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

Force required to fit bearing

Force required to fit bearing

Force required to fit bearing

I know that asking for an accurate formula for the force required to fit a bearing onto a shaft (or a shaft into a bearing) is like asking for a three-word solution to Fermat's Last Theorem, so I am not going to ask for one. thumbsup2 However, if there is someone practiced in such Black Arts who can seriously suggest a Ball-park figure for the Force (in Newtons) required to press a 32 mm single-race ball bearing onto a shaft, I would be really appreciative. bow


Artificial Intelligence is no match for Natural Stupidity

RE: Force required to fit bearing

Hi vagulus,

You have provided precious little info to start.

Do you know what the shaft diameter is within 0.0002 inch or so?
Note "is" is not the same as what appears on the shaft drawing.
And how round the shaft is, especially if it is a centerless ground part.

What do you know about the design of the machine?
IF the shaft is stationary a slight amount of clearance and a slip fit MAY be just fine.
If the shaft rotates, like the rotor of an electric motor, some amount of interference is likely required.
Depending on the application the bearing may require greater than standard internal clearance lest it become too tight when the inner race is expanded by the tight fitting shaft ( or outer race by the housing) or if the shaft runs hot, like an electric motor.
There needs to be another bearing on the shaft somewhere. How is thermal growth accomadated?

For typical applications a light drive fit, or maybe a few hundred pounds of force would suffice.
As would heating the bearing on a 100W incandescent light bulb for 15 minutes or so.

pages 13 to 14 here -

RE: Force required to fit bearing

Thanks for that. (That Skefco Manual will come in handy thanks)

Artificial Intelligence is no match for Natural Stupidity

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


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