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CD and HDD-platter flywheel hubs: Ø15 and Ø25 spigots for Ø3 / 5 / 8 shafts
What are the dimensions of a hub that mounts a CD or hard-drive platter on a shaft? · Standard part · basis: Spigot at the disc's centre hole (CD Ø15, 3.5 in HDD platter Ø25); bore at the shaft; M3 tap drill Ø2.5 for the set screw
Long Earth Society build part. The printed parts for the LES can engine, sized to the cans, syringes, CDs and bearings in the library. The engines
Exact dimensions. Every file is drawn at true size with no printing tolerance. The holes and pins that meet another part are listed below under Mating features, with the fit each joint needs; open those by your printer's or process's clearance before making the part. Mating features
- sizes
- 5 in table
Notes
- A hub that carries a CD/DVD or a 3.5 in hard-drive platter as a flywheel. The spigot is the disc's centre hole exactly: Ø15 for a CD, Ø25 for a platter, 1.3 tall.
- As drawn, the spigot sits between a Ø(spigot + 8) × 2 collar below and the Ø(spigot + 8) hub body above (Ø23 for CD hubs, Ø33 for platter hubs), 12 mm overall.
- Bores: Ø3, Ø5 or Ø8 (fit: slide) for the shaft, with a Ø2.5 radial hole (M3 tap size) 6 mm above the lower collar for an M3 set screw.
Sizes
| file | disc | spigot | bore | outside | height |
|---|---|---|---|---|---|
| hub-cd-15-to-3 | CD / DVD | 15 | 3 | 23 | 12 |
| hub-cd-15-to-5 | CD / DVD | 15 | 5 | 23 | 12 |
| hub-cd-15-to-8 | CD / DVD | 15 | 8 | 23 | 12 |
| hub-platter-25-to-5 | 3.5 in HDD platter | 25 | 5 | 33 | 12 |
| hub-platter-25-to-8 | 3.5 in HDD platter | 25 | 8 | 33 | 12 |
Mating features
Drawn at the exact size. Open press, slide, run and socket features by your process's clearance; leave designed gaps and clamp fits as drawn.
| feature | exact | mates with | fit | files |
|---|---|---|---|---|
| CD hub spigot | Ø15 | CD / DVD centre hole | press | hub-cd-* |
| platter hub spigot | Ø25 | 3.5 in HDD platter hole | press | hub-platter-* |
| hub bore | Ø3 / Ø5 / Ø8 | shaft (M3 set screw) | slide | hub-* |
| hub set-screw hole | Ø2.5 | M3 tap drill | designed | hub-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Can engine build | video, web | LES site |
| Long Earth Society | Engine builds (videos and write-ups) | web, video | LES site |
Free files
★ Free files 5 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| hub-cd-15-to-3 | CD / DVD hub: Ø23 × 10 boss with a Ø3 shaft bore and M3 set-screw hole (Ø2.5), Ø15 × 1.2 spigot that takes the disc | STEP · STL |
| hub-cd-15-to-5 | CD / DVD hub: Ø23 × 10 boss with a Ø5 shaft bore and M3 set-screw hole (Ø2.5), Ø15 × 1.2 spigot that takes the disc | STEP · STL |
| hub-cd-15-to-8 | CD / DVD hub: Ø23 × 10 boss with a Ø8 shaft bore and M3 set-screw hole (Ø2.5), Ø15 × 1.2 spigot that takes the disc | STEP · STL |
| hub-platter-25-to-8 | 3.5 in HDD platter hub: Ø33 × 10 boss with a Ø8 shaft bore and M3 set-screw hole (Ø2.5), Ø25 × 1.27 spigot that takes the platter | STEP · STL |
| hub-platter-25-to-5 | 3.5 in HDD platter hub: Ø33 × 10 boss with a Ø5 shaft bore and M3 set-screw hole (Ø2.5), Ø25 × 1.27 spigot that takes the platter | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=flywheel-disc-hub
How it fits
Goes in or on
CD / DVD disc Ø120 × 1.2 mm with Ø15 holeØ15 / Ø25 spigot in the disc's centre holeConnects to
Crankshafts Ø3, Ø5 and Ø8 with full-length D-flatØ3 / Ø5 / Ø8 shaft in the bore
Craft sticks 114 × 10 × 2 mm and jumbo 150 × 18 ×…Ø3 skewer in the Ø3 boreAlternatives
Flywheels Ø100–Ø200 with hex-nut rim pocketsa nut-weighted flywheel instead of a discAlso needed
Set screws, M3–M8M3 set screw in the Ø2.5 holeYou might also need
Questions
What is the hole in a CD?
Ø15; the CD hubs here have a Ø15 spigot 1.3 tall to match it.
Which hub goes on a bamboo skewer?
Hub-cd-15-to-3: Ø3 bore, Ø15 spigot, M3 set screw.