• Wear Equations

    Posted August 22, 2019 - Updated Dec 4, 2019

    Wear Equations As discussed earlier, estimating the service life of Power Screw systems is a very complex task and inexact at best. The only reliable predictor is actual testing. Variations in service life are widely scattered and multiples of two to one or three to one in life test performance are not uncommon. The field […]

  • Monitoring Wear

    Posted August 22, 2019 - Updated Dec 4, 2019

    Wear Life Testing Methods As mentioned before the best method of assessing the performance and life of Power Screws and nuts is actual field testing. This may present difficulties because of time constraints so accelerated lab testing is often conducted instead. When monitoring wear, all lab testing should monitor drive torque and nut temperature along […]

  • Screw and Nut Material Selection

    Posted August 22, 2019 - Updated Dec 4, 2019

    Screw and Nut Material Selection To reduce the costs of wear in Power Screw systems, we recommend designs where nuts are made of softer material and screws of a harder material. This ensures that the nuts will wear and the screw will remain relatively wear-free, which is desirable because replacement nuts are usually much less […]

  • Wear Mechanism

    Posted August 22, 2019 - Updated Dec 4, 2019

    Wear Mechanism The study of wear is a field called tribology. There is much research on the subject, but little definitive work that can help determine the wear rate of two surfaces in any specific application. The wear mechanism itself is simple to understand. With reference to Figure 38, two rubbing surfaces contact only at […]

  • Screw Wear Life

    Posted August 22, 2019 - Updated Dec 4, 2019

    What is a Screw Wear Life The wear life of Power Screw and nut drive systems are difficult to predict theoretically. The number of variables involved in such a prediction is large; load, speed, screw material, nut material, surface finishes, lubrication, duty cycle, operating temperature, and environmental factors such as the presence of abrasive contaminants, […]