Helical Torsion Spring Torque Testing

Requirement

Spring-loaded components are used extensively in home and consumer goods: clothes pegs, clips and old-fashioned mousetraps; small doors and flaps on cameras or hi-fi equipment; large doors and closures such as those on garages or gates and in transport applications like vehicle luggage compartments.

Despite being termed ‘torsion’, and operating under torque loading, the spring itself is subjected to a bending stress when the ends rotate about its central axis, driven by the components attached to either arm (or leg).

The parts of an assembly, which are required to rotate in service, depend greatly upon the spring’s stiffness rating. This determines if the assembly is fit for purpose and exhibits the correct level of resistance for ease of operation and quality feel.

Solution

A motor-driven test stand controlled by software rotates the spring to a pre-defined angle and collects the torque and angular displacement data continuously. The software ensures repeatable testing in clockwise or anti-clockwise directions and protects against a permanent set in the spring material.

Approaching the target load point from below and above, then averaging, minimises the effect of friction and hysteresis on the results caused by the contact between the spring coils.

The requirement to lie within specific torque range limits - when rotating the spring within its linear, elastic region - is immediately visible to operators through a clear PASS/FAIL indication. 

In the smallest of torsion springs, used in precision applications, the frictional forces experienced by the coils may be highly significant. The need is greatest to employ a test system which not only ensures that the spring’s axis remains aligned to within tight tolerances but accurately measures the resulting very light torque values.

Test equipment

  • Helixa-i precision automated torque tester

Helixa-iPrecision automated torque tester

PC-driven
Helixa-i

The Helixa-i is a top of the range torque tester controlled by software running on a PC. Designed for precision torque applications where torque forces may be very small and accuracy is the priority.

With a wide range of precision fixtures, the Helixa-i is easy to use and optimised for measuring torque from as little as 1 mN.m right up to 6 N.m.

Helixa-i precision automated torque testing system
Console-driven
Helixa-xt

The Helixa-xt is a top of the range torque tester controlled by a touchscreen console. Designed for precision torque applications where torque forces may be very small and accuracy is the priority.

With a wide range of precision fixtures, the Helixa-i is easy to use and optimised for measuring torque from as little as 1 mN.m right up to 6 N.m.

Helixa-xt console-driven automated torque testing system

The Helixa-i is a precision torque tester controlled by software running on a PC. Designed for precision torque applications where torque forces may be very small and accuracy the priority.

With a wide range of precision fixtures, the Helixa-i is easy to use and optimised for measuring torque from 1 mN.m to 6 N.m.

 

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