Xem Studiomeasured geometryRoss yoke alpha, two parallel 10 mL syringes
Two syringes side by side, one crank, a Ross yoke solved for 90° and near-straight piston motion.
e 6 · yoke a = h = 20 · link 40 · rods 60 · strokes 17 mm (2.8 mL each) · 90.0° · rod angle < 1°
Exact dimensions. Every part is drawn at true size with no printing tolerance; each part's page lists its mating features and the fit each joint needs, so open those by your process's clearance before making the parts.
23 parts, every one a file here · all printed STL URLs · Markdown · tick lines as you go (saved in this browser)
| subsystem | object | parts | qty | note | |
|---|---|---|---|---|---|
| Frame | Ross yoke alpha for two parallel 10 mL s | ross-frame-2x-10ml STEP · STL | 1 | print on its back | |
| Yoke | Ross yoke alpha for two parallel 10 mL s | ross-yoke-a20-h20 STEP · STL | 1 | a = h = 20: 90° between the pistons | |
| Rocking link | Ross yoke alpha for two parallel 10 mL s | rocking-link-40 STEP · STL | 1 | frame post to the yoke's top-middle pin | |
| Crank disc | Ross yoke alpha for two parallel 10 mL s | ross-crank-disc-e6 STEP · STL | 1 | e 6, the yoke's bottom corner rides its pin | |
| Con-rods | Ross yoke alpha for two parallel 10 mL s | conrod-60 STEP · STL | 2 | yoke corners to the piston forks | |
| Pistons | Syringe pistons | syringe-piston-10ml-f008 STEP · STL | 2 | lap into the barrels, run dry | |
| Cylinders | Plastic syringes 1–60 mL as pistons and | syringe-10ml STEP · STL | 2 | barrels only; flanges turned front-to-back | |
| Crankshaft | Stirling shafts and rods | crankshaft-5x80-dflat STEP · STL | 1 | ||
| Bearings | Ball bearings | bearing-625 STEP · STL | 2 | both ends of the boss | |
| Pins | Stirling shafts and rods | pin-3x20 STEP · STL pin-3x12 STEP · STL | 1 | 2 × 3×20 (crank pin, rocking pin) + 1 × 3×20 (frame post) + 2 × 3×12 (rod pins). | |
| Spacers | Stirling shafts and rods | spacer-5mm-t2 STEP · STL spacer-3mm-t1 STEP · STL spacer-3mm-t5 STEP · STL spacer-3mm-t2 STEP · STL | 1 | 2 on the shaft; 1 between disc / yoke / rods; 5 + 2 under the link | |
| Pin collars | Shafts | collar-3mm STEP · STL | 3 | crank pin, rocking pin, frame pin | |
| Piston pins | Dowel pins | dowel-3x12 STEP · STL | 2 | through each piston fork | |
| Flywheel | Nut-weighted flywheels | flywheel-100-m8-b5 STEP · STL | 1 | behind the boss | |
| Flywheel weights | Nut-weighted flywheels | nut-m8 STEP · STL | 12 | remove until it still carries | |
| Transfer | Alpha V-twin | transfer-tee-4mm STEP · STL | 1 | between the tips, mesh plug inside | |
| Tube | Silicone and PU tube | silicone-tube-4x6-50 STEP · STL | 1 | short | |
| Mount | Aluminium T-slot extrusion | 2020-100 STEP · STL | 1 | foot: 2 × M5 at 50 mm | |
| Heat | Tea lights | tea-light-38x16 STEP · STL | 1 | under the hot barrel's tip end |
Build order
- Print frame, yoke, link, crank disc, two con-rods, two syringe pistons, shaft, pins, spacers, flywheel, tee.
- Lap each piston into its barrel; no oil.
- 625s into the boss; shaft with the 2 mm spacer; crank disc on the D-flat.
- Press the 3 × 12 pins into the yoke corners and a 3 × 20 into its top-middle; yoke onto the crank pin (1 mm spacer), collar.
- Con-rods on the corner pins; rocking link on the top-middle pin over 5 + 2 mm spacers and onto the frame-post pin; collars.
- Pistons onto the rods with 3 × 12 dowels; barrels over them from below, tips up, flanges front-to-back; pinch screws.
- Tee and mesh between the tips; flywheel behind the boss; heat one tip end; flick.
Agents: each row's object has /api/geometry?object=slug and the MCP tool get_free_files; the STL list above is every part.