Thinking Ahead
A mug isn't finished when it leaves the wheel. It still needs to be trimmed, have a handle attached, and survive daily use. Every throwing decision you make now affects those later steps.
Wall Thickness for Handles
When you attach a pulled handle later, you will score and press the handle ends into the mug body. If your walls are too thin, this pressure can collapse or distort the wall at the attachment point.
Rule of thumb: Leave your mug walls slightly thicker than you think they need to be: around 6–8mm. You can always trim away excess clay; you cannot add it back.
Leaving Material for the Foot Ring
The base of a thrown mug is typically trimmed to create a foot ring: a raised ring that the mug sits on. This foot ring:
- Lifts the base off the surface so glaze drips do not fuse to the kiln shelf.
- Creates a visually finished look on the underside.
- Allows you to clean up any glaze on the base before firing.
To have enough clay to trim a foot ring, leave the base thicker than you might for a bowl, at least 10mm. Check with a needle tool before removing from the wheel.
Drying Considerations
A mug dries unevenly because the rim dries faster than the base. To prevent warping and cracking:
- Cover the rim loosely with plastic after throwing.
- Let the base firm up at the same rate as the walls.
- Do not dry in direct sunlight or near heat.
Pro Tip
Before wiring off, use a wooden tool or your finger to gently bevel the very bottom outside edge of the mug wall. This small chamfer prevents that edge from chipping when trimmed.
Throwing Ahead Checklist
For cleaner trimming and handle attachment later:
- Leave enough base thickness for a foot ring
- Keep attachment zones unthinned
- Mark orientation if planning handle placement
Thinking ahead at throwing stage prevents later rework.
Explore More
The foot ring you will eventually trim is closely tied to the concept of vitrification, since a fully vitrified stoneware body resists moisture even where the foot is left unglazed. Understanding how different clay bodies behave at high temperatures helps you decide how thick to leave the base. The studio pottery tradition places great emphasis on these functional details that separate a good mug from a forgettable one.
