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Ø400 flywheel on a Ø12 shaft

Name: Ø400 flywheel on a Ø12 shaft dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

How big a flywheel does a slow large Stirling engine need? · Hardware · basis: Exact geometry

Long Earth Society build part. Parts of the HTD engines. 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: 1 in table

Notes

Rim r 175..200 × 30 wide, 5 web, Ø50 × 40 hub, two M6 grubs. J = 0.104 kg·m² (3.9 kg) at 2.7 g/cm³, 0.305 kg·m² (11.3 kg) at 7.9 g/cm³.
On the HTD it hangs outside the seal cap at x 186.5..226.5; a slow flat engine needs the inertia (the speed swing is on the list page).

Sizes

od_mm	rim_mm	web_mm	hub_mm	J_kgm2_2.7	J_kgm2_7.9
400.0	175–200 × 30	5.0	Ø50 × 40	0.104	0.305

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
bore	Ø12 × 40	Ø12 shaft, two M6 grubs (drawn Ø6)	slide	all

Where the files are

Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.

Long Earth Society

Engine builds

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

flywheel-400-b12

Ø400 flywheel: rim r 175..200 × 30, web 5, hub Ø50 × 40, Ø12 bore, two M6 tapped radial holes

STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=htd-flywheel-400

Ø400 flywheel on a Ø12 shaft, isometric render of a generated part — Render of flywheel-400-b12 from the free STEP; not to scale.

How it fits

In these build lists

HTD engine, 10 in tri-clamp…A big flat gamma Stirling for a propane burner: a Ø240 displacer in a 10 in weld…

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Questions

How heavy is it?

3.9 kg at 2.7 g/cm³, 11.3 kg at 7.9 g/cm³.