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LTD Stirling chamber ring, Ø100 and Ø150 × 20
What size is the chamber ring of a coffee-cup Stirling engine? · Hardware · basis: Chamber height 20: an 8 mm displacer at 10 mm stroke (crank-disc-b3-stroke10) with 1 mm at each end; M3 tap drill Ø2.5
Long Earth Society build part. The warm-hand demonstrator. 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
- 2 in table
Notes
- The wall of the LTD displacer chamber, between the bottom and top plates. Bore Ø100 or Ø150, 20 tall, 10 mm wall (outside Ø120 / Ø170).
- Six Ø2.5 holes (M3 tap drill) through its height on a Ø112 / Ø162 circle: an M3 × 12 comes in from each plate.
- The displacer runs inside with a 2 mm radial gap by design; nothing moving touches the ring.
Sizes
| file | bore | outside | height | screw circle |
|---|---|---|---|---|
| ltd-100-chamber-ring-h20 | 100 | 120 | 20 | 112 |
| ltd-150-chamber-ring-h20 | 150 | 170 | 20 | 162 |
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 |
|---|---|---|---|---|
| chamber-ring screw holes | Ø2.5 through | M3 tap drill (an M3 × 12 from each plate) | designed | ltd-100-chamber* |
| chamber-ring screw holes | Ø2.5 through | M3 tap drill (an M3 × 12 from each plate) | designed | ltd-150-chamber* |
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) |
| James R. Senft | An Introduction to Low Temperature Differential Stirling Engines | book | Moriya Press verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| ltd-100-chamber-ring-h20 | chamber ring Ø100 bore × 20 tall, 10 mm wall, 6 × Ø2.5 (M3 tapped) through on a Ø112 circle; the displacer runs inside | STEP · STL |
| ltd-150-chamber-ring-h20 | chamber ring Ø150 bore × 20 tall, 10 mm wall, 6 × Ø2.5 (M3 tapped) through on a Ø162 circle; the displacer runs inside | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=ltd-chamber-ring
How it fits
Connects to
LTD Stirling top plate with syringe socket, Ø120…top face, 6 × M3
LTD Stirling bottom plate, Ø120 and Ø170bottom face, 6 × M3
LTD Stirling displacer Ø96 × 8 and Ø146 × 8displacer inside, 2 mm radial gapIn these build lists
LTD coffee-cup engineRuns on a cup of coffee: wide thin displacer, small piston.You might also need
Questions
How tall is the chamber of the LTD Stirling engine here?
20 mm, for an 8 mm thick displacer moving 10 mm: 1 mm to spare at each end.
What displacer goes in the Ø100 chamber ring?
The Ø96 × 8 LTD displacer: 2 mm radial gap, designed.