slumping a sink

art4ul · Post by **art4ul** » Sun Feb 15, 2004 2:28 pm

Okay, I'm trying to slump an oval sink. Nothing too big. It measures 13" x 9.5" x 5" and 3/8" thick. First, time I fired to 1250 got a good slump going but not quite to the shape of the mold I was firing it into. Second time around I fired to 1350 and the glass ended up in a puddle on the bottom of the mold. Do I need to fire to 1250 and just soak the kiln longer or should I fire to 1300 and just watch the kiln like a hawk?

Marty · Post by **Marty** » Sun Feb 15, 2004 6:48 pm

Go slow, real slow to 1000 and soak. Then take it to 1200-1250 and watch it. 20 to 30 minutes should do it.
Was the puddle interesting?

art4ul · Post by **art4ul** » Mon Feb 16, 2004 8:59 pm

Hey Marty,

Thanks for the reply. No, the puddle was ordinary. How slow is SLOW? Are we talking 200dph or slower?

Marty · Post by **Marty** » Mon Feb 16, 2004 10:30 pm

Slower- you've got a fair-size chunk of glass to slump, you don't want to risk thermal shock on the way up (or down for that matter).
I've recently had to mend my evil ways and slow down to less than 100dph on the way to 1000.

Jackie Beckman · Post by **Jackie Beckman** » Tue Feb 17, 2004 1:56 am

Marty wrote:Slower- you've got a fair-size chunk of glass to slump, you don't want to risk thermal shock on the way up (or down for that matter).
I've recently had to mend my evil ways and slow down to less than 100dph on the way to 1000.

Hey Marty, what about on the way down? Did you ever slow the cooling side of your schedule? By the way - your new work is fantastic! You were supposed to post here when you updated your site with those pictures, remember? Oh, and since I'm bitching anyway, you've had a PM in your box for a month. I was never planning to delete it because I just wanted to see how long it would take you to find, but it's driving me bananas! Just check that darn thing sometimes. And why can't you ever take out the garbage . . . oh! sorry!

Dani · Post by **Dani** » Tue Feb 17, 2004 2:59 am

Jackie Beckman wrote:
Marty wrote:Slower- you've got a fair-size chunk of glass to slump, you don't want to risk thermal shock on the way up (or down for that matter).
I've recently had to mend my evil ways and slow down to less than 100dph on the way to 1000.
Hey Marty, what about on the way down? Did you ever slow the cooling side of your schedule? By the way - your new work is fantastic! You were supposed to post here when you updated your site with those pictures, remember? Oh, and since I'm bitching anyway, you've had a PM in your box for a month. I was never planning to delete it because I just wanted to see how long it would take you to find, but it's driving me bananas! Just check that darn thing sometimes. And why can't you ever take out the garbage . . . oh! sorry!

Gads. These are great... go take a peek:

http://www.kremerglass.com/newdir.htm

Did you make the mold for Ellipsis?

Marty · Post by **Marty** » Tue Feb 17, 2004 9:02 am

Jackie Beckman wrote:
Marty wrote:Slower- you've got a fair-size chunk of glass to slump, you don't want to risk thermal shock on the way up (or down for that matter).
I've recently had to mend my evil ways and slow down to less than 100dph on the way to 1000.
Hey Marty, what about on the way down? Did you ever slow the cooling side of your schedule? By the way - your new work is fantastic! You were supposed to post here when you updated your site with those pictures, remember? Oh, and since I'm bitching anyway, you've had a PM in your box for a month. I was never planning to delete it because I just wanted to see how long it would take you to find, but it's driving me bananas! Just check that darn thing sometimes. And why can't you ever take out the garbage . . . oh! sorry!

nag, nag, nag!
I do take out the garbage. And cook, and.... remember, I'm the mom here.
I got the messages- how could one get a pm from another BMD owner and not look?

and yes the way down is sloooooow too. Usually a total of 20 to 28 hours annealing and cooling to rt.

Dani- that mold is a secret (for now), a prime instance of cheatin' technology!

art4ul · Post by **art4ul** » Tue Feb 17, 2004 12:19 pm

WOW!
Love your work Marty. I promise to go slow. This is the third attempt at slumping the sink, hoping that the 3rd time is the charm. By the way, how thick are your pieces?

art4ul · Post by **art4ul** » Sun Feb 22, 2004 3:43 pm

Okay, did the third try with a bit more success, but not completely happy. Fused the three sheets of glass together first for 3/8" thickness-great! Made the mold for slumping into-also great. Took it real slooow to 1250. Okay. Let it soak for 25 minutes, lip starts to curl in. I'm not sure if I'm going to use this or not. I might just cut the lip off. Should I be slumping over the mold instead of into the mold? Any more advice?