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Question about J1 tapered roller bearings

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Avatar of Daniel Gigliotti
(@danielgigliotti)
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Joined: 3 weeks ago
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Hi there, I'm new here.
I was just looking into AR4 and following some build log on youtube. I noticed that two tapered roller bearings are used for joint 1. Some time ago I researched this for a personal project and read that a certain type of preload must be applied to tapered roller bearings in back-to-back or face-to-face configurations (as well as to all other types of bearings). I just wanted to ask out of curiosity if the preload in this case is guaranteed by the tight tolerance of the machined pieces or if it is not always necessary. I just want to understand and to, hopefully, become a better engineer.

Thank you!



   
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Chris Annin
(@chris-annin)
Member Admin
Joined: 3 months ago
Posts: 538
 

Hello,  In the build manual page 67 shows tightening the tension screws that apply bearing preload.  Please let me know if you have any questions on that.  -Chris



   
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Avatar of Daniel Gigliotti
(@danielgigliotti)
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Topic starter  

@chris-annin So there is a small gap between the two components and tightening the screws brings them closer?



   
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Chris Annin
(@chris-annin)
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Joined: 3 months ago
Posts: 538
 

@danielgigliotti99-dggmail-com no the screws place direct pressure on the bearing center housing and preload the bearings.  Im attaching a section view.



   
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Avatar of Daniel Gigliotti
(@danielgigliotti)
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Joined: 3 weeks ago
Posts: 3
Topic starter  

@chris-annin Ok got it, thanks. This is very nice. Just out of curiosity, if I were to do something like this with a different material, for example PLA + heat set inserts, it wouldn't work because the tension of the screws will deform the plastic rather than preload the bearing, right?



   
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Chris Annin
(@chris-annin)
Member Admin
Joined: 3 months ago
Posts: 538
 

@danielgigliotti99-dggmail-com I would use PETG but it should work fine - its not that much pressure to preload.



   
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