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What is a pugmill?
A pugmill (also written "pug mill") is a machine that mixes, conditions and extrudes clay into a smooth, consistent, ready-to-use state. In a pottery studio its main jobs are to reclaim and recycle clay scraps, blend different clays into a custom body, and push out de-aired clay that is ready to throw or hand-build — all without the hard physical work of wedging by hand. The same mixing principle is used at industrial scale in brickmaking, cement and construction, but for potters a pugmill is simply the fastest, kindest way to keep good clay in circulation.
Below we explain how a pugmill works, what it is used for, how it compares to wedging, the difference between standard and de-airing models, and how to decide whether you need one. You can browse our full pugmill range and clay extruders at any point.
What is a pugmill, in brief?
| Aspect | Details |
|---|---|
| Function | Mixes materials into a homogeneous mass, extrudes clay to a plastic state, and recycles/reclaims clay so it can be used again. |
| Applications | Pottery and ceramics studios; also brickmaking, cement and construction mixing. |
| Benefits | Reuses clay scraps, avoids hand wedging (protecting wrists), and lets potters blend their own custom clay bodies. |
| Design | A barrel containing one or more rotating shafts fitted with pitched paddles or augers that knead, fold and drive the clay towards an extrusion nozzle. |
How does a pugmill work?
Clay scraps, trimmings and slurry are fed into the pugmill's hopper. Inside the barrel, rotating augers or pitched paddles knead and fold the clay, working out lumps and evening out the moisture content until the mass is uniform. The auger then drives the conditioned clay towards the nozzle and extrudes it as a continuous, plastic "pug" that is ready to wedge briefly or use straight away. Because the action is continuous, you can keep feeding scraps in one end and collecting usable clay from the other.
What is a pugmill used for?
Pugmills are best known in the pottery studio, but the same mixing technology is used across several industries:
- Pottery and ceramics: recycling clay, blending custom bodies and preparing a consistent, throwable clay — the day-to-day backbone of a busy studio.
- Brickmaking: mixing and conditioning clay before it is shaped, so the finished bricks are dense and uniform.
- Cement and construction: thoroughly combining raw materials in the early stages of production and mixing components for stable, even results.
- Environmental projects: stabilising or encapsulating materials where a homogeneous mix is required.
Pugmill vs wedging: why potters make the switch
Traditionally, clay is prepared by hand wedging — a repetitive kneading action that removes air and evens out the clay. It works, but it is hard on the wrists and shoulders and slow when you are reclaiming large volumes. A pugmill does the heavy mixing for you, which is why studios, schools and production potters value them so highly:
- Reusing clay scraps: dry offcuts and trimmings go back into circulation instead of the bin — cost-effective and far less wasteful.
- Kinder on the body: taking the strain out of wedging helps protect wrists and lets potters work longer, more comfortably.
- Custom clay bodies: blend different clays, or adjust moisture, to get exactly the consistency your work needs.
A pugmill greatly reduces hand wedging, though many potters still give pugged clay a quick final wedge before throwing — particularly with a standard (non-de-airing) machine.
De-airing vs standard pugmills
The biggest choice when buying is whether to go for a standard or a de-airing pugmill:
- Standard pugmills mix and extrude clay but do not remove trapped air, so the clay usually needs a short hand wedge before throwing. Models such as the Gladstone G49E 50mm Pugmill, G50E 50mm Pugmill and G52 75mm Pugmill suit smaller studios and clubs.
- De-airing pugmills pull a vacuum inside the barrel to remove air pockets, so the extruded clay is dense and throw-ready with little or no further wedging. Examples we stock include the Gladstone G48 70mm de-airing pugmill and the larger G54 100mm de-airing pugmill.
If you reclaim a lot of clay and want it ready to throw straight from the machine, a de-airing model earns its place; if you mainly want to recycle scraps and don't mind a quick wedge, a standard pugmill is a more economical choice.
Choosing a pugmill: types and models
Pugmills come in horizontal and vertical layouts and in a range of barrel sizes. The right one depends on the volume you process and the space you have:
- G49E 50mm Pugmill — compact, ideal for smaller studios and reclaim duties.
- G50E 50mm Pugmill — a step up for steady studio use.
- G52 75mm Pugmill and G52P Power Feed Pugmill — larger barrel and power feed for higher throughput.
- G53 Vertical Pugmill and G55 Vertical Pugmill — vertical designs that save floor space.
Browse the full pugmill collection to compare sizes, or see our clay extruders if you mainly want to shape clay rather than reclaim it.
Do you need a pugmill?
A pugmill is most worthwhile if you produce enough clay waste to reclaim regularly, run a teaching studio or club, or simply want to protect your wrists from heavy wedging. Hobby potters working with small amounts of clay can often manage with hand wedging alone. If you're not yet ready to invest in your own machine, many community studios provide one — our UK pottery classes & studios directory helps you find local options across every UK county.