IPPT
30,000,000 × d⁴ / (10.2 × (ID + d) × N)Inch-pounds per turn from wire diameter, inside diameter, and active coils.
Spring Calculator
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Assembly load—in-lb MIP
Turns—on springs
IPPT—in-lb / turn
Calculated life—cycles
Safeway spring selection
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| Configuration | Springs | Stock code | Turns | IPPT | Sell | Status |
|---|---|---|---|---|---|---|
| No calculation yet | ||||||
Suggested BOM note—
Engineering detail (theoretical)
Complete the setup and calculate.
| Position | Wire | I.D. | Length | Weight | Cycles |
|---|---|---|---|---|---|
| No calculation yet | |||||
Torque multiplier—
Torsion assembly width—
Selected drum—
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Drum limits
- Maximum door height
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- Maximum door weight
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- Maximum cable diameter
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- Drum status
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Working moment
turns × IPPTMoment in inch-pounds at the selected number of working turns.
Cycle estimate
(d²·⁷⁹ × 159,000 × 1.815 / 10.2 / MIP)⁴·⁶⁷ × 1,000Estimated cycle life at the working moment.
Wire weight
π × (d / 2)² × 12 × 0.2836Wire weight per foot using the embedded steel-density constant.
Linear wire
total coils × (ID + d) × πTotal wire length used to determine spring weight.
High-lift moment arm
√(flat arm² + rate of rise × high lift / π)High moment arm for a high-lift drum configuration.