# Trimming the Cylinder Foot: Step by Step

Unit: Trimming & Refining
Topic: Cylinder Foot Ring
URL: https://claybook.studio/learn/trimming-the-cylinder-foot-step-by-step/

# Making the Cuts

With your cylinder inverted, centered, and secured, you are ready. Work through these steps in order; skipping ahead creates problems you will have to undo.

## Step 1: Define the Outer Wall

Using a trimming knife or the edge of a loop tool, cut a clean vertical line to mark the outer edge of the foot ring. This line sets the diameter of the foot. Make it definitive; this edge should look crisp when you are done.

## Step 2: Remove the Interior Clay

Now hollow out the interior of the base: the area inside the foot ring.

*   Start at the center and work outward toward the foot ring inner wall.
*   Use light passes, removing a few millimetres at a time.
*   Stop well before you reach the foot ring inner wall.

## Step 3: Refine the Inner Wall

Use a loop tool to cut the inner wall of the foot ring at a slight inward angle (sloping toward the center). This angle is not only attractive; it also prevents glaze from pooling inside the foot.

## Step 4: Check Wall Thickness

Stop before you think you need to and check the floor thickness with a needle tool. A safe finished floor thickness for a mug is 5–7mm. Trimming through the floor is the most common and most devastating mistake in trimming.

## Step 5: Finish the Foot Face

Lightly smooth the foot face (the flat bottom of the ring) with a damp finger or flexible rib. The pot should sit flat and stable on a surface.

## Pro Tip

Bevel the bottom outside edge of the foot ring with a trimming knife: a 45-degree chamfer. This small detail prevents chipping and looks intentional and refined.

## Trim Sequence Checklist
Keep this order every time:
* Define outer foot wall
* Remove interior excess gradually
* Refine inner wall angle
* Needle-check floor thickness
* Finish and bevel foot face

Consistent sequence reduces breakthrough mistakes.

## Explore More

The step-by-step trimming sequence mirrors the approach used in [lathe](https://en.wikipedia.org/wiki/Lathe) work, where machinists define outer dimensions first, then hollow the interior, and finish with detail cuts. Checking floor thickness with a needle tool is critical because [stoneware](https://en.wikipedia.org/wiki/Stoneware) and [earthenware](https://en.wikipedia.org/wiki/Earthenware) bodies can feel deceptively thick when leather hard, only to reveal thin spots after firing.

## Check your understanding

### Question 1: What is the most common and destructive mistake in trimming a foot ring?

- [ ] A. Making the foot ring too wide
- [x] B. Trimming through the floor of the pot
- [ ] C. Beveling the outer edge
- [ ] D. Centering the pot slightly off

Tip: Trimming through the floor of the pot. Always check floor thickness with a needle tool before you think you are done.

### Question 2: Why should the inner wall of the foot ring slope slightly inward rather than be perfectly vertical?

- [ ] A. It makes the foot ring stronger
- [x] B. It prevents glaze from pooling and looks more elegant
- [ ] C. It is easier to trim at an angle
- [ ] D. Vertical inner walls crack during firing

Tip: A slight inward slope prevents glaze from pooling inside the foot ring and also looks more elegant.