How to Make Pottery Sinks

Decide what kind and what dimensions of sink you want to make.

Calculate your clay shrinkage and write down the wet diameter.

Weigh the needed amount of clay. Remember that sinks should be much thicker then most of the pots you have ever made. You probably will need about 6-9 kg (13.2-19.8 lb) of clay for a 30 cm (12 in) external diameter sink or 12-15kg (26.4-33 lb) for 42 cm (16 7/8 in) diameter sink. The quantity of clay depends on the sink type. Vessel sinks need to be thicker than drop-down sinks.

Make sure your clay is soft. If not, mix it with recycled softer clay or soak it in water for 24 hours before kneading.

Wedge and knead your clay thoroughly. If needed, divide your clay to smaller lumps and knead them separately. You will combine them later directly on the wheel head.

Place the clay at the wheel-head and tap it with two hand to make it centered as much as you can before wetting your hands.

Wet your hands and center the clay.

Open it and make your way deep down until you make a hole and reach wheel head surface.

Enlarge the hole but keep it slightly narrower than the final diameter.

Pull and raise the clay to make a thick bottom and thick wall and get your final dimensions and final shape.

Leave excess clay at the lower parts for support.

Smooth the interior with wood, metal, or rubber rib.

Cut with a wire.

Let your freshly thrown sink to dry slowly until it reaches leather hard stage.

Place clean bat over the rim.

Flip the sink upside down.

Trim off the excess clay.

Leave to dry slowly until leather hard.

Fix the to the wellhead.

Let dry slowly.

Slow bisque fire to cone 05 or according to your clay.

Decorate, glaze and re-fire to at least cone 6.