when you can scrounge up used, but you need to keep your eyes open for a Springform baking pan. I think it would be just the ticket.  Springform Pan Bakeware Rectangle Nonstick Removable Bottom Black (14" x 9.3" x 3") Leak proof. This one on Amazon link. Only question is, can it withstand the temp of your kiln? You ain't baking brownies in there... |
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Post by fernwood on Jul 6, 2018 3:41:35 GMT -5
Great idea on the springform. Shouldn't be too hard to find a high temp latch to attach to a regular pan either.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 6:45:24 GMT -5
rockpickerforever fernwoodI posted this stainless form on glass fusing. They said wake up and buy $2 fireplace bricks and make dams(molds) out of them. They are fast and easy to arrange. Hold heat longer to prevent fast-cool-cracks typical of glass bricks. Oh, and perfect square edges. Got em, $1.80 ea and are 9"x4"x2.5", great mold size for the big casts I am doing. My biggest brick, stone cold strong judging by saw cutting right up to the last bit before breaking away. Nary a crack but anticipated increase in bubbles due to 1 3/4" thickness, but not so many. Can hold slump longer. Block holding on by a shoestring = tough glass  Looks great "Maggots" 
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Post by fernwood on Jul 6, 2018 7:25:09 GMT -5
Your maggots would go great with the mass of maggots rock Jean posted in the "What do you see in a Stone" thread.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 8:24:15 GMT -5
Your maggots would go great with the mass of maggots rock Jean posted in the "What do you see in a Stone" thread. Jean is famous for 'images and shapes seen in rocks' Beth. The girl has some imagination. |
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Post by fernwood on Jul 6, 2018 8:45:36 GMT -5
Hey, do not leave out Ali, John and myself. Know there are many more here who see what is hidden in a rock. Why not post some of your glass in the thread? John was amazed that there had been no posts for a while.
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Post by Rockoonz on Jul 6, 2018 8:57:28 GMT -5
Too lazy to search your thread to see if it was already mentioned, but I saw your stuff on the flintknappers group on FB.
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Post by hummingbirdstones on Jul 6, 2018 8:58:24 GMT -5
That is one huge honkin' glass brick. Need a bigger maggot picture so I can see the pattern better. Looks very cool. Way to go, jamesp! You are knocking it out of the park. |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 9:33:30 GMT -5
Too lazy to search your thread to see if it was already mentioned, but I saw your stuff on the flintknappers group on FB. Yep, I am working on them Lee. I am trading blanks for a spearhead. And a nice long list. If they all say it is good material for knapping then I hope to sell them slabs. I sent to 4 knapper's yesterday. Hope to send to another 4 next week. Hope to get back 4 fine glass spearheads per week. I love those guys work uh art. |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 9:35:39 GMT -5
Hey, do not leave out Ali, John and myself. Know there are many more here who see what is hidden in a rock. Why not post some of your glass in the thread? John was amazed that there had been no posts for a while. Been many a creative rock image posts on RTH over the years. Jean famous. One time she had sex images lol. most rock folks see things in rocks. Must be out nature. |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 9:44:04 GMT -5
That is one huge honkin' glass brick. Need a bigger maggot picture so I can see the pattern better. Looks very cool. Way to go, jamesp! You are knocking it out of the park. The small photo to test if anyone was looking. that brick went like clock work. Many of the glass fusers seemed totally intimidated by such. Man I read procedures for doing big brick, said to do crazy stuff like full heat(1500F) and anneal for days at a time. That brick out of the kiln in less than 24 hours, seems solid9as a brick). I will continue to max out my kiln to the largest brick I can fit in it.. It makes $$$ sense to get the most out of each firing. "Maggots", it was supposed to be "Psycho". I doubled the thickness and that must have prevented the Psycho pattern. Probably because the thinner brick heated up quicker and the bubbles carried the more liquified glass up thru the others causing more disturbance. :    |
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 9:48:14 GMT -5
Got to go tune up my 2nd trailer and prep it for picking up monster load of glass next week.
Hope the deal doesn't fall thru.
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Post by hummingbirdstones on Jul 6, 2018 10:28:28 GMT -5
Thanks for the bigger pics! I tried enlarging on my screen, but still too small for these old eyes. Need to go see a damn eye doctor.
Good luck on your new haul. Don't see any reason for it to fall through. They want it gone and you want it.  |
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Jul 6, 2018 10:42:25 GMT -5
Wow
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NRG
fully equipped rock polisher
Member since February 2018
Posts: 1,688
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Post by NRG on Jul 6, 2018 11:00:08 GMT -5
Why are air bubbles in glass under pressure?
Intuition informs the opposite.
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Post by MsAli on Jul 6, 2018 11:00:17 GMT -5
That is one huge honkin' glass brick. Need a bigger maggot picture so I can see the pattern better. Looks very cool. Way to go, jamesp ! You are knocking it out of the park. The small photo to test if anyone was looking. that brick went like clock work. Many of the glass fusers seemed totally intimidated by such. Man I read procedures for doing big brick, said to do crazy stuff like full heat(1500F) and anneal for days at a time. That brick out of the kiln in less than 24 hours, seems solid9as a brick). I will continue to max out my kiln to the largest brick I can fit in it.. It makes $$$ sense to get the most out of each firing. "Maggots", it was supposed to be "Psycho". I doubled the thickness and that must have prevented the Psycho pattern. Probably because the thinner brick heated up quicker and the bubbles carried the more liquified glass up thru the others causing more disturbance. : Those are turning out fantastic How long will it take to get some out to the knappers and get your return product? |
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Post by fernwood on Jul 6, 2018 11:12:40 GMT -5
I do not care what you call them, but those slabs are cool. Can see where they would appeal to many.
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jamesp
Cave Dweller
Member since October 2012
Posts: 36,612
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Post by jamesp on Jul 6, 2018 11:35:48 GMT -5
Why are air bubbles in glass under pressure? Intuition informs the opposite. Thanks Well Scott, is it called the ideal gas law ? pressure = temp/volume ? somehow it may be involved. Or gas is being generated chemically at a lower temp reaction during cooling. rest assured those bubbles must be have several 100 psi. release that to a sealed rubber rotary vessel and all hell must break loose. I get ya, cooling should reduce pressure. That part is simple. |
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