×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

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!
  • Students Click Here

*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

Jobs

off set bearing loads

off set bearing loads

off set bearing loads

(OP)
Hello, Trying to size a bearing/s  that can take an offset loads.   Approximately 5000 lbs @ 131 inchs & 2500 lbs @ 9 in away from first bearing or pair.  Bearings are mounted vertically.
I am allowed 1mm deflection and speed is very slow 5 rmp. Smallest bore the better.
We also might add counter weight on opp. side(lower) for safety,
I think this is a simple calc but would love assistance.

RE: off set bearing loads

what is the spacing between the bearings?

 

RE: off set bearing loads

(OP)
Thanks for asking.

Spacing between the bearing is 80 in but can increase some if needed.

RE: off set bearing loads

I would consider a slewing ring bearing, like Rotek, as an alternative to shaft and bearings.

http://www.rotek-inc.com/files/Rotek_84pgCat_FINAL_ViewOnly.pdf

Yours is a fairly serious application that really should have a responsible party in charge.

Caution about counterweight increasing the mass moment of inertia to the point where starting and stopping the load becomes an issue.

RE: off set bearing loads

swcaddesigner,

If the direction your loads are applied is fixed with respect to rotation, then your bearing system must be able handle radial forces and moments.  With your offset loading condition the bearings will be different sizes if you want to optimize the system.

As for maximizing mounting stiffness with minimum bearing diameters, your best bet is probably a pair of tapered roller bearings with preload.

Good luck.
Terry

RE: off set bearing loads

(OP)
Thanks. I have been checking out the Rotek Slewing Bearing and thier engineering assistance.  I am doing a first rough pass but will employ a PE with Cosomos experience soon.
Thanks for the advise on counter weighting.

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!


Resources