Warping
Question: What are the known causes for warping?
Answer: In general, some of the known causes for warping are:
improper wedging
uneven moisture content
mishandling the clay during the wet work
over working the clay while throwing
uneven drying
speed drying
uneven firing
speed firing
using uneven or warped shelves for wet work, drying and firing
Click on Kenny Kicklighter's document to see examples and detailed 'how to' instructions: Warping.pdf