Technical Tip
Because of the logarithmic scale on the chart to the left, data for long screws or screws with large diameter may be difficult to read. You may prefer to use this equation…
Please note: The highest permissible load is the minimum of static capacity C0a (to prevent brinelling) and fracture load (to prevent failure of ball nut or bolts). Necessary condition for both is…
Impact of preload
In this step, we modify axial forces to reflect the impact of preload. The preload graph shows how internal forces in the ball nut are affected by external forces and preload…
In this step, we modify axial forces to reflect the impact of preload. The preload graph shows how internal forces in the ball nut are affected by external forces and preload.
The preload graph…
To calculate the impact of actual duty on the fatigue life of the ball screw, it is necessary to convert the varying loads Fi into a mean load Fm which will have the same effect on life as the…
The mean or equivalent load is calculated using the above equation.
qi Time percentage ni Speed (rpm) Fi Thrust (which may need to be modified - due to preload - first)
The service life estimate…
Fm Permissible mean load for a given dynamic load capacity and life
Ca Dynamic load capacity required for a given mean load and life
L10 Fatigue life for a given dynamic load capacity and mean…
According to the ANSI standard, dynamic load capacity of a ball screw is the load under which it will reach a life of 1 million inches of travel. If the lead is smaller than 1 inch, then the load…
Advantages of Steinmeyer ball screws - Accuracy classes and finishing according to customer requirements - Ground and rolled executions available - High quality and long life - Certified processes…
Status Monitoring of Ball Screws
Maintenance can now be anticipated and planned.
Preventative maintenance of machinery and plants on the basis of real-time data is an important new trend.…
