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#1
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cracked bottoms
Hi All,
Does anyone know why the bottoms of some of my bowls get S cracks on them? I make them all the same but maybe one out of ten will get that crack. I compress the inside bottom while throwing and when trimming the bottom. It seems to happen after they are all finished while they are drying. I wrap them until they are hard enough to trim. Am I supposed to wrap them again after trimming? Is there any way to fix it? Sandi |
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#2
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After wedging, I look at the part of the clay I'm going to smack down on the
bat and if there is any evidence of wedging, grooves, folds etc, I wet my finger and smooth it off first. Seems to help for me. Tony http://tonyolsen.com/up/ "sandi" wrote in message et... Hi All, Does anyone know why the bottoms of some of my bowls get S cracks on them? I make them all the same but maybe one out of ten will get that crack. I compress the inside bottom while throwing and when trimming the bottom. It seems to happen after they are all finished while they are drying. I wrap them until they are hard enough to trim. Am I supposed to wrap them again after trimming? Is there any way to fix it? Sandi |
#3
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i think there may be something in the centering that leaves S cracks. some
pots - the ones where i may slack off fully centering and dive into the lifting too soon - seem to have S cracks more then pots where i take full time to center. steve Subject: cracked bottoms From: "sandi" Date: 8/26/2003 1:47 PM Pacific Daylight Time Message-id: Hi All, Does anyone know why the bottoms of some of my bowls get S cracks on them? I make them all the same but maybe one out of ten will get that crack. I compress the inside bottom while throwing and when trimming the bottom. It seems to happen after they are all finished while they are drying. I wrap them until they are hard enough to trim. Am I supposed to wrap them again after trimming? Is there any way to fix it? Sandi steve graber |
#4
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In my experience it's usually down to "downforce" during opening. if you
are making a medium platter (about 12"+ across) lean on the base hard as you throw, and keep on doing it ( i sometimes use a rib for this, but mostly the flat of my hand + then the edge (good source of fine callouses(calli?)), then when it's done make sure that the base dries out at the same speed (even slightly faster) than the sides (with big platters use a bit of asbestolux to put the pot on so the base don't sag inwards, and then change it every 12 hours). It's a lot of work but it means that S cracks are only an occasional pain........... Can also be that you didn't wedge it properly, or centre it, but that usually shows up during the throwing..... Love Eddie "Slgraber" wrote in message ... i think there may be something in the centering that leaves S cracks. some pots - the ones where i may slack off fully centering and dive into the lifting too soon - seem to have S cracks more then pots where i take full time to center. steve Subject: cracked bottoms From: "sandi" Date: 8/26/2003 1:47 PM Pacific Daylight Time Message-id: Hi All, Does anyone know why the bottoms of some of my bowls get S cracks on them? I make them all the same but maybe one out of ten will get that crack. I compress the inside bottom while throwing and when trimming the bottom. It seems to happen after they are all finished while they are drying. I wrap them until they are hard enough to trim. Am I supposed to wrap them again after trimming? Is there any way to fix it? Sandi steve graber |
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