Xem Studiomeasured geometryExtension springs, wire Ø0.6 and Ø1.0
What are the dimensions of a small extension spring with loop ends? · Hardware · basis: Close-wound helical extension spring with a loop at each end; length over the loops
Long Earth Society build part. Pawl returns, diaphragm bias and belt tensioners 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
- 2 in table
Notes
- Close-wound bodies (coils at 1.02 × wire pitch so the turns stay separate) with a full loop each end; the length is over the two loops.
- 0.6 wire × OD 6 (ID 4.8), 30 over the loops, 20 coils; 1.0 wire × OD 10 (ID 8), 50 over the loops, 25 coils.
- Rate follows the same k = G d⁴ / (8 D³ n) as a compression spring, plus an initial tension from close winding; the loop ID is OD − 2 × wire and takes a hook pin.
Sizes
| file | wire Ø | OD | ID | length over loops | coils | index D/d |
|---|---|---|---|---|---|---|
| extension-d0.6-od6-l30 | 0.6 | 6 | 4.8 | 30 | 20 | 9.0 |
| extension-d1-od10-l50 | 1.0 | 10 | 8.0 | 50 | 25 | 9.0 |
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 |
|---|---|---|---|---|
| spring OD | OD (6–16) | pocket of the same Ø | socket | all |
| spring ID | OD − 2 × wire | guide rod or arbor of the same Ø | socket | all |
| loop ID | OD − 2 × wire | hook pin | designed | extension-* |
Where the files are
Other publishers' files are linked, not hosted. "verify" = check the license at the link before commercial use.
| Wikipedia | Spring (device) | web | CC BY-SA 4.0 (text) |
| McMaster-Carr | Compression springs (free STEP per part, for your own design use; no redistribution) | STEP, PDF | McMaster-Carr site terms verify |
| Lee Spring | Spring design formulas | web | Lee Spring site verify |
| Long Earth Society | Engine and rig 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
| extension-d0.6-od6-l30 | extension spring envelope: wire Ø0.6, OD 6, ID 4.8, 30 mm over the loops, 20 coils | STEP · STL |
| extension-d1-od10-l50 | extension spring envelope: wire Ø1.0, OD 10, ID 8, 50 mm over the loops, 25 coils | STEP · STL |
Plain text: sheet.txt · JSON: /api/geometry?object=extension-springs
How it fits
Connects to
GT2 timing pulleys, 16T–60Tbelt tensioner armAlternatives
Compression springs, wire Ø0.5–1.6, OD 6–16pushes instead of pullsYou might also need
Questions
How is an extension spring's length measured?
Over the two loops: 30 and 50 mm on these files.
What is the loop size?
The loop ID is the coil ID: 4.8 on the 0.6 × 6, 8.0 on the 1.0 × 10.