Quick Answer
Coils for optimal strength should be 3-5% of the vessel's diameter in thickness. This thickness allows for a balance between structural integrity and flexibility. A coil that is too thin may not provide enough strength, while one that is too thick may be prone to cracking.
Coil Thickness Calculation
When working with coils, it’s essential to calculate the ideal thickness based on the vessel’s diameter. To do this, multiply the vessel’s diameter by 0.03 (3%) or 0.05 (5%). For example, a vessel with a diameter of 20 cm would require coils that are 0.6 cm (3%) or 1 cm (5%) thick. This calculation ensures that the coils provide sufficient strength without compromising flexibility.
Pit Firing and Coil Integrity
In pit firing, the coils must withstand the intense heat and thermal shock. To achieve this, it’s crucial to use a consistent and precise coil thickness. A coil that is too thick may crack or shatter under the heat, while one that is too thin may not provide enough support. To mitigate this risk, use a combination of coarse and fine clays, which will help to create a stronger and more durable coil.
Waterproofing and Coil Thickness
When creating waterproof vessels, a thicker coil is generally preferred. This is because a thicker coil provides additional strength and resistance to water pressure. However, it’s essential to balance this with the risk of cracking. To achieve this balance, use a combination of clay types and techniques, such as applying a layer of slip or applying a mixture of clay and water to the coil’s surface. This will help to create a strong and waterproof vessel.
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