Zoetrope and Phenakistoscope Template Generator

What this generator does

Builds one sequence of frames and lays it out for the toy you choose: along a strip as long as your drum's circumference, with a slit above every frame, or round a disc, with a slit beyond every frame. Every measurement is derived from the size you give, so the template fits the drum or disc you are making.

How to use this tool

1. Choose the toy, the animation and the number of frames.
2. For a zoetrope, measure the drum you will use — a round tin or box works, or print the base — and type its diameter. For a disc, choose its size.
3. Press Make the template, read the check line, and press Play on screen to see the frames in order.
4. Print at 100%, measure the 50 mm bar, glue the sheet to thin card, and cut out the outline and every black slit.
5. Zoetrope: join the pieces in number order with the glue tabs, pictures facing in, and stand it on the base. Disc: pin it through the centre, face a mirror and look through the slits as it spins.

Understanding the controls

Toy

A zoetrope strip wraps round a drum and you look in through the slits from outside. A phenakistoscope disc is spun facing a mirror and you look through its slits at the reflection.

Animation

Five short loops drawn for this page — a ball bouncing and squashing as it lands, a pendulum, a circle that grows and shrinks, an arrow turning once, a stick figure jumping — or blank frames with a centre mark for drawing your own. Each loop's last frame leads back into its first.

Frames

8 to 16. More frames move more smoothly but each is smaller. There is one slit per frame, which keeps the picture in one place as it moves.

Drum diameter

80 to 200 mm, the inside of the drum the strip lines. The strip is π times this long, plus a glue tab on each piece, and the base disc is printed at the same diameter.

Band height

The strip has two bands: slits on top, pictures below. 35 mm gives a 70 mm strip, which suits most tins.

Disc diameter

120 to 260 mm, as long as it fits the printable area. The frames are made as large as the disc allows without touching each other, the hub or the slits.

Worked examples

Zoetrope, 150 mm drum, 12 frames, A4

The strip is 471.2 mm round, so the 12 frames and slits are 39.3 mm apart. That does not fit across A4, so it prints as three pieces of four frames, each 167.1 mm long including its glue tab, with the frames 31.5 mm square and 4 mm slits.

Phenakistoscope, 170 mm disc, 12 frames

The slits run from 66.3 mm to 83 mm out from the centre; the 12 frames are 24.4 mm squares on a ring 103.9 mm across.

Common use cases

• A science or art lesson on persistence of vision and early animation
• Drawing a twelve-frame loop on blank frames, then seeing it move
• A zoetrope strip that fits a tin you already have
• A museum-style holiday activity with materials from the recycling box

How this generator works

For a zoetrope the drum's circumference, π × diameter, is divided by the number of frames to give the pitch, and each frame and its slit share one pitch-wide cell. If the whole strip does not fit across the paper, it is cut into pieces of whole cells, each with a 10 mm glue tab at its end, so no frame is ever split by a join. For a phenakistoscope the slits are cut inward from near the rim, one at each frame's angle, and the frames sit on a ring between the hub and the slits; the ring's radius and the frame size are chosen together so that the distance between neighbouring frame centres — the chord 2r sin(180°/n) — is larger than a frame. A separate check then recomputes the circumference, the pitch, each piece's length and the total join from the diameter alone, confirms every frame appears once and in order, and for the disc re-measures the chord and the clearances.

Assumptions this tool makes

• The printer prints at 100% scale; the 50 mm bar on each sheet shows whether it did.
• The sheet is glued to thin card before cutting, so the strip stands up and the disc stays flat.

Limitations and good to know

• Only the built-in loops or blank frames; your own images cannot be uploaded and placed in the frames.
• The on-screen preview shows the frames in order; it is not proof that the printed toy will animate well for everyone, which depends on spin speed, light, the cut slits and the viewer.
• No template has been physically built and measured here yet; the dimensions are computed and checked, not proven with a ruler on a finished toy.
• The drum itself is not printed, only the strip and a base: the strip is meant to line a tin, box or rolled card tube of the stated diameter.

Common mistakes

Joining the zoetrope strip with the pictures facing out

The pictures face into the drum; you look through the slits from outside at the pictures on the far side.

Leaving the slits too narrow or ragged

Cut the full black area out. A slit that lets in less light gives a dark, blurred picture.

Spinning the disc without a mirror

A phenakistoscope is viewed in a mirror through the slits; looking straight at the disc shows only a blur.

Practical tips

• Twelve frames is a good first choice: smooth enough, and large enough to draw in.
• When drawing your own, change the drawing only a little from one frame to the next, and make the last lead back into the first.
• A bright light behind you and a dark drum interior give the clearest picture.

Privacy and your data

The template is made in your browser. With analytics consent, usage counts record that a template was made and how many frames it has; the loop, its drawings and your measurements are never sent.