What centring actually is
A centred mound of clay is one whose mass is distributed symmetrically around the axis of rotation. When it is centred, the clay does not move sideways as the wheel turns — it sits still under your hands. Everything else in throwing depends on this.
Beginners usually attack centring as a problem of force. It is not. If you push hard at a wobble, you move the whole mass and create a different wobble. Centring is the art of applying pressure so the clay redistributes itself toward the centre, using the wheel to do the work.
Mark the clay with a needle across the top as it spins. If the mark stays put, you are centred. If it drifts or the mound rises and falls, keep working.
Prepare the clay before it touches the wheel
Centring starts at the wedging board. A body with uneven moisture will fight you for the whole session. Wedge it properly, shape it into a cone or a dome, and slap it down onto a freshly wetted wheel head — off-centre is fine, because that is what centring fixes.
- Wedge the clay until the moisture feels even through the whole mass.
- Form it into a rounded dome, not a cube. Corners wobble.
- Wet the wheel head, then press the clay down hard enough that it grips.
- Use the heel of the hand, not the palm, to seat it.
The three motions
Coning up
With both hands around the base, press inward and lift. The clay rises into a tall cone. This is not decoration — coning up and back down aligns the particles and does most of the centring work.
Pressing down
Flatten the cone back into a dome with both hands, pressing down and slightly out. The clay spirals into a symmetric mound.
Final press
With the wheel at moderate speed, press the heel of one hand into the side of the mound while the other braces the far side. Hold steady until the mound stops moving.
Common errors and what they mean
| Symptom | Likely cause | Fix |
|---|---|---|
| Mound keeps wobbling | Not enough lubrication, or hands not braced | More water, brace forearms on the wheel pan |
| Clay climbs over your hand | Pressing too high on the cone | Work lower, at the base, and reduce speed |
| Top tilts to one side | Uneven pressure between hands | Press with the heel, keep both hands symmetrical |
| Centre achieved, then lost | Moving on too fast | Hold the final press for several full rotations |
| Hands slide off | Too much water | Dry hands slightly, use less water and more pressure |
It is easier to centre at high speed because the wobble is harder to see. Learn at the slowest speed you can manage. Slow centring builds the skill; fast centring hides the problem.
A practice drill that works
Take 2 kg of clay and centre it. Then cut it off the wheel with a wire, wedge it, and centre it again. Do this ten times in a session without ever opening the clay into a form. It is boring and it works better than anything else.
- Session 1–3: centre 2 kg ten times. Do not throw anything.
- Session 4–6: centre, then open and raise a cylinder to 10 cm.
- Session 7+: throw a full form, then return to centring drills whenever the skill slips.
If a session feels repetitive and uneventful, you are almost certainly improving. The dramatic sessions — where everything goes wrong — teach less.
Ceramic work involves respirable crystalline silica, kiln temperatures up to 1300 °C and glaze materials that can be toxic in powder form. This guide is an educational reference — it is not a substitute for the instructions supplied with your equipment. Always ventilate, wear appropriate respiratory protection when handling dry materials, and read our studio safety guide.
