trimming: where heavy pots become good pots
l.08 · 6 minute read · updated July 2026 · by the studio
Pick up a mass-produced mug and a handmade one with your eyes closed and the difference you feel is trimming. A thrown pot comes off the wheel with a thick, blunt base; trimming cuts that excess away at leather hard and carves the foot ring the pot will stand on for the rest of its life. It is the difference between a pot that sits and a pot that lifts.
leather hard: the timing window
Trim when the clay is leather hard: firm enough to hold its shape upside down, soft enough to cut in clean ribbons. Press a fingernail into the base; it should mark without denting the wall. Too wet and the rim deforms under its own weight. Too dry and the tool chatters, the trimmings turn to dust, and cracks follow. In queensland heat the window can pass in an afternoon, so wrap pots in plastic to slow them down rather than racing them.
centering upside down
- Place the pot rim-down on a clean, dry wheel head.
- Spin slowly and watch the base: its circle will drift if off centre. Nudge the pot between rotations until the drift disappears. The tap-centering trick (a light tap against the high side each pass) comes with practice.
- Fix it down with three walnut-sized lugs of soft clay against the rim. Press the lugs to the wheel, not the pot.
cutting the foot
With the wheel at medium speed, brace both hands and touch the trimming tool to the spinning base. Take ribbons, not gouges. Define the outer diameter of the foot ring first, then hollow the centre inside it, leaving a ring 4 to 6 mm wide and a domed or flat floor above your known base thickness. The pot should end up weighing roughly what it looks like it weighs; that is the whole aesthetic law of trimming.
Sound is your depth gauge. As the base thins, the pitch of the cut rises; a hollow drum note means stop now. Every potter has trimmed through a base. It is a rite, and the pot becomes a lesson in how thick you actually threw it.
the unglazed truth
The foot ring usually stays unglazed (glaze would weld it to the kiln shelf), which makes it the one honest fingerprint on a finished piece: raw clay, tool marks, the maker's judgement. Turn over any piece in our catalogue and you are reading the trimming. Collectors check feet first, which is exactly what how to judge a handmade piece teaches you to do.
common questions
when is clay leather hard?
When it holds its shape but a fingernail still marks it: typically 12 to 48 hours after throwing depending on humidity. It should feel like cold chocolate, not like sponge or chalk.
why do potters trim a foot ring?
It removes excess weight, lets glaze stop cleanly above the shelf, lifts the form visually, and gives the pot a stable, finished base. It is also where a maker's hand shows most honestly.
what tools do i need for trimming?
One loop tool or japanese-style trimming tool ($10 to $20), a needle tool, and a sponge. A giffin grip is a convenience for later, not a requirement.