thi is called Wedging, its a dull tedious and labour intensive undertaking.
if the clay is too wet, you have to knead the clay onto an absorbant surface to work out the excess water. This project builds a table for this purpose. a wood fram surrounding a 3 inch thick hard plaster top. with a convient clay storage shelf under neath.
Step 1: Building the top frames
you need three of these.
Step 3: Setting in the wire to support the plaster top
once you are ready to pour tho plaster, put a roll of clay allong the top edge of the top of the table and flip it onto a flat peice of clear plastic.
Step 6: Materials List
you will also need a screwgun or a screwdriver,
a saw to cut the wood, either a hand saw or a circular saw, I use a japaneese carpentry saw to cut the 4x4's
total cost of materials was under $35
See my Kick wheel project featured on the front page:
How to make a Fish Candy Pot
Moose Makes A Pig