Guide tecniche e consigli sulla progettazione di molle.
Flat-strip spiral springs: the limits that define a good design
Set torque, turns to solid, space fill and caging risk: the vocabulary of limits that separates a reliable spiral spring from a headache.
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Conical springs don't have a rate: they have a curve
The big coil bottoms first and the spring stiffens with every millimetre. Understand the progressive rate of conical, barrel and hourglass springs, and why a single number misleads.
Two load points, one spring: designing variable pitch without trial and error
Progressive spring specs state two loads at two lengths. Why solving that by hand is a guessing loop, and how a solver hands you the pitch split in one click.
Export the spring at its working length, not just the free state
Your CAD assembly needs the installed spring, not the spring lying on the bench. Why deflected geometry matters and how to export it in one click.
Music Wire vs Stainless Steel: Choosing the Right Spring
Music wire vs stainless steel for springs: compare tensile strength, corrosion, temperature and cost to pick the right spring material with confidence.
Spring Tolerances: A Complete Guide to Fit and Function
Understand spring tolerances: which dimensions are controlled, standards like DIN 2095 and EN 15800, precision grades, and how to specify them correctly on an order.
How to Calculate Spring Deflection: A Practical Guide
Learn how to calculate spring deflection step by step: spring rate, Hooke’s law, a full worked example and the travel limits you must never exceed.
How to Measure a Compression Spring: A Complete Step-by-Step Guide
Learn how to measure a compression spring with a caliper and ruler to reorder or reproduce it exactly. Technical guide with formulas, tolerances and common mistakes.
How to specify a spring to get a quote
A simple guide for non-engineers: see exactly what to provide and how to measure a spring so you get the right price and the correct part.
Music wire, stainless and more: choosing a spring material
A guide to the main spring materials and how to choose based on the application.
Spring rate (spring constant): formula and calculation (Hooke's law)
What the spring rate (k) is, how to calculate it from Hooke's law and the helical spring formula, and how material and dimensions change it.
Spring wind direction: right-hand or left-hand?
A simple, formula-free guide to understanding a spring's wind direction, telling whether it is right-hand or left-hand, and knowing when it actually matters.
Compression, extension, torsion and conical: which spring type?
The differences between the four main spring types and where each one is used.
Compression spring end types: a simple guide
Understand compression spring end types the easy way — open, closed and ground ends — and learn how to pick the best one for your job.
Extension spring: how it works and how to calculate it
What an extension spring is, the role of initial tension, hook types, and how to calculate the force — with a worked example.
How to choose the right spring: a simple 5-question guide
An easy, jargon-free guide to choosing the right spring. Just answer five simple questions about the job, the space, the force, the environment and the quantity.
Spring replacement: when and how to find the right spring
How to spot a worn spring, measure an existing one, and find the correct replacement.
How a spring works
A simple, jargon-free guide to how a spring works: what it does, the three everyday types, why it is made of steel, and where it hides around your home.
Torsion spring: how it works and how to calculate the torque
How a torsion spring works, the torque and angular-rate formula, wind direction, and design cautions.
How to calculate a compression spring
Learn to calculate spring index, spring rate, stress and solid height of a compression spring — with the formulas engineers use.
Shear modulus in springs: why it governs the rate
What the shear modulus (G) is, how it differs from Young's modulus E, why it — not E — sets the rate of compression and extension springs, its values by material and the effect of temperature — with a worked example.
Permanent set in springs: why a spring loses length and load
What permanent set in springs is, the physics of the wire yielding in torsion, the difference between set and relaxation, the presetting process, and the stress limits that prevent loss of free length.
Initial tension in extension springs
What initial tension (F0) is, why only extension springs have it, how to measure it by extrapolation, and how to use it correctly when calculating a spring.
Solid height of a spring: the physical limit of travel
What the solid height of a compression spring is, how to calculate it by end type, how much clearance to leave before coils clash, and how to check the stress at the bottom of travel.
Shear stress in springs: why the wire works in torsion
Understand why the dominant stress in a helical spring is shear, how to apply the Wahl correction, and how to set the allowable stress as a fraction of the material's tensile strength.
Natural Frequency and Surge in Compression Springs: A Complete Guide
Understand the natural frequency of a compression spring, the phenomenon of surge (coil resonance), the governing formulas, the design rule, and how to avoid failures in high-speed applications.
Buckling in compression springs: how to predict and avoid it
Tall compression springs can bow sideways like a slender column. Learn to calculate slenderness, the buckling threshold, the critical deflection and the strategies to prevent it.
Spring Fatigue: How to Design for Long Life Under Cyclic Load
A technical guide to fatigue in helical springs: crack initiation, cyclic stresses, the S-N curve, the Goodman, Gerber and Sines criteria, shot peening, and a fully worked valve-spring example.
Spring Index (C): what it is, the formula and the ideal manufacturing range
Understand the spring index (C = D/d): its definition, the formula, the ideal manufacturing range, the link to the Wahl factor and a full worked example.
The Wahl factor: the real stress inside a spring
Why the inner face of a coil carries far more stress than the torsion formula predicts, how to compute the Wahl factor, and how to use it to design springs that survive fatigue.