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  #51  
Old 07-29-2019, 06:44 PM
Michael Ahlefeldt-Laurvig Michael Ahlefeldt-Laurvig is offline
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Actually Greg I wish you would not waste my time on links like that
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  #52  
Old 07-30-2019, 06:27 AM
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Point well taken. I have asked that if you do provide links that you explain what they are involved in. A number of years ago, we had someone putting up links that led to porn sites, an issue if you opened the link at your workplace. Also, not so much in the general discussion board. Cords, seeds... OK
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  #53  
Old 07-30-2019, 01:48 PM
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Got ya. Sorry. Got carried away.

Was moving really far away from original post anyway.

I'll save my bs for more appropriate social media platforms.
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  #54  
Old 07-30-2019, 02:13 PM
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but we love lime train wrecks....
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  #55  
Old 07-30-2019, 04:31 PM
Lawrence Duckworth Lawrence Duckworth is offline
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Half the time I don’t know what you guys are talking about but I read it anyway. I googled Pilkington, float glass, bed of tin?......
What kind of hell would this be full of glass 😳
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  #56  
Old 07-31-2019, 09:46 AM
Shawn Everette Shawn Everette is offline
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It's a sight to behold, several football field non stop process. They've got lasers too!
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  #57  
Old 07-31-2019, 11:47 AM
Lawrence Duckworth Lawrence Duckworth is offline
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Hard to imagine, looking into my 200elbee furnace at batch temp is hard enough

....so who’s the Richard Serra of Glass……gotta be somebody out there making really big stuff
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  #58  
Old 07-31-2019, 12:53 PM
Shawn Everette Shawn Everette is offline
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The process is actually temperature stepped, so it's only really bad at the beginning of the continuous melt. The tin bed is one of the more interesting parts.
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  #59  
Old 07-31-2019, 01:03 PM
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Quote:
Originally Posted by Lawrence Duckworth View Post
What kind of hell would this be full of glass 😳
Here's a pic of a melting chamber.
10014677_10202753871520606_1739149831_n.jpg

They wouldn't allow photography on the tour I was on. There are small viewing ports around the tank(s). The one they let us look into was the same chamber type in Lawrence's pic. It was really surreal. I first thought it was empty because the glass was so clear. An Olympic-size swimming pool full of molten glass.
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  #60  
Old 07-31-2019, 04:04 PM
Charles Friedman Charles Friedman is offline
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I had a chance to visit Spectrum glass many years ago and I remember walking (quickly) across a bridge that span the wide ribbon of glass that was being pulled from the furnace and dragged over a bed of melted tin, then into a 100 foot long Lear. This way you could get from one side of the shop to the other without having to go the long way around. We bought large cardboard barrels of broken sheets to melt and blow.
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Last edited by Charles Friedman; 07-31-2019 at 04:09 PM.
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  #61  
Old 07-31-2019, 05:29 PM
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And I remember Norman courtney dropping a cane drawing over that catwalk into the roller. Hilarity ensued and we were banished.
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  #62  
Old 08-01-2019, 07:54 AM
Shawn Everette Shawn Everette is offline
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So it does have a tin side? That would be fine for the stained glass they were selling, but should screw up the fused.
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  #63  
Old 08-01-2019, 09:40 AM
Tom Fuhrman Tom Fuhrman is offline
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when I went thru the Spectrum factory, it was a totally different procedure than you folks mention when they were producing the stained/fused glass sheets. They had not hot bed of tin for the production I saw. It was a little more traditional like Kokomo and Wissmach but the mixing of colors was done in a fore hearth not on a table as others had done in the past.
The Pilkington float plant I visited was extremely automated. There were not that many people involved except in the control room and running the fork lifts to move the pallets of glass after they were automatically cut and stacked and crated.
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  #64  
Old 08-01-2019, 10:52 AM
Steven O'Day Steven O'Day is offline
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From the old Spectrum site knowledge base:

The float process is used to produce virtually all common window glass today, thus the term "float glass." Not used for art glass production.
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  #65  
Old 08-01-2019, 10:56 AM
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Can we get back on topic, or shall I start a new thread about Bomma and Kugler cullet?
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  #66  
Old 08-01-2019, 12:44 PM
Shawn Everette Shawn Everette is offline
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That's what I was thinking. Realistically a perfect surface isn't even a traditional aesthetic for stained glass, and since you're remelting fusable so it's not really relevant there either.
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  #67  
Old 08-01-2019, 01:08 PM
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Quote:
Originally Posted by Mark Rosenbaum View Post
Can we get back on topic, or shall I start a new thread about Bomma and Kugler cullet?
*****
Have at it. Eric brought some Bomma up to the shop last night and will, I suspect, fuse some to my clear which sits on SP87. He may report in. I don't know what computer he brought up. I'm headed to San Diego right now and will see the results in a week.
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  #68  
Old 08-02-2019, 01:31 AM
Jordan Kube Jordan Kube is offline
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Man, these threads get so pedantic. I made the trident seals that we measured in class. Bomma was spot on with Spruce.
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  #69  
Old 08-02-2019, 08:00 AM
Art Freas Art Freas is offline
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Quote:
Originally Posted by Shawn Everette View Post
That's what I was thinking. Realistically a perfect surface isn't even a traditional aesthetic for stained glass, and since you're remelting fusable so it's not really relevant there either.
The perfect surface makes a difference when cutting the glass for fusing. It was way easier to get a good cut in spectrum than is was in bullseye.
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  #70  
Old 08-02-2019, 09:17 AM
Shawn Everette Shawn Everette is offline
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Oh, for sure, but I would call neither of their surfaces perfect. A mirror finish hasn't been the standard, and changing the manufacturing process would significantly add to the cost.
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  #71  
Old 08-02-2019, 03:37 PM
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Quote:
Originally Posted by Jordan Kube View Post
Man, these threads get so pedantic. I made the trident seals that we measured in class. Bomma was spot on with Spruce.
****
Call it what you will but whenever I do expansion tests, I want three sources aiming at the same thing. Hagy, ring and dilatometer. Pull tests are nice too. Confirm tests with a strainoptics polarimieter. When John does an expansion seal, I do as well and if they are on the mark, it's good. It's not all that hard to get outlier results when doing this stuff. Poor annealing can lead you astray easily.

I do think it's nice as well as being a novelty that someone would make cullet that actually conforms to a 96 standard, the elephant in the room. I don't see anyone else doing that.
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  #72  
Old 08-05-2019, 10:17 PM
neil duman neil duman is offline
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So, has anybody actually used the Bomma enough to give a critique of it.
We are getting ready to order cullet and would Love it if some crazy glassblower out there can give it an honest revue based on actually using the stuff.
Any info is appreciated.
Thanks
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  #73  
Old 08-06-2019, 08:25 AM
Shawn Everette Shawn Everette is offline
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I can probably make a cup from picking up the cullet, but it's gonna be months before it's in the furnace.
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  #74  
Old 08-06-2019, 01:53 PM
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Eric ran the tests on the Bomma while I was in california doing both Hagy seals as well as taking a lump of it and melting it into sandwich shape using my clear cullet. Do recall that my clear was engineered to absolutely sit on SP87 ( a 96) so that if Tom hit availability issues with lithium that a replacement clear was ready to go.

We threw it in the polarimeter this afternoon and it's absolutely dead on the match. It showed no strain whatsoever in any of the readings.

So I can infer from that test that it is likely a very nice blowing glass. I can't speak to luster or durability yet. That will require running pots of it which I'm not going to do. I would feel very confident ordering this cullet over any of the others in the field.

Good job Charlie.
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  #75  
Old 08-07-2019, 10:45 AM
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I posted on Facebook ("Glassies" group) about Bomma and John C responded:

'I did a trident seal test with some Bomma samples Tom Littleton had while I was at Penland school recently and it showed absolutely zero strain with SP87 under the polarimeter. So perfectly close I think it might be the same glass'

So there are many sources of good feedback for Bomma. I'm interested if anyone's gathered Bomma over cane or a blank made with Spectrum 2.0 since I have a shit ton of cane, murrine and blanks made with Spectrum 2.0. All signs are pointing to reasonable fit, but it's glass--you never know, especially with two clears. I get the feeling I'll end up being the guinea pig.
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