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Plunger clevis for a glass syringe: cap over the piston collar with a con-rod fork
How do I connect a crank to a glass syringe plunger? · Hardware · basis: My geometry, drawn to the glass syringe's published piston collar (KD Scientific / Tomopal: 5 mL Ø17.25, 10 mL Ø19.95); fork sized for the 5 mm thick pin-end con-rods
Long Earth Society build part. Joins a glass plunger to the crank on the mug LTD and the marble engine. 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
- 2 in table
Notes
- The cap's pocket is the piston collar's published diameter, exactly (5 mL Ø17.25, 10 mL Ø19.95), 3 deep (the collar thickness drawn on the plunger file; the datasheet gives no thickness). One M3 grub (set-m3x3) in a Ø2.5 tapped hole reaches the collar's edge; the cap's top face pushes on the collar.
- Fork: 12 × 12 block, 5 mm slot for a 5 mm con-rod, Ø3 pin hole 12 above the collar underside, for a dowel-3x12 (flush both sides).
- Used on the mug LTD and the test-tube marble engine (5 mL).
Sizes
| part | pocket_mm | body_mm | pin_above_collar_mm | pin |
|---|---|---|---|---|
| plunger-clevis-glass-5ml | 17.25 | 23.25 | 12.0 | Ø3 (dowel-3x12) |
| plunger-clevis-glass-10ml | 19.95 | 25.95 | 12.0 | Ø3 (dowel-3x12) |
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 |
|---|---|---|---|---|
| collar pocket | Ø17.25 × 3 (5 mL) / Ø19.95 × 3 (10 mL) | glass piston collar | slide | plunger-clevis-* |
| grub hole | Ø2.5 (M3 tapped) | set-m3x3 | designed | plunger-clevis-* |
| fork slot | 5 | 5 mm con-rod | run | plunger-clevis-* |
| pin hole | Ø3 | dowel-3x12 | press | plunger-clevis-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| KD Scientific | Full Line of Glass Syringes, rev. A (order codes 78-0871 to 78-0880): piston OD, barrel OD D1, barrel collar D2, piston collar D3, length L | manufacturer datasheet verify | |
| Long Earth Society | Engine builds | web, video | LES site |
Free files
★ Free files 2 parts. Generated by Xem Studio from the standard; threads are plain cylinders at major diameter. CC BY 4.0. index.json
| plunger-clevis-glass-5ml | cap for the 5 mL glass plunger: Ø17.25 × 3 pocket (the piston collar, exact), Ø23.25 body, M3 tapped (Ø2.5) grub to the collar edge, 12 × 12 fork with a 5 mm slot and a Ø3 pin hole 12 above the collar's underside | STEP · STL |
| plunger-clevis-glass-10ml | cap for the 10 mL glass plunger: Ø19.95 × 3 pocket (the piston collar, exact), Ø25.95 body, M3 tapped (Ø2.5) grub to the collar edge, 12 × 12 fork with a 5 mm slot and a Ø3 pin hole 12 above the collar's underside | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=glass-syringe-plunger-clevis
How it fits
In these build lists
Mug LTD (sits on a coffee mug)Test-tube marble enginecrank and flywheel at the end.You might also need
Questions
How does the con-rod attach to a glass syringe plunger?
Through this cap: it sits over the plunger's collar (pocket at the collar's exact Ø), an M3 grub holds it, and a Ø3 pin through its fork carries the con-rod's small end.