# Build list: Alpha V-twin, two 10 mL syringes

> What parts do I need to build an Alpha V-twin, two 10 mL syringes?

- Category: Stirling engines › Guide
- Kind: List / guide
- Basis: Every printed part is a free file on this site.
- Page: https://xemstudio.com/objects/list-alpha-v-twin-syringe/ · JSON: https://xemstudio.com/api/geometry?object=list-alpha-v-twin-syringe · Plain text: https://xemstudio.com/objects/list-alpha-v-twin-syringe/sheet.txt
- License: dimension sheet CC BY 4.0 (Xem Studio); linked files under their publishers' licenses

**Exact dimensions.** True size, with no printing tolerance added.

## Notes

- Two syringes in a 90° V on one crank pin: the alpha with no displacer, checked so the pistons stay in and the rods clear.
- Numbers: stroke 16 · rod 60 · 2.6 mL per cylinder · 90° phase from the V · Ø100 nut flywheel

## Sizes

| subsystem | object | parts | qty | note |
|---|---|---|---|---|
| Frame | alpha-v-twin-frame | alpha-frame-10ml | 1 | print on its back; both barrel axes pass through the crank axis |
| Crank disc | alpha-v-twin-frame | alpha-crank-disc-s16 | 1 | ONE pin: the 90° V gives the 90° phase |
| Con-rods | alpha-v-twin-frame | alpha-conrod-60 | 2 | 60 mm so they clear the barrel walls |
| Pistons | syringe-pistons | syringe-piston-10ml-f008 | 2 | replace the plungers; lap into the barrels, run dry |
| Cylinders | plastic-syringes | syringe-10ml | 2 | barrels only. |
| Crankshaft | stirling-shafts-and-rods | crankshaft-5x80-dflat | 1 | print flat side down, 100 % infill |
| Bearings | ball-bearings-metric | bearing-625 | 2 | both ends of the boss |
| Crank pin | stirling-shafts-and-rods | pin-3x20 | 1 | pressed 6 mm into the disc. |
| Spacers | stirling-shafts-and-rods | spacer-5mm-t2, spacer-3mm-t1 | 1 | 2 mm boss-to-disc on the shaft; 1 mm disc-rod and rod-rod on the pin |
| Pin collar | shaft-collars-clips-and-shafts | collar-3mm | 1 | keeps rod 2 on the pin |
| Piston pins | dowel-pins-metric | dowel-3x12 | 2 | through each piston fork |
| Flywheel | nut-weighted-flywheels | flywheel-100-m8-b5 | 1 | behind the boss; 12 M8 nuts, remove until it still carries |
| Flywheel weights | nut-weighted-flywheels | nut-m8 | 12 | remove until it still carries |
| Transfer | alpha-twin-crank-90 | transfer-tee-4mm | 1 | between the syringe tips; regenerator plug of #100 mesh in the tee |
| Tube | silicone-tube-and-fittings | silicone-tube-4x6-50 | 1 | keep it short |
| Mount | t-slot-extrusions | 2020-100 | 1 | foot: 2 × M5 at 50 mm; frame at the rail's end so the flywheel hangs clear |
| Heat | tea-light-candles | tea-light-38x16 | 1 | under the hot barrel's tip end |

## Where the files are

- Long Earth Society: [Engine builds](https://longearthsociety.com/engineering/) — web, video — LES site

## Build order

1. Print the frame, crank disc, two con-rods, two syringe pistons, crankshaft, pin, spacers, flywheel, transfer tee.
2. Lap each piston into its barrel until it sinks slowly with the tip open; no oil.
3. Press the 625s into the boss; shaft through with the 2 mm spacer; crank disc on its D-flat, grub tight.
4. Pin into the disc; 1 mm spacer, rod 1 (to the +45° socket), 1 mm spacer, rod 2; 3 mm collar on the pin end.
5. Pistons onto the rods with the 3 × 12 dowels; slide the barrels over the pistons from the crank side, tip outward, flange against the socket; pinch screws.
6. Tee with a mesh plug between the tips on short silicone tube; flywheel on the back of the shaft.
7. Heat the hot barrel's tip end; flick the flywheel.

All printed STLs: https://xemstudio.com/objects/list-alpha-v-twin-syringe/stl-list.txt

## Questions

**What parts do I need to build an Alpha V-twin, two 10 mL syringes?**

18 parts, every one a free STEP/STL on this site; see the table and the build order on this page.

**How do I download every STL for this build at once?**

The stl-list.txt on this page lists every printed part's STL URL.

## Fits with

- [Alpha V-twin frame for two 10 mL syringes: frame, crank disc and con-rods sized so it actually runs](https://xemstudio.com/objects/alpha-v-twin-frame/)
- [Syringe pistons: ring-less printed pistons with a con-rod fork for 10, 20 and 30 mL syringe barrels](https://xemstudio.com/objects/syringe-pistons/)
- [Plastic syringes 1–60 mL as pistons and cylinders](https://xemstudio.com/objects/plastic-syringes/)
- [Stirling shafts and rods: Ø3 rods, Ø5 / Ø8 D-flat crankshafts, Ø5 tube rods, Ø3 pins, thrust spacers](https://xemstudio.com/objects/stirling-shafts-and-rods/)
- [Ball bearings, 683 to 6210 and flanged F6xx (ISO 15)](https://xemstudio.com/objects/ball-bearings-metric/)
- [Shafts, D-flats, set-screw collars, E-clips (DIN 6799) and circlips (DIN 471)](https://xemstudio.com/objects/shaft-collars-clips-and-shafts/)
- [Dowel pins, 2–6 mm (ISO 2338 / DIN 6325)](https://xemstudio.com/objects/dowel-pins-metric/)
- [Nut-weighted flywheels: Ø100–200 with hex pockets for M8, M10, M12, 3/8 and 1/2 in nuts](https://xemstudio.com/objects/nut-weighted-flywheels/)
- [Alpha V-twin: 90° two-pin crank discs, V block, transfer tee](https://xemstudio.com/objects/alpha-twin-crank-90/)
- [Silicone and PU tube, hose barbs and push-fit fittings (the transfer port)](https://xemstudio.com/objects/silicone-tube-and-fittings/)
- [Aluminium T-slot extrusion: 2020, 2040, 2060, 2080, V-slot, 3030, 3060, 4040, 4080, 1010, 1515](https://xemstudio.com/objects/t-slot-extrusions/)
- [Tea lights, maxi tea lights and votives (heat sources)](https://xemstudio.com/objects/tea-light-candles/)