What Bearings Suit a Shaft with Varying Loads and Diameters?

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Discussion Overview

The discussion focuses on selecting appropriate bearings for a shaft with varying loads and diameters, specifically addressing the calculated loads of 425 N and 375 N at different points on the shaft, along with the shaft diameters of 15 mm and 20 mm.

Discussion Character

  • Technical explanation
  • Exploratory

Main Points Raised

  • One participant mentions the need to select bearings based on calculated loads and shaft diameters.
  • Another participant suggests that large bearing manufacturers provide extensive information on bearing selection, which is accessible online.
  • A different participant highlights that the type and size of bearing depend on factors such as shaft RPM and axial forces, recommending standard deep groove ball bearings for their suitability in various applications.
  • One participant points out that if the shaft rotates slowly, alternative solutions like grease lubricated bronze or Teflon bushings might be considered.
  • A participant shares a resource link for further technical selection data on rolling bearings.

Areas of Agreement / Disagreement

Participants present various considerations for bearing selection, but no consensus is reached on a specific type of bearing or approach, indicating multiple competing views remain.

Contextual Notes

Participants mention factors such as RPM and axial forces that influence bearing selection, but do not resolve how these factors specifically apply to the case at hand.

maths85
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I have to select bearings for the shaft using standard bearings catalogue depending on the calculated load.

In my shaft I calculate the loads and its 425 and 375 N in point A and B.

I should need to choose now what kind of bearings use and also using the diameter of the shaft that its dA=dB= 15 mm. and dC= 20 mm
 
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All the large bearing manufacturers (eg NSK, SKF, NTN) have a huge amount of info on bearing selection. They are available online free, but you may need to make an account (also free).
For a more general introduction, I'd recommend Shigley's Mechanical Engineering Design.
 
Welcome to PF.

The type and size of bearing used is decided by several things. If the shaft rotates continuously then the RPM will be an important specification. Big bearings carry high loads, but only at slower speeds. If the shaft rotates slowly only part of a turn, a grease lubricated bronze or a Teflon bushing might solve the problem.

It is also necessary to identify the axial forces on the shaft. Some bearings can handle end thrust while others cannot. Start looking at low cost commodity bearings such as standard deep groove ball bearings. Usually standardised part numbers 62xx.

Download the Rolling Bearings section from here.
http://www.jp.nsk.com/app01/en/ctrg/index.cgi?gr=bearings
It starts with technical selection data, then goes on to list deep groove ball bearings and many others.
 
Thank you all of you. I found what I need it in the nsk catalogue.
 
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