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Connecting rods 30 to 80 mm centres with 623 pockets
What does a model engine connecting rod with 623 bearings look like? · Hardware · basis: Flat rod 5 thick, Ø14 ends with Ø10 pockets (623 OD) at the stated centres
Long Earth Society build part. The crank train from the LES tri-clamp Stirling builds, parametrized. 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
- A flat rod 5 thick: an 8 mm wide web between two Ø14 bosses, each with a Ø10 pocket through for a 623 (3 × 10 × 4).
- Centres 30, 40, 50, 60 and 80 mm; overall length centres + 14.
- Both ends run on Ø3 pins. A rod at least twice the stroke keeps the piston side load low; the 2 in engines pair conrod-50 with a 20 mm stroke.
Sizes
| file | centres | overall | thickness | pockets |
|---|---|---|---|---|
| conrod-30 | 30 | 44 | 5 | 2 × Ø10 |
| conrod-40 | 40 | 54 | 5 | 2 × Ø10 |
| conrod-50 | 50 | 64 | 5 | 2 × Ø10 |
| conrod-60 | 60 | 74 | 5 | 2 × Ø10 |
| conrod-80 | 80 | 94 | 5 | 2 × Ø10 |
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 |
|---|---|---|---|---|
| con-rod bearing pockets | Ø10 | 623 bearing | press | conrod-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Crank (mechanism) | web | CC BY-SA 4.0 (text) |
| Wikipedia | Flywheel | web | CC BY-SA 4.0 (text) |
| Wikipedia | Stirling engine | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine builds that use these parts (videos and write-ups) | 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
| conrod-30 | connecting rod, 30 mm centres, Ø10 pockets for 623 bearings both ends, 5 thick | STEP · STL |
| conrod-40 | connecting rod, 40 mm centres, Ø10 pockets for 623 bearings both ends, 5 thick | STEP · STL |
| conrod-50 | connecting rod, 50 mm centres, Ø10 pockets for 623 bearings both ends, 5 thick | STEP · STL |
| conrod-60 | connecting rod, 60 mm centres, Ø10 pockets for 623 bearings both ends, 5 thick | STEP · STL |
| conrod-80 | connecting rod, 80 mm centres, Ø10 pockets for 623 bearings both ends, 5 thick | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=connecting-rods-623
How it fits
Connects to
Crank discs for a Ø5 shaft, 10 to 30 mm stroke623 on the Ø3 crank pin
Rod clevises for a Ø2 or Ø3 rod or a Ø5 tube, 5…5 mm rod end in the 5 mm gap
Tri-clamp power pistonwrist-pin endAlso needed
Ball bearings, 683 to 6210 and flanged F6xx623 in each Ø10 pocketIn these build lists
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Questions
What bearings go in the connecting rod?
A 623 (3 × 10 × 4) in each Ø10 pocket, on Ø3 pins.
How long a con-rod for a 20 mm stroke?
At least 40 mm centres; the 2 in tri-clamp engines run 50.