How to attach bearings on shaft

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Discussion Overview

The discussion revolves around the methods for attaching bearings to a shaft that is intended to rotate back and forth. Participants explore various approaches to ensure proper attachment and support for the shaft's movement, considering factors such as load and shaft design.

Discussion Character

  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant suggests using two slide bearings, positioned on the top and bottom of the shaft, to allow for rotation, while seeking advice on vertical movement stabilization.
  • Another participant notes that the middle portion of the shaft could be thicker than the top and bottom portions, prompting further inquiry on how to implement this design.
  • A suggestion is made that if there is no axial load, external circlips could be used for bearing attachment.
  • Another participant proposes looking at the mechanics of a bicycle crank for insights, mentioning that some shafts are designed to be frozen and then heated for a tight fit in bearings, or alternatively, press-fitted.
  • It is mentioned that if the shaft bears axial force, it should have a shoulder to support the bearing, which would bear the load of the entire shaft.
  • A recommendation is made to consult books that illustrate gearbox structures for additional guidance.

Areas of Agreement / Disagreement

Participants express differing views on the best methods for attaching bearings, with no consensus reached on a single approach. Multiple competing ideas regarding shaft design and bearing attachment techniques remain present.

Contextual Notes

Participants have not fully resolved the implications of axial loads on bearing attachment and the specific design choices for the shaft's diameter variations.

Blad9
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I have a shaft, which I would like to rotate 90 degrees to one side and then 90 degrees back to the other side and so forth. How should I attach the bearings to this shaft? I was thinking to do it as shown in this image:
wl4tj9.jpg

Two slide bearings, one on the top and one on the bottom so the shaft can rotate. But how should I fix this movement vertically? I’m completely new to attaching bearings on shafts, so any help would be appreciated. It does not necessarily have to be done as shown in the image.
 
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The shaft at the middle portion can be thicker in diameter than the top and bottom portion.
 
cktoh said:
The shaft at the middle portion can be thicker in diameter than the top and bottom portion.
Yes, true. Didn't think about that. But how should I realize that?
 
If there is no axial load, you can use external circlips
 
if there is a load, perhaps you could look at the workings of a crank on a bicycle. Are you attaching anything to each end of the shaft? some shafts are frozen (reduced in size) then feed into the bearing and gradually heated to create a mate through expansion of metal, or you can have them press fitted.

Hope this helps.

Dunk
 
if you need the shaft bears axial force, the shaft must have a shoulder, one bearing leans against the shoulder, it can support whole shaft.
i suggest you refer to some books show a few structure inside gear box, it is useful for you.
 

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