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LTD Stirling bottom plate, Ø120 and Ø170
What are the dimensions of the bottom (hot) plate of a coffee-cup Stirling engine? · Hardware · basis: Same outline and M3 hole circle as the LTD top plate and chamber ring; M3 clearance Ø3.4 (ISO 273)
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 hot plate of the LTD engine: the cup or the hand warms it and the heat goes through it into the air in the chamber.
- Ø120 × 3 for the 100 chamber, Ø170 × 3 for the 150, with 6 × Ø3.4 on a Ø112 / Ø162 circle (at 30°, 90°, …) matching the chamber ring and top plate; an M3 × 12 from below goes into each tapped ring hole.
Sizes
| file | plate | holes | screw circle | centre mark |
|---|---|---|---|---|
| ltd-100-bottom-plate | Ø120 × 3 | 6 × Ø3.4 | 112 | 3.2 |
| ltd-150-bottom-plate | Ø170 × 3 | 6 × Ø3.4 | 162 | 3.2 |
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 |
|---|---|---|---|---|
| plate screw holes | Ø3.4 | M3 screw clearance (ISO 273) | designed | ltd-100-bottom* |
| plate screw holes | Ø3.4 | M3 screw clearance (ISO 273) | designed | ltd-150-bottom* |
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-bottom-plate | bottom (hot) plate Ø120 × 3, 6 × Ø3.4 (M3 clearance) on a Ø112 circle at 30° + 60° steps | STEP · STL |
| ltd-150-bottom-plate | bottom (hot) plate Ø170 × 3, 6 × Ø3.4 (M3 clearance) on a Ø162 circle at 30° + 60° steps | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=ltd-bottom-plate
How it fits
Connects to
LTD Stirling chamber ring, Ø100 and Ø150 × 206 × M3 on the Ø112 / Ø162 circle, ring between the plates
LTD Stirling top plate with syringe socket, Ø120…same outline and hole circle on the other face of the ringAlso needed
Socket head cap screws, M2–M86 × M3 through plate, ring and plateIn these build lists
LTD coffee-cup engineRuns on a cup of coffee: wide thin displacer, small piston.You might also need
Questions
How big is the bottom plate of a 100 mm LTD Stirling?
Ø120 × 3 with six Ø3.4 holes on a Ø112 circle.
Does the bottom plate have the same holes as the top plate?
Yes: 6 × Ø3.4 on the same Ø112 / Ø162 circle as the top plate; the chamber ring between them has the same holes tapped M3.