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Ping-pong ball Ø40 mm, 0.4 mm wall
What size is a ping-pong ball? · Standard part · basis: ITTF table-tennis ball: Ø40.0, 2.7 g; drawn as a hollow sphere with a 0.4 mm wall
Long Earth Society build part. Frames, crank wire and guides for the no-budget can engine. The engines
Exact dimensions. True size, with no printing tolerance added.
- sizes
- 1 in table
Notes
- A table-tennis ball is Ø40.0 mm and weighs 2.7 g (ITTF).
- The file is a hollow sphere: Ø40.0 outside, 0.4 mm wall (Ø39.2 inside).
- At 2.7 g it is the lightest ready-made hollow sphere of that size, which makes it useful as a displacer in small demonstrator engines.
Sizes
| ball | od_mm | wall_mm | mass_g |
|---|---|---|---|
| table-tennis ball | 40.0 | 0.4 | 2.7 |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Craft stick | web | CC BY-SA 4.0 (text) |
| Wikipedia | BB gun | web | CC BY-SA 4.0 (text) |
| Wikipedia | Table tennis | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds (videos and write-ups) | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
Plain text: sheet.txt · JSON: /api/geometry?object=ping-pong-ball
How it fits
Goes in or on
Can-engine cap for 53.3, 58, 66 and 76.2 mm canslightweight displacer in a small demonstratorAlternatives
Glass marbles 1/2 in, 5/8 in and Ø16 mma solid Ø16 ballYou might also need
Questions
What is the diameter of a ping-pong ball?
40.0 mm (ITTF), weighing 2.7 g.
How thick is a ping-pong ball wall?
About 0.4 mm; the file is drawn with a 0.4 mm wall, Ø39.2 inside.