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Base plate for 1.5, 2 and 3 in tri-clamp Stirling engines
What base plate mounts a tri-clamp Stirling engine and its crank? · Hardware · basis: Spool passage = ISO 2852 flange Ø + 2 (50.5 / 64 / 91); width flange + 90, depth max(70, flange + 30); M5 clearance Ø5.5 (ISO 273 medium)
Long Earth Society build part. Frame for the LES 2 in gamma on 2020. 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
- 3 in table
Notes
- A 6 mm plate with 6 mm corner radii, sized to the tri-clamp flange: 140.5 × 80.5 (1.5 in), 154 × 94 (2 in), 181 × 121 (3 in).
- On centre a passage Ø52.5 / Ø66 / Ø93 (flange Ø + 2) that the spool or its cap goes through without contact.
- Either side, a 16 × 3.4 slot at flange radius + 18 for the crank stands' M3 screws; at the ends, 4 × Ø5.5 holes (50 mm apart across, 12 in from each end) for M5 into 2020 extrusion.
Sizes
| file | plate | spool passage | stand slots at | M5 holes |
|---|---|---|---|---|
| base-plate-1.5in | 140.5 × 80.5 × 6 | 52.5 | ±43.25 | 4 × Ø5.5, 116.5 × 50 |
| base-plate-2in | 154 × 94 × 6 | 66 | ±50 | 4 × Ø5.5, 130 × 50 |
| base-plate-3in | 181 × 121 × 6 | 93 | ±63.5 | 4 × Ø5.5, 157 × 50 |
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 |
|---|---|---|---|---|
| base-plate spool passage | flange Ø + 2 | ferrule flange passes through | designed | base-plate-* |
| base-plate M5 holes | Ø5.5 | M5 screw clearance (ISO 273 medium) | designed | base-plate-* |
| crank-stand slots | 3.4 × 16, 2 per stand at y ±21 (42 apart), x ±(flange/2 + 16) | crank-stand-625 foot slots, M3 screws | designed | base-plate-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Beam engine | web | CC BY-SA 4.0 (text) |
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| base-plate-1.5in | base plate for a 1.5 in tri-clamp engine, 140.5 × 80.5 × 6: Ø52.5 spool passage (flange Ø + 2), two crank-stand-625 seats at x ±41.25, each 2 × M3 slots 3.4 × 16 (along y) on y ±21 (the stand's 42 mm foot pitch), 4 × M5 clearance (Ø5.5) at x ±58.25, y ±25 to 2020 extrusion | STEP · STL |
| base-plate-2in | base plate for a 2 in tri-clamp engine, 154 × 94 × 6: Ø66 spool passage (flange Ø + 2), two crank-stand-625 seats at x ±48, each 2 × M3 slots 3.4 × 16 (along y) on y ±21 (the stand's 42 mm foot pitch), 4 × M5 clearance (Ø5.5) at x ±65, y ±25 to 2020 extrusion | STEP · STL |
| base-plate-3in | base plate for a 3 in tri-clamp engine, 181 × 121 × 6: Ø93 spool passage (flange Ø + 2), two crank-stand-625 seats at x ±61.5, each 2 × M3 slots 3.4 × 16 (along y) on y ±21 (the stand's 42 mm foot pitch), 4 × M5 clearance (Ø5.5) at x ±78.5, y ±25 to 2020 extrusion | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=tri-clamp-engine-base-plate
How it fits
Parts that fit it
Crosshead guide, Ø8 bore × 30flanged to the frame in line with the liner
Beam pivot post, 60 mm2 × M3 to the base
Crank stands with a 625 pocket, 40 and 60 mm axis…M3 through the foot slots into the plate slotsGoes in or on
Aluminium T-slot extrusion4 × M5 into 2020Connects to
Tri-clamp spool, 1.5 and 2 inchspool through the passage
Rod clevises for a Ø2 or Ø3 rod or a Ø5 tube, 5…625 crank stands in the slots
Flanged power cylinder liner Ø16, 20, 25, 30liner flange on the plateAlso needed
Slide-in T-nuts for 20, 30, 40 and 10-series…T-nutsYou might also need
Questions
How do I mount a tri-clamp Stirling engine?
On the base plate: spool through the Ø66 passage (2 in), crank stands in the slots, 4 × M5 down into 2020 or a board.
What size is the 2 in base plate?
154 × 94 × 6 with a Ø66 passage.