Power Spring Calculator

Strip spring / motor spring design with torque profile designer

YELLOW

Strip spring / motor spring with torque profile designer

Load Preset

Geometry

Thickness t (mm)

Width b (mm)

L (length) opt

Di (inner dia)

Do (outer dia)

Direction

Material

μ (friction)

Shot Peened

E = 205,000 MPaSy = 1200 MPaSu = 1650 MPa

Operating Temp25°C

Thermal Relaxation: 2.0% stiffness reduction

Environment

Assembly

N₀ (pre-turns)

N (working turns)

Max Limit opt

Winding80%

Arbor OnlyFully Wound

Type: Power Spring / CW

t=0.3 b=12 L=414.7

Di=8 Do=25

3D Preview (Rigorous)P1 Model

Summary

YELLOW

Torque Range

150 -150 N·mm

Working Turns

5 / 28

Min Bend Radius

4.0 mm (req: 1.5)

Safety Factor (Yield)

1.44

Fatigue Rating

infinite

Max Stress

833 MPa

Max Stored Energy

4712 N·mm

Material

SAE 1074/1075

ASTM A684

205,000 MPa

1200 MPa

1650 MPa

Se'

825 MPa

Envelope Governancev1.0 Advisory

PASS

Travel Utilization

50.0%

1800.0 / 3600.0 mm

Force Deviation

0.0%

Nominal: 150.00 N

Life Governancev1.0 Advisory

MARGINAL

Target Cycles

N/A

Catalog Cycles

15,000

Data Assumptions:

lifeCycleDataMissing_cannotVerify

Life Model:

Life is cycle-dependent, not time-dependent.

Assembly Governancev1.0 Advisory

WARN

Assembly MethodSingle

Detected Risks:

SIDE_GUIDE_REQUIRED

Travel is large, side guide recommended

SIDE_PLAY_NOT_SPECIFIED

Side play not specified, recommended to provide

Assumptions:

sidePlayNotSpecified_cannotVerifyClearance

k150.00

C 1.44

SF 1.44