Xem Studiomeasured geometryBeta Stirling, rhombic drive, 2 in tri-clamp
Displacer and piston in one bore, two counter-rotating gears: the balanced one.
Ø46 × 90 regenerative displacer · Ø40 lapped piston · 16 mm strokes · phase ~90° from c 32 / e 8 / L 40
21 printed parts · 10 bought lines · all printed STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | ||
|---|---|---|---|---|---|---|
| Hot end | Tri-clamp end cap and gasket | tc-cap-2in-flat STEP · STL | 1 | flame side; stainless for a burner | ||
| Cylinder | Tri-clamp spool (two ferrules on a tube) | tc-spool-2in-6in STEP · STL | 1 | buy | stainless, 16 ga, 47.5 bore | |
| Joints | Tri-clamp end cap and gasket | tc-gasket-2in STEP · STL | 2 | buy | ISO 2852 Type B gaskets on the cold joints | |
| Clamps | Tri-clamp clamps (printable two-bolt) | clamp-half-2in STEP · STL | 4 | two halves per joint; stainless clamp at the flame side | ||
| Hot joint | Tri-clamp clamps (printable two-bolt) | hot-gasket-template-2in STEP · STL heat-shield-2in STEP · STL | 1 | trace on 0.5 mm graphite / mica sheet for the flame-side joint | ||
| Displacer | Tri-clamp displacers and engine heads | displacer-regenerative-2in-90 STEP · STL displacer-regenerative-cap-2in STEP · STL | 1 | slots packed with #100 mesh; Ø3 rod on the cap's M3 grub | ||
| Power piston | Tri-clamp power pistons and crank linkag | piston-2in-f020-rod STEP · STL lapping-handle-2in STEP · STL | 1 | lap to fit in the spool; 3 × 5 × 6 bushing in the crown | ||
| Piston plug | Tri-clamp free-piston kit | fp-piston-plug-2in STEP · STL | 1 | drops into the skirt; carries the 5 mm tube rod | ||
| Wrist dowels | Dowel pins | dowel-3x16 STEP · STL | 2 | buy | through bosses and plug legs | |
| Rod bushing | Bearing housings and linear supports | bushing-3x5x6 STEP · STL | 1 | buy | bronze, pressed in the piston crown | |
| Rods | Hobby brass tube (K&S) | brass-5mm STEP · STL brass-3mm STEP · STL | 1 | buy | 5 mm tube = piston rod into the plug; Ø3 displacer rod inside it | |
| Frame head | Stirling linkage fittings | rhombic-frame-head-2in STEP · STL | 1 | clamps on the spool's open ferrule; gear axes 70 mm above the face | ||
| Drive | Rhombic drive kit (Philips beta Stirling | crank-gear-30t-e8-left STEP · STL crank-gear-30t-e8-right STEP · STL link-40-1 STEP · STL link-40-2 STEP · STL link-40-3 STEP · STL link-40-4 STEP · STL yoke-upper-displacer STEP · STL yoke-lower-piston STEP · STL gear-frame-plate-c32 STEP · STL | 1 | print two frame plates; gears meshed 180° apart | ||
| Pins | Dowel pins | dowel-3x12 STEP · STL | 6 | buy | 2 crank pins + 4 link pivots | |
| Bearings | Ball bearings | bearing-625 STEP · STL | 4 | buy | in the frame plates | |
| Shafts | Shafts | shaft-5x100 STEP · STL | 2 | buy | gear shafts; one extends for the flywheel | |
| Flywheel | Crank discs | flywheel-80 STEP · STL | 1 | Ø8 bore | ||
| Shaft adapter | Stirling linkage fittings | shaft-adapter-5-to-8 STEP · STL | 1 | flywheel on the Ø5 gear shaft | ||
| Fasteners | Socket head cap screws | shcs-m3x10 STEP · STL | 4 | buy | plates to the frame head uprights | |
| Heat | Tea lights | tea-light-maxi-58x24 STEP · STL | 1 | buy |
Build order
- Print the calibration coupons; set slicer offsets.
- Print displacer + cap, piston (f020-rod), plug, lapping handle, frame head, rhombic gears, links, yokes, two plates, flywheel, adapter.
- Lap the piston in the spool until it sinks slowly with the end open; press the bushing into its crown.
- Plug into the skirt, dowels through; 5 mm tube into the plug socket (CA).
- Displacer on its Ø3 rod; rod through the piston bushing and up the tube; displacer + piston into the spool.
- Hot cap and gasket on the bottom; frame head and gasket on top; clamp both.
- 625s in the plates; plates on the frame head uprights; gears on Ø5 shafts, meshed 180° apart.
- Links to the gear pins; upper yoke on the Ø3 rod, lower yoke on the tube; set both at mid-stroke and lock the grubs.
- Flywheel on the adapter; heat the bottom; turn to start.
Long Earth Society articles: s type stirling
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is the whole print job.