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Paul Hayworth
01-25-2012, 03:26 PM
Hot Glass Spinouthttp://www.morrellglass.com/?p=201

Scott Novota
01-26-2012, 02:42 PM
Paul,


When I was in a factory in Norway I watched them do this with pieces about 20 inches across.

The only difference was that they had a torch they blasted straight down on the glass in the middle that can only be compared to how you would lower a drill on a drill press. Think of a oxy/pro torch about the size around as a coke can. I also think it spun up to a much high rpm. I saw at least 12 different cast metal "mold" deals that where all interchangeable.

I watched them crank them out at an alarming rate. I would say they would chunk about every 4th one in the cullet pile because it would spin out a little wonky. Then they would place them on about a 20 yard long conveyor belt annealer. I was told it would come out the other end in 6 hours.

They where running two spinners at the same time. The guy doing the scooping had 2 furnaces to draw from with 600lbs crucibles(moly). They did it as three man teams. The guys would do single scoops into the spinners. One guy would pick them up and put them in the annealer, and one guy would sit at the spinner and hit the button and lower the torch. Every 6 bowls they would rotate one position.

I have a pictures of the process somewhere...they also had really cool powerder boxes that you could watch the dust get sucked up into the vent as they rolled in it. All kinds of neat stuff on that trip. Now I want to find the pictures again.

They had a smaller station as well that did the same thing. It seemed to be a pretty common deal to them.

In the shop onsite they where approx 250.00 USD.(the big ones)

Marty Kremer
01-26-2012, 10:07 PM
http://www.npr.org/2012/01/26/145837380/want-to-make-a-giant-telescope-mirror-heres-how

I need that Blanchard...

Tom Fuhrman
01-27-2012, 09:30 AM
First time I saw this technique was at Reidel crystal in Austria. Dwight Morland used to do this at one of his Southwestern Glass factories. Many others have done this for a long time.

Durk Valkema
01-28-2012, 04:42 AM
Spinning glass was developed in the 50s in Europe both at the Leerdam factory where my father experimented with the idea of spinning glass in a converted laundry centrifuge, and at the Orrefors factory in Sweden by designer Sven Palqvist who was inspired by the way milk creeps up the sides in a hand cranked milk centrifuge you found on small farms to separate the cream and make butter. He obtained a patent on the production technic.
Famous is his Fuga series and it was a big commercial success.
http://images.orrefors.com/pressbilder_new.asp?lang=eng&sida=1&kat=formgivare&submenu=Sven%20Palmqvist&submenu2=
Now it is used the world over to produce cheap boring glass.
It is a great principle that should be used more innovative.
Jocelyne Prince used the centrifuges at VrijGlas in 2008 for a great spinning event: http://jocelyneprince.com/hello-world/

Henry Halem
01-28-2012, 04:19 PM
Durk- If you want to see a real creative variation on your fathers spinning technique take a look at Peisers "coil" built bowls.

Durk Valkema
01-29-2012, 03:48 AM
I know we visited Mark after the Louisville conference. He is a real genius with an amazing studio.
Anyone out there that wants to try get a grant, there is a centrifuge at the VrijGlas foundation.

Sandy Dukeshire
01-29-2012, 10:52 AM
a while back we tried something like that, but upside down. we mounded sand onto a lazy susan then trailed the glass over the sand mold. we had to spin the lazy susan by hand. it didnt work too good. a potters wheel would have worked much better. its on the list of things to play with again sometime. next time i WILL try it while dancing. if it still dosen't work at least it will be more fun.