How to play
  1. Press Turn the pencil (or hold it down, or drag across the picture).
  2. Watch the blade shave a curl of wood, and the pencil's end become a cone.
  3. Count how many turns until it is sharp. Then press New pencil.
  4. Tap any part, or use ◀ ▶, to zoom in and read what it does. Take it apart slides the pieces off along their axes.
HB · OAKCREST
Turns0 Tip width7.0 mm Point angle22° Pencil48 mm

A new pencil with a flat end. Turn it and watch the end change shape.

15 parts
Steel blade: its edge lies along the side of the coneCone-shaped hole, 22° across, cut open so you can see inA hand pencil sharpener, cut in half. The hole is a cone 22° across. Each turn the blade shaves a thin curl off and the pencil slides 1.6 mm deeper, so the pencil's end takes the hole's shape: about 13 turns make a flat-ended pencil sharp. After that the cone can't get any pointier, because its angle is set by the hole, so extra turns only make the pencil shorter.