Dales Funky Glass wrote:Hello everybody,
I am new to the forum, looks like there is a lot of great information & people here.
I am slumping a piece that is 9 mm thick, size is about 7x11 inches, the middle contains a pot melt (6mm thick) that I cut up. There is a border 1.5" wide around the melt with a 3 mm layer of opague red on top of Bullseye tetka clear, and then there is a layer of Tetka clear over the whole thing.
My original schedule in a Paragon 24 was:
275 to 1225, 40 min
500 to 1440, 10
Full to 900, 60
100 to 700, 0
full to 85, off
You certainly had me confused for a bit - combining metric and Fahrenheit!
I found this schedule for a 12mm piece:
150 to 1150, 5min
600 to 1250 10 min
full to 900 3 1/2 hrs
40 to 800,0
80 to 700, 0
full to 85, off
Overly long soak at annealing point (in my oppinion).
My suggestion would be to treat this piece as at least 12mm, possibly 15mm.
At 12mm - initial heat at 140C to slump temperature, no intermideiate soaks, no fast rises. Afap to annealing temp - for Bullseye I would use 482C and then use the Bullseye soak for thick pieces which is 2hrs then 55/hr to 427 and 99 to 370C , finally 330/hr to 21C
At 15mm - initial heat at 90C/hr to slumping temp. Bullseye schedule suggests 3hr soak, 25 to 427, 45 to 270, 150 to 21C.
Bullseye recommendations on annealing here: http://www.bullseyeglass.com/pdf/other_ ... _slabs.pdf
Any recomendations on this schedule/different one & where I could speed up the process? How much could I cut back the annealing at 900 degrees and speed up the fall between 900 to 700?
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