Coil bobbin Ø10 core × 8 mm, Ø13 flanges — dimension sheet
Source: Xem Studio, https://xemstudio.com/objects/coil-bobbin/  (CC BY 4.0)
Basis: Bobbin sized to the stator pocket: Ø13 flanges, Ø10 core, 8 long, wire slot in one flange
Catalog version: 2026-10-20

Sizes: see table below
- The bobbin has a hollow Ø10 core (0.5 mm wall) 8 mm long, closed by two Ø13 × 0.8 mm flanges.
- A 1.2 mm slot across one flange lets the start of the winding out.
- The winding window is 1.5 mm deep (Ø10 to Ø13) and 6.4 mm long between the flanges.
- The Ø13 flanges slide into the Ø13 pockets of the axial-flux stator.

feature  size_mm
core  Ø10 × 8 (Ø9 hollow)
flanges  Ø13 × 0.8
winding window  1.5 deep × 6.4 long
wire slot  1.2 wide

Files elsewhere (not hosted by Xem Studio; license as stated by the publisher):
- Wikipedia: Axial flux motor — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Axial_flux_motor
- Wikipedia: Alternator — web — CC BY-SA 4.0 (text) — https://en.wikipedia.org/wiki/Alternator
- Hugh Piggott: A Wind Turbine Recipe Book (axial-flux alternator design) — web, PDF — Author's site [verify license at link] — http://scoraigwind.co.uk/
- Long Earth Society: Engine and rig builds — web, video — LES site — https://longearthsociety.com/engineering/

Free files (CC BY 4.0, Xem Studio; STEP + STL, 1 parts): https://xemstudio.com/files/hardware/coil-bobbin/index.json
API: https://xemstudio.com/api/geometry?object=coil-bobbin