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Hermans Verenfabriek

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Torque Measurements and Lifetime Tests for Torsion and Garage Door Springs

At the Hermans Spring Factory measurement lab, we heavily invest in optical measurement devices. We use three Keyence units and a Mitutoyo system for highly precise, contactless measurements of springs, stamped parts, and sheet metal components. This technology enables the fast and reliable inspection of shapes, dimensions, angles, and tolerances without the risk of product deformation.

What are optical measurement instruments?

Optical measuring devices use advanced image processing and light projection to visually scan and analyze components. These machines convert images into measurement data with micrometer-level precision. Because these measurements are completely contactless, they are ideal for delicate or complex shapes.

What are they used for?

These systems are primarily used for:

  • Shape and dimension control down to micron level
  • Comparison with CAD drawings or reference parts
  • Detection of deviations or wear
  • First article inspection, in-process control, and final inspection
  • Perfectly suited for both large and small production runs

Our measurement capabilities:

  • Accuracy up to ± 1 µm
  • Detection of complex shapes and contours
  • Measurement of components up to approximately 200 mm in width and length, depending on product shape and type
Hermans Veren

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Compression and Tensile Force Measurements for Functional Control and Lifetime Testing

Within the measurement lab at Hermans Spring Factory, we have advanced setups and various machines at our disposal – including two Microstudio devices, our Shimadzu, and of course our PCM 500. These are used to analyze compression and tensile forces in the finest detail. These tests are the core of the functional quality control of our springs, wire products, and sheet metal components. They simulate realistic load conditions and ensure that every part can withstand the required forces and fatigue cycles.

What are compression and tensile force measurements?

This type of measurement examines how a material or product behaves under axial load – either in compression or in tension. Force, deformation, spring constant, and fatigue are all accurately recorded. The results provide a reliable picture of the mechanical properties of a component.

What are these measurements used for?

These tests are essential for:

  • Determining the actual force-displacement characteristics of springs
  • Checking the elastic and plastic limits
  • Qualifying tensile strength and fatigue behavior
  • Simulating real-world applications under actual loads

Our measurement capabilities:

  • Force measurements from a few grams to 100,000 N (!)
  • Stroke measurements up to 1400 mm
  • Real-time analysis of force versus displacement
  • Continuous data logging and comparison with standards or reference curves

Lifetime and Cycle Testing

Thanks to our cycle test setup, we can perform lifetime tests in which parts are subjected to loads for thousands to hundreds of thousands of cycles. This is crucial for applications where fatigue or metal fatigue is a factor. The evolution of forces and displacements is monitored to detect performance loss in time.

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Torque Measurements and Lifetime Tests for Torsion and Garage Door Springs

For torsion and garage door springs, we perform highly accurate torque measurements in our measurement lab. For this purpose, we use our Microstudio and HST, with special mention to our SAS-T-200 HS. This system allows us to measure even the largest and heaviest garage door springs. These measurements analyze the torque of a spring at a given angle of twist and are essential to ensure proper operation.

What is a torque measurement?

A torque measurement determines how much force (torque or torsion) is required to twist a spring by a certain angle. This measurement is specific to torsion springs, which do not change in length like compression or tension springs but produce a rotational movement. Torque versus angle is recorded and analyzed with precision.

What are these measurements used for?

Torque measurements are critical for:

  • Functional testing of torsion and garage door springs
  • Verifying torque values
  • Comparing with calculated or required specifications

Our measurement capabilities:

  • Torque measurements up to 200 Nm
  • Angle twist analysis up to 360° and beyond
  • Detailed torque-angle graphing

Lifetime Tests for Torsion and Garage Door Springs

For springs that need to repeatedly open and close – such as (heavy) garage door springs – we conduct cyclic fatigue tests. During these tests, thousands of open/close movements are simulated, with continuous torque monitoring. This allows us to detect early wear or loss of spring force and improve the design if needed.

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Hardness Testing for Reliable Material Verification

At the Hermans Spring Factory measurement lab, we perform hardness tests to determine the resistance of materials to indentation and deformation. For this, we use the Affri System and our Hardness Tester. These tests are a vital part of our quality control, both during production and during final inspection of our own tooling (small machine parts and dies), stamped parts, and other metal components. Hardness is a key indicator of wear resistance, strength, and service life.

What is a hardness test?

A hardness test determines how well a material resists permanent deformation from an indentation. Depending on the application, a specific method is chosen, such as Rockwell (HRA to HRM) or Vickers (HV10, HV60, HV100). Each method is suited to a specific material type, thickness, or hardness level.

What are these tests used for?

Hardness tests are used to:

  • Verify material quality
  • Check heat treatments or surface hardening
  • Determine whether a material is suitable for spring loads
  • Compare with material specifications or customer requirements

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