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Crosshead Ø8 × 24 for a Ø3 piston rod
What are the dimensions of a crosshead for a small Stirling engine piston rod? · Hardware · basis: Ø8 slider in the Ø8 guide (fit: run); clevis slot at the 5 mm con-rod thickness
Long Earth Society build part. The power piston and liner on the LES gamma. 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
- 4 in table
Notes
- A Ø8 × 24 slider on the Ø3 piston rod (Ø3 bore, fit: slide) that runs in the Ø8 crosshead guide (fit: run).
- A 5 mm slot, 13 deep, takes the 5 mm con-rod end (fit: run); a Ø3 hole through both cheeks 5 mm from the top takes the wrist pin (fit: press).
- The con-rod's sideways push lands on the crosshead and guide, so the piston moves only along its axis.
Sizes
| parameter | value |
|---|---|
| slider | Ø8 × 24 |
| rod bore | Ø3 |
| clevis slot | 5 × 10 deep |
| wrist-pin hole | Ø3, 5 from top |
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 |
|---|---|---|---|---|
| crosshead OD | Ø8 | crosshead-guide bore (slides in it) | run | crosshead-8mm* |
| crosshead rod bore | Ø3 | Ø3 piston rod | slide | crosshead-8mm* |
| crosshead clevis slot | 5 | 5 mm con-rod end | run | crosshead-8mm* |
| crosshead wrist-pin hole | Ø3 | wrist-pin-3x16 | press | crosshead-8mm* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Crosshead | web | CC BY-SA 4.0 (text) |
| Wikipedia | Piston | web | CC BY-SA 4.0 (text) |
| James R. Senft | Miniature Stirling engine piston fits (LTD book) | book | reference verify |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 1 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| crosshead-8mm-rod3 | crosshead: Ø8 × 24 slider on a Ø3 piston rod, 5 mm clevis slot 13 deep for the con-rod (floor 8 below the pin) and a Ø3 wrist-pin hole 5 below the top (keeps side load off the piston) | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=crosshead-8mm
Questions
Why use a crosshead on a Stirling engine?
It takes the con-rod's side load so the piston only moves axially and keeps its seal round.
What con-rod fits the crosshead?
One 5 mm thick, in the 5 mm clevis slot on a Ø3 wrist pin.