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Flexure rim clamp plate: Ø40 to Ø120 × 3 mm, 3 × M3
What clamps the rims of a flexure bearing stack? · Hardware · basis: Ring = the flexure rim (OD, width 0.12 OD), 3 mm thick, 3 × Ø3.4 on the 0.88 × OD circle
Long Earth Society build part. Flexure-suspended displacer on the LES free-piston test bed. 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 3 mm ring the size of the leaf rim with three Ø3.4 holes on the rim-hole circle: it clamps the stack of leaf rims and spacers down to the head.
- Ø40 to Ø120; hole circles Ø35.2 / 52.8 / 70.4 / 88 / 105.6, matching the leaves and the tri-clamp flexure head.
Sizes
| od_mm | width_mm | thickness_mm | holes | hole_circle_mm |
|---|---|---|---|---|
| 40 | 4.8 | 3 | 3 × Ø3.4 | 35.2 |
| 60 | 7.2 | 3 | 3 × Ø3.4 | 52.8 |
| 80 | 9.6 | 3 | 3 × Ø3.4 | 70.4 |
| 100 | 12 | 3 | 3 × Ø3.4 | 88.0 |
| 120 | 14.4 | 3 | 3 × Ø3.4 | 105.6 |
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 |
|---|---|---|---|---|
| clamp-plate holes | Ø3.4 | M3 screw clearance | designed | clamp-plate-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| NASA (NTRS, public domain) | Free-piston Stirling convertor flexure bearing development and life testing (2005) | US Government work, public domain | |
| NASA (NTRS, public domain) | Flexure bearing design for free-piston Stirling engines (1986) | US Government work, public domain | |
| NASA (NTRS, public domain) | Advanced Stirling Radioisotope Generator (ASRG) engineering unit (2011) | US Government work, public domain | |
| Wikipedia | Flexure bearing | web | CC BY-SA 4.0 (text) |
| Sunpower (AMETEK) | Free-piston Stirling technology overview | web | Sunpower site verify |
| 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
| clamp-plate-40 | rim clamp plate Ø40, 3 thick, 3 × Ø3.4 (M3) on R17.6 | STEP · STL |
| clamp-plate-60 | rim clamp plate Ø60, 3 thick, 3 × Ø3.4 (M3) on R26.4 | STEP · STL |
| clamp-plate-80 | rim clamp plate Ø80, 3 thick, 3 × Ø3.4 (M3) on R35.2 | STEP · STL |
| clamp-plate-100 | rim clamp plate Ø100, 3 thick, 3 × Ø3.4 (M3) on R44 | STEP · STL |
| clamp-plate-120 | rim clamp plate Ø120, 3 thick, 3 × Ø3.4 (M3) on R52.8 | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=flexure-rim-clamp-plate
How it fits
Goes in or on
Planar spiral flexure bearing leaveson top of the leaf rimsConnects to
Tri-clamp flexure headsame three-hole circleAlso needed
Socket head cap screws, M2–M83 × M3In these build lists
Free-piston Stirling, 2 in tri-clampNo crank: piston and displacer each hang on a stack of spiral flexures, with a t…You might also need
Questions
What screws hold the flexure clamp plate?
Three M3 through Ø3.4 holes on the rim circle (Ø70.4 for the Ø80 plate).
How thick is the clamp plate?
3 mm.