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Crankshafts Ø3, Ø5 and Ø8 with full-length D-flat
What crankshaft sizes fit the 623, 625 and 608 bearings on a model Stirling engine? · Hardware · basis: Solid shafts at the 623 / 625 / 608 bore Ø; Ø5 and Ø8 with a 0.5 mm D-flat along the whole length
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
- 11 in table
Notes
- Solid round shafts with 0.3 chamfers on both ends. Ø3 × 40, 44, 60 and 80 are plain round; Ø5 × 80, 100, 120, 150 and Ø8 × 80, 100, 120 have a D-flat 0.5 deep along the whole length (4.5 and 7.5 across the flat).
- The flat is where the M3 grubs in crank discs, webs and flywheel hubs bear, so the hubs cannot turn on the shaft. It also gives the shaft a flat face to lie on.
- Ø3: the crank head's 623 towers and the Ø3-bore crank discs. Ø5: the 625 crank stands, rhombic gears, crank discs and Ø5 flywheel hubs. Ø8: the tri-clamp crank frame's 608s, crank webs and Ø8 flywheel hubs.
- Lengths on the engines here: 2 in gamma Ø5 × 100 between two 625 stands with the flywheel outside; tri-clamp crank frame Ø8 × 80; rhombic gear shafts Ø5 × 80, one × 120 to carry the flywheel; can engine Ø3 × 44 and LTD Ø3 × 40 (a crank disc at each end, bearings and flywheel between).
Sizes
| file | Ø | length | D-flat | fits |
|---|---|---|---|---|
| crankshaft-3x40 | 3 | 40 | — | 623; crank-disc-b3 |
| crankshaft-3x44 | 3 | 44 | — | 623; crank-disc-b3 |
| crankshaft-3x60 | 3 | 60 | — | 623; crank-disc-b3 |
| crankshaft-3x80 | 3 | 80 | — | 623; crank-disc-b3 |
| crankshaft-5x80-dflat | 5 | 80 | 0.5 full length (4.5) | 625; crank discs; Ø5 hubs |
| crankshaft-5x100-dflat | 5 | 100 | 0.5 full length (4.5) | 625; crank discs; Ø5 hubs |
| crankshaft-5x120-dflat | 5 | 120 | 0.5 full length (4.5) | 625; crank discs; Ø5 hubs |
| crankshaft-5x150-dflat | 5 | 150 | 0.5 full length (4.5) | 625; crank discs; Ø5 hubs |
| crankshaft-8x80-dflat | 8 | 80 | 0.5 full length (7.5) | 608; crank webs; Ø8 hubs |
| crankshaft-8x100-dflat | 8 | 100 | 0.5 full length (7.5) | 608; crank webs; Ø8 hubs |
| crankshaft-8x120-dflat | 8 | 120 | 0.5 full length (7.5) | 608; crank webs; Ø8 hubs |
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 |
| D-flat | 0.5 deep | M3 grubs in hubs | designed | crankshaft-* |
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 11 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| crankshaft-3x40 | Ø3 × 40 solid crankshaft for the crank head's 623 towers and the Ø3-bore crank discs; can engine skewer replacement | STEP · STL |
| crankshaft-3x44 | Ø3 × 44 solid crankshaft for the crank head's 623 towers and the Ø3-bore crank discs; can engine skewer replacement | STEP · STL |
| crankshaft-3x60 | Ø3 × 60 solid crankshaft for the crank head's 623 towers and the Ø3-bore crank discs; can engine skewer replacement | STEP · STL |
| crankshaft-3x80 | Ø3 × 80 solid crankshaft for the crank head's 623 towers and the Ø3-bore crank discs; can engine skewer replacement | STEP · STL |
| crankshaft-5x80-dflat | Ø5 × 80 crankshaft with a full-length 0.5 mm D-flat (4.5 across) for the grubs; 625 crank stands, rhombic gears, crank discs, nut flywheel b5. | STEP · STL |
| crankshaft-5x100-dflat | Ø5 × 100 crankshaft with a full-length 0.5 mm D-flat (4.5 across) for the grubs; 625 crank stands, rhombic gears, crank discs, nut flywheel b5. | STEP · STL |
| crankshaft-5x120-dflat | Ø5 × 120 crankshaft with a full-length 0.5 mm D-flat (4.5 across) for the grubs; 625 crank stands, rhombic gears, crank discs, nut flywheel b5. | STEP · STL |
| crankshaft-5x150-dflat | Ø5 × 150 crankshaft with a full-length 0.5 mm D-flat (4.5 across) for the grubs; 625 crank stands, rhombic gears, crank discs, nut flywheel b5. | STEP · STL |
| crankshaft-8x80-dflat | Ø8 × 80 crankshaft with a full-length 0.5 mm D-flat (7.5 across); tri-clamp crank frame 608s, crank webs, flywheels b8. | STEP · STL |
| crankshaft-8x100-dflat | Ø8 × 100 crankshaft with a full-length 0.5 mm D-flat (7.5 across); tri-clamp crank frame 608s, crank webs, flywheels b8. | STEP · STL |
| crankshaft-8x120-dflat | Ø8 × 120 crankshaft with a full-length 0.5 mm D-flat (7.5 across); tri-clamp crank frame 608s, crank webs, flywheels b8. | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=stirling-crankshafts
How it fits
Parts that fit it
Scotch yokecrank disc on a Ø5 shaft
Geneva driveØ5 shafts for wheel and drive
Spoked flywheels Ø50 to Ø150 × 10Ø5 / Ø8 bore, M3 grub on the flat
Counterweighted crank discs, Ø5 bore, 10 to 30 mm…Ø5 bore, M3 grub on the flat
Crank webs, Ø5 bore, 10 to 30 mm strokeØ5 bore, M3 grub
Shaft adapter Ø5 to Ø8 × 20Ø5 bore on the D-flat shaft
Crank discs Ø30 for a Ø3 crankshaft, 10 to 20 mm…Ø3 crankshaft in the boreGoes in or on
Crank stands with a 625 pocket, 40 and 60 mm axis…Ø5 shaft in the stands' 625s
Tri-clamp power pistonØ8 shaft in the crank frame's 608sConnects to
Crank discs for a Ø5 shaft, 10 to 30 mm strokeØ5 bore, M3 grub on the flat
Flywheels Ø100–Ø200 with hex-nut rim pocketsØ3 / Ø5 / Ø8 hub, M3 grub on the flatAlso needed
Shaft spacers for Ø3, Ø5 and Ø8 shafts, 1 to 5 mmset the 1 mm gaps along the shaft
Ball bearings, 683 to 6210 and flanged F6xx623 / 625 / 608In these build lists
Gamma Stirling, 2 in tri-clampHot spool with a shell displacer, a crank head that carries the crankshaft, the …Soda-can gammaA 12 oz can as the displacer cylinder over a tea light, a 10 mL syringe barrel a…Beta Stirling, rhombic drive, 2 in tri-clampDisplacer and piston in one bore, driven by two counter-rotating gears on a rhom…LTD coffee-cup engineRuns on a cup of coffee: wide thin displacer, small piston.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…Tri-clamp tee diaphragm gamma, 2 inA tea-light gamma in 2 in tri-clamp: displacer in a 3 in spool, a short-outlet t…Tri-clamp elbow diaphragm alpha, 2 inA torch-heated alpha in 2 in tri-clamp: a square of fittings with a diaphragm he…Test-tube marble enginecrank and flywheel at the end.You might also need
Questions
What diameter crankshaft does a model Stirling engine need?
The bore of its bearings: Ø3 in 623s, Ø5 in 625s, Ø8 in 608s. The Ø5 and Ø8 files carry a 0.5 mm D-flat along their whole length.
Why a D-flat?
So the M3 grub in each crank disc, web and flywheel hub bears on a flat and the hub cannot slip round the shaft.
How is this different from the metric shafts page?
Those have a 20 mm motor-style flat 0.1 × d deep at one end; these have a 0.5 mm flat along the whole length so a hub can sit anywhere.