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8520 (820) coreless motor: Ø8.5 × 20 mm, Ø1 shaft
What are the dimensions of an 8520 coreless motor? · Hardware · basis: DFRobot FIT0796 and Makeblock 820 listings (they agree). Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.
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
- 2 in table
Notes
- Envelope only: the outside of the motor at its published sizes. The windings, magnets, brushes and bearings inside are not drawn.
- The body is a plain Ø8.5 × 20 mm cylinder; the Ø1.0 shaft stands 5 mm out of the front end.
- 8520 and 820 are the same size: 8.5 mm diameter, 20 mm long.
- The leads leave the back end; they and any bearing boss are not drawn (not listed). It is held by its body in a Ø8.5 clip or socket.
- Coreless motors have no iron in the rotor, so they turn without cogging; on small, low-power Stirling models they are used as generators or tachometer pickups.
Sizes
| feature | mm | from |
|---|---|---|
| body | Ø8.5 × 20 | DFRobot FIT0796, Makeblock 820 |
| shaft | Ø1.0 × 5 | DFRobot FIT0796, Makeblock 820 |
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 |
|---|---|---|---|---|
| shaft | Ø1.0 | propeller or pinion bore (pressed on) | press | coreless-8520* |
| body | Ø8.5 × 20 | clip or socket | socket | coreless-8520* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| DFRobot (FIT0796, as listed by Core Electronics) | Coreless micro motor 8.5 × 20 mm: Ø8.5 × 20, shaft Ø1 × 5 | web | listing verify |
| Makeblock (as listed by Studica) | 820 coreless motor: Ø8.5 × 20, output shaft Ø1.0 × 5 | web | listing verify |
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=coreless-motor-8520
Questions
What size is an 8520 motor?
Ø8.5 mm × 20 mm body with a Ø1.0 mm shaft 5 mm long.
Is an 820 motor the same as an 8520?
Yes: both are 8.5 mm × 20 mm with a 1 mm shaft.