×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Question about O mounting

Question about O mounting

Question about O mounting

(OP)
Hi,
In my memories there's the information that in a O shaped mounting, the bearings will work in diagonal (the forces will be transmitted following that path).
But in many drawings I can see the presence of a spacer between internal rings. Is it necessary since no force should be transmitted to it?

RE: Question about O mounting

https://www.bearing.co.il/img/tech1/PDF/NSK_CAT_E1...

Take a look at the images in the 10.2.2 paragraph. Notice also how the bearings have a support in the corners where the force transmits itself.

A spacer would help with the preload,ut in your case it would need to be placed on the upper part if I'm not wrong.
(Edit- or, you can put a spacer on the lower part that goes around the outside instead of the inside)

RE: Question about O mounting

The overall length of the inner spacer as compared to the length of the outer spacer determines the bearing preload. Without the inner spacer, the bearing would be severely overloaded when the shaft nut was properly tightened. Without the inner spacer, it would be impossible to tighten the shaft nut to the perfect amount to preload the bearing. But, the length of the inner spacer can be changed in 0.0001" increments to provide the exact pre-load desired.

Johnny Pellin

RE: Question about O mounting

"in many drawings I can see the presence of a spacer between internal rings."


Understanding the applications for the components shown in each of those drawings would very likely help shed some light.

Machine tool spindle - stiffness is supreme - "rigid preload" using JJPellin's spacers is VERY common. 15° and 25° angular contact perhaps more common than industrial 40° angular contact bearings used on more mundane equipment making two bearings handle radial and axial loads.

In the old day angular contact ball front wheel bearings were common. They look pretty steep.
http://chevy.oldcarmanualproject.com/shop/1955/ima...

But many or most mfrs evolved to the vastly superior ( IMO )taper rollers, only to devolve in the modern era to assembly friendly wheel bearing cartridges. I'm not sure what contact angle may be common in those.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close