# Why the Lip Needs Attention

Unit: Conquering the Wheel
Topic: Compressing the Lip
URL: https://claybook.studio/learn/why-the-lip-needs-attention/

# The Weakest Point

The rim (or lip) of your pot is the thinnest, most exposed part of the wall. As you pull, it gets worked more than any other section. Without attention, it becomes ragged, uneven, and dangerously weak.

## What Happens to the Rim

With each pull, the rim gets squeezed, stretched, and lifted. By the time you have done three or four pulls, the top of the wall can be:

*   **Wavy**: Thick and thin spots alternate around the rim.
*   **Split**: A thin crack runs along the very top.
*   **Floppy**: The rim can no longer support itself.

None of these problems are fatal: they are all fixable in the moment with compression.

## Compressing the Lip

With the wheel at medium-low speed:

1.  Wet your fingers lightly.
2.  Pinch the rim gently between your thumb (outside) and index finger (inside), or use two fingers on either side.
3.  As the wheel rotates, move very slowly around the circumference, or stay still and let the wheel bring the rim to you.
4.  Apply light, even pressure. You are not squeezing hard, just smoothing and compressing.

## The Result

A compressed rim feels smooth, looks even, and stands up straight. It will survive drying and handling without cracking.

## When to Do It

Compress the rim after every pull, not just at the end. A rim that goes uncompressed for several pulls is much harder to rescue than one that is maintained throughout.

## Rim Maintenance Routine
Use this loop while throwing:
* Pull wall
* Compress rim
* Re-wet lightly
* Recheck rim thickness

Frequent maintenance is easier than late repair.

## Down the Rabbit Hole

Rim compression works because of [compression](https://en.wikipedia.org/wiki/Compression_%28physics%29) at the particle level, where balanced inward forces realign and densify the clay body. Many potters use a small piece of [chamois leather](https://en.wikipedia.org/wiki/Chamois_leather) instead of bare fingers to smooth the rim, taking advantage of its soft, non-abrasive surface for a cleaner finish.

## Check your understanding

### Question 1: When should you compress the rim during throwing?

- [ ] A. Only at the very end of throwing
- [x] B. After every pull
- [ ] C. Only when you see a crack
- [ ] D. Before the first pull

Tip: After every pull, not just at the end. A rim that goes uncompressed across multiple pulls becomes much harder to rescue.

### Question 2: What does compressing the rim achieve?

- [ ] A. It adds height to the walls
- [x] B. It makes the rim smooth, even, and strong
- [ ] C. It removes water from the rim
- [ ] D. It centers the pot again

Tip: Compression smooths and evens the rim, making it strong enough to survive drying and handling without cracking.