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A step to prevent cracking at handle-joins on thrown mugs

Drying cracks are opportunistic, especially in highly plastic or fine particled clays. They like to initiate inside sharp acute angles. The sharper the angle the greater the chance of crack. By doing this procedure before the clay gets too stiff (in the leather hard stage) you will deny a crack a place to start. Of course even drying is still important, the water content of a handle should now be allowed to get to far ahead of that of the main body of the mug at any time. In the pictures on the right, two tools are being used to compress and round the angle at which the handle meets the wall of the mug.

A step to prevent cracking at handle-joins on thrown mugs

Related Pictures

It dry shrinks much more yet cracks less. How is that possible?

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A dry cracked pottery mug

Two mugs have dried. The local terra cotta native clay on the left shrinks 7.5% on drying, the porcelain one on the right only 6% (it is made using Kentucky ball clay). Yet few pieces of the terra cotta are ever lost due to drying cracks, even if it is uneven! For example, in a batch of a dozen mugs none of these will be lost whereas one or two of the white ones will always crack. Why? Dry strength. The clay on the left is very strong in the dry state, likely double or triple the white clay (the strength is a by product of its high plasticity and particle size distribution profile). That strength is enough to more than counter the extra shrinkage.

One way to avoid drying cracks on handle-joins of engobed mugs

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The foot ring on these leather-hard mugs has already been trimmed. At the stiff-leather-hard stage an engobe was applied to the inside. This rewets the bodies of the mugs, almost to the same point as freshly-thrown. But the handles did not get rewetted. To re-dry these mugs to the point of being able to turn them over will take 4-6 more hours. But by that time the handles will be too dry. To prevent that I waxed them after trimming (leaving a just the inside handle-curves bare). That slows their drying down enough to keep them even with the body of the mug. Keeping all parts of a piece at the same water content throughout the process, that is a key to successful drying.

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Glossary Drying Crack
During drying clays and porcelains shrink as they become rigid. When this occurs unevenly, cracks are the result.

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