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I am slumping a pasta bowl and gradually getting the results I want.
But I'm at a conundrum of do I let it soak longer or crank up the heat a bit.

The details:
My bowl is 10.5" across and needs to slump 1.5" BE glass
I'm touching bottom with my current schedule but want the glass to settle into the sides more.

My current schedule is:
300° to 1050° hld 5 min
9999 to 1250° hld 50 min
9999 to 960° hld 30 min

So should I soak longer or raise my temperature?

Thanks.

Carla

the problem is the middle fell too quickly.

if you do this again, try 50 to 1250 instead of 9999 to 1250.

if it's slumped now, use more time. more temp may cause it to puddle.

Carla, are you slumping an inch and a half piece of glass, or is the bowl 1.5" deep?

Stephie wrote:Carla, are you slumping an inch and a half piece of glass, or is the bowl 1.5" deep?

I didn't make that very clear, huh? The bowl is 1/5" deep, the glass is just the regular 2 layers thick.

Thanks.

Carla

CM Fox wrote:

Stephie wrote:Carla, are you slumping an inch and a half piece of glass, or is the bowl 1.5" deep?

I didn't make that very clear, huh? The bowl is 1/5" deep, the glass is just the regular 2 layers thick.

Thanks.

Carla

My fingers are all confused today. The bowl is 1.5" deep. Ack.

Thank goodness!
I'd agree with Charlie, slow down

charlie wrote:the problem is the middle fell too quickly.

if you do this again, try 50 to 1250 instead of 9999 to 1250.

if it's slumped now, use more time. more temp may cause it to puddle.

I'm with Charlie. The books say to slump fast (AFAP) from 1000 to 1300, but I think this is a silly schedule. The best results for me have come from dropping my ramp rate to 100 dph at 1000 and taking two hours to get to 1200. This works for a larger span of over 12", but for smaller pieces you may have to go slower, longer or hotter.

Try Charlie's schedule and I bet you'll get great results, but watch the piece when you bend it and see when it's done. That way you will learn the appropriate schedule for that particular mold.

I did it using Charlie's suggestion of ramping up 50° an hour to 1250°. It worked like a charm. Thanks so much!

This board is the bestest!

Carla

congrats. pictures?

i find that the wider the platter, the faster it falls at a lower temp. frequently, if i start at 1150 and go to 1225 at 50/hr on anything larger than about 10" wide, it's slumped all the way before i get to the top temp. the trick is finding the diameter and top temp ratio so that i top out at at the end of the slump time just as it's settling down to the bottom of the mold.

Okay...here's a photo of the successful slump if I have correctly figured out how to add the picture. The glass is just clear, no purdy colors, as I just wanted to get my slump schedule right.

Carla

http://community.webshots.com/scripts/e ... ity=kJzGDR

Try 2 at showing a photo.

http://community.webshots.com/album/124888643UcRuom

It worked. You're on your way. Brock

3rd try at posting a photo. Thanks Charlie & Brad for your help. Thanks to all others for your patience, with goobered tries.

Carla