Xem Studiomeasured geometryLibrary › Stirling engines › Drives & mechanisms ·
Crank and wrist pins Ø3 × 12, 16, 19, 20 and 23
What size pin is a crank pin, wrist pin or link pivot on a small engine? · Hardware · basis: Solid Ø3 pins at the Ø3 pin holes of the crank discs, webs, clevises and pistons
Long Earth Society build part. The shafts, rods and pins every engine here turns on. 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
- 5 in table
Notes
- Solid Ø3 pins, 12, 16, 19, 20 and 23 long, 0.3 chamfers both ends.
- They sit fixed in the crank disc and web pin holes, the yoke and the clevis tines, and the con-rods turn on them; each fit is listed under Mating features.
- Ø3 × 16 is the wrist pin through the free-piston plug legs; Ø3 × 23 is the alpha V-twin crank pin (disc 6, two rods and two 1 mm spacers, then a full 5 mm collar) and the Ross yoke's rocking pin.
Sizes
| file | Ø | length |
|---|---|---|
| pin-3x12 | 3 | 12 |
| pin-3x16 | 3 | 16 |
| pin-3x19 | 3 | 19 |
| pin-3x20 | 3 | 20 |
| pin-3x23 | 3 | 23 |
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 |
|---|---|---|---|---|
| shafts, rods, pins | Ø3 / Ø5 / Ø8 | the bores listed on each mating object | slide | all |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 5 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| pin-3x12 | Ø3 × 12 pin: crank pin, wrist pin, link pivot | STEP · STL |
| pin-3x16 | Ø3 × 16 pin: crank pin, wrist pin, link pivot | STEP · STL |
| pin-3x19 | Ø3 × 19 pin: crank pin, wrist pin, link pivot | STEP · STL |
| pin-3x20 | Ø3 × 20 pin: crank pin, wrist pin, link pivot | STEP · STL |
| pin-3x23 | Ø3 × 23 pin: crank pin, wrist pin, link pivot | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=pins-3mm
How it fits
Goes in or on
Crank discs for a Ø5 shaft, 10 to 30 mm strokeØ3 pin hole at stroke / 2
Rod clevises for a Ø2 or Ø3 rod or a Ø5 tube, 5…Ø3 hole across the 5 mm gapConnects to
Connecting rods 30 to 80 mm centres with 623 pockets623 bore on the pinAlternatives
Dowel pins, 2–6 mmISO 2338 Ø3 dowelIn these build lists
Alpha V-twin, two 10 mL syringesTwo 10 mL syringe barrels in a 90° V on one crank pin: the V is the 90° phase.Ross yoke alpha, two parallel 10 mL syringesTwo 10 mL syringe barrels side by side on a Ross yoke: a = h gives 90° between t…You might also need
Questions
What diameter crank pin fits a 623 bearing?
Ø3, the 623 bore. The pins are 12, 16, 19, 20 and 23 long.
Which pin is the wrist pin?
Ø3 × 16 through the piston plug legs.