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Swash (wobble) plates Ø40 at 10, 15 and 20°
How much stroke does a swash plate give? · Hardware · basis: A follower at radius r on a plate tilted θ moves 2 r sin θ per turn; Ø40 × 4 plate on a Ø13 × 20 hub
Long Earth Society build part. Multi-cylinder drive from one shaft, used on the LES rigs. 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
- 3 in table
Notes
- A Ø40 × 4 plate set at 10, 15 or 20° on a Ø13 × 20 hub with a Ø5 bore; a radial Ø2.5 hole (M3 tap drill) 6 mm from the hub's mid-length locks it.
- Stroke = 2 × r × sin θ. At the rim (r 20): 6.9, 10.4, 13.7 mm; at r 18: 6.3, 9.3, 12.3 mm.
- Followers spaced round one plate drive several cylinders from one shaft; each peaks at a shaft angle set by its position.
Sizes
| file | tilt | stroke r 20 | stroke r 18 | hub | bore |
|---|---|---|---|---|---|
| swash-plate-40-10deg | 10° | 6.9 | 6.3 | Ø13 × 20 | 5 |
| swash-plate-40-15deg | 15° | 10.4 | 9.3 | Ø13 × 20 | 5 |
| swash-plate-40-20deg | 20° | 13.7 | 12.3 | Ø13 × 20 | 5 |
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 |
|---|---|---|---|---|
| hub bore | Ø5 | Ø5 shaft | slide | swash-plate-* |
| set-screw hole | Ø2.5 | M3 tap drill | designed | swash-plate-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Swashplate | web | CC BY-SA 4.0 (text) |
| Long Earth Society | Engine and rig builds on extrusion frames | web, video | LES site |
Free files
★ Free files 3 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| swash-plate-40-10deg | swash (wobble) plate Ø40, 10° tilt, 6.9 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole | STEP · STL |
| swash-plate-40-15deg | swash (wobble) plate Ø40, 15° tilt, 10.4 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole | STEP · STL |
| swash-plate-40-20deg | swash (wobble) plate Ø40, 20° tilt, 13.7 mm stroke at the rim, Ø5 shaft, Ø2.5 set-screw hole | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=swash-plate-40mm
How it fits
Goes in or on
Metric shafts Ø3 to Ø10 with D-flats and clip…Ø5 shaft, M3 grubConnects to
Swash plate follower 8 × 8 × 30 with Ø8 ball endØ8 ball on the plate faceAlternatives
Eccentric sheaves Ø30 at 3, 5 and 8 mm offsetsingle strap driveAlso needed
Set-screw shaft collars Ø3 to Ø12locates the plateYou might also need
Questions
How much stroke does a swash plate give?
2 × r × sin θ: the Ø40 plate at 15° gives 9.3 mm to a follower at r 18.
Can one plate drive more than one cylinder?
Yes: followers spaced round the plate each reach top of stroke at a different shaft angle.