The heart of the Wedgegard products is the Wedgepin
We have invested significantly in custom built static and dynamic test rigs to ensure that the Wedgepins break at their rated torque and within tolerance. This gives customers confidence in Howdon Wedgegard products.
Different batches of the same grade material vary in tensile strength within the grade’s band. For example the grade of brass we use in our Wedgepins is CW712R (CZ112) Naval Brass. This for example has a tensile strength of between 340 and 400 mPa. Traditional round shear pins are mass produced with a fixed neck diameter. This means that if not tested each batch of shear pins could have large variations in breaking/shear torque. Our test department can test both statically and dynamically to take into account the differing material tensile strength, determining the correct Wedgepin neck diameters required. Therefore ensuring continuity of breaking torque between batches. Howdon state a tolerance of between ±10% and ±15% but in reality when checking, most pins are within 5%. We have full tracebility of the materials used in each batch of Wedgepins to ensure this happens.
The dynamic test rig has a disc brake and pneumatically actuated thruster which is pulsed to simulate loading on the Wedgepins. Both braking force and pulse frequency can be adjusted to simulate peak and intermittent loading, determining the fatigue life of the pins. This is something unique to Howdon and demonstrates our commitment to continuous improvement and new developments.
Howdon is committed to testing the materials we use, combined with using state of the art 3D CAD software and CNC manufacturing, ensures that our Wedgepins are made to the highest standards.