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Thermoacoustic fin sleeve for the flame-shroud band: 2 in tube, 34 mm, fins to Ø72, ears inside Ø73

Name: Thermoacoustic fin sleeve for the flame-shroud band: 2 in tube, 34 mm, fins to Ø72, ears inside Ø73 dimension sheet
Creator: Xem Studio
License: https://creativecommons.org/licenses/by/4.0/

What fin sleeve fits inside the thermoacoustic flame shroud? · Hardware · basis: Design values: the band of ta-shroud-2in-front / -back is Ø75 inside (r 37.5) and 35 between its end walls; the sleeve, its ears, M4 heads and nuts stay inside r 37

Long Earth Society build part. The fin sleeve of my modular thermoacoustic engine. 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

Two halves clamped round a plain 2 in tube over a hot exchanger, inside the flame shroud's band: the flame gas from the flue passes between the fins, the fins conduct into the tube wall and the wall into the exchanger inside.
Everything stays inside the band: fins to r 36, ears to r 36, the M4 × 12 head and nut at x ±32 inside r 37; 34 long in the band's 35. No fin within ±20° of the ears, so the screw head and nut have room.
Optional: the engine runs without it (the flame heats the bare tube). Fits: bore clamps the tube (1 mm split take-up); ear holes M4 clearance.

Sizes

part	bore_mm	length_mm	fins	fin_tip_dia_mm	ears_to_r_mm	screws
ta-fin-sleeve-half-2in-34-r36	50.8	34.0	20 per sleeve, 1.5 thick	72.0	36.0	2 × M4 × 12 + nuts

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	Ø50.8	2 in tube outside over the hot exchanger	clamp	all
split	1.0 total (0.5 per half)	the other half	clamp	all
ear holes	Ø4.5 at x ±32	M4 clearance (ISO 273 medium)	designed	all
fins and ears	to r 36	flame shroud band's chamber wall at r 37.5 (no contact)	designed	all

Where the files are

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

Xem Studio	tools/gen_ta_modular.py: the section geometry, the network model and every number on these pages	code	CC BY 4.0
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

ta-fin-sleeve-half-2in-34-r36

fin-sleeve half (y ≥ 0.5): bore Ø50.8, wall 3, radial fins 1.5 thick to Ø72 every 15° (none within ±20° of the ears), 34 long; ears x ±27.9..36 with Ø4.5 at x ±32: fits inside the flame shroud's band

STEP · STL

Plain text: sheet.txt · JSON: /api/geometry?object=thermoacoustic-shroud-fin-sleeve