Bearing requirements calculation

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SUMMARY

The discussion focuses on calculating bearing requirements for a design project, emphasizing the need for high accuracy in the presence of small loads. The user seeks to determine if all loadings can be assumed to apply to the bearing and whether the bearing stiffness can be calculated using the formula 10N/0.01mm = 1000N/mm, given a total radial loading of 10N and an accuracy requirement of 0.01 mm. The SKF bearing selection process is recommended as a resource for further understanding.

PREREQUISITES
  • Understanding of bearing stiffness calculations
  • Familiarity with load types: moment, force, and gravity
  • Knowledge of precision bearing specifications
  • Basic principles of mechanical design and accuracy requirements
NEXT STEPS
  • Review SKF's bearing selection process for super precision bearings
  • Study the impact of load types on bearing performance
  • Learn about calculating bearing stiffness in mechanical systems
  • Explore design diagrams for mechanical systems to enhance clarity in load distribution
USEFUL FOR

Mechanical engineers, design engineers, and anyone involved in selecting bearings for high-precision applications will benefit from this discussion.

jianan
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TL;DR
I am looking for bearings. I have all the loads on the shaft, so how do I calculate the stiffness and other bearing requirements?
Hi!
I am working on a design project. I already know all the loads (moment, force and gravity) on the shaft. I want to calculate the bearing requirements to help me choose the right bearing. All loads are very small, and the key requirement of the entire system is high accuracy.
Can I assume that all the loadings apply to bearing, then bearing need to be able to handle all the loadings and also maintain accuracy?
For example, if the total radial loading on the shaft is 10N and need accuracy of 0.01 mm for system. Can I say that the requirement of bearing stiffness is 10N/0.01mm = 1000N/mm?
 
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A system diagram would make your questions much more meaningful.
 

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