×
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!

*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

Frictionless Axis of rotation

Frictionless Axis of rotation

Frictionless Axis of rotation

(OP)
I want to analyse the force required to compress a spring, the lever has a 'frictionless' pin at the bottom, to rotate around and the spring at the top.

When I analyse the lever bends around the axis(assumes 100% friction) - how can I get it to rotate around the pin freely?

thanks

RE: Frictionless Axis of rotation

Assuming you are using solid elements (blue) to mesh the model as opposed to shell elements, create a rotational constraint by first creating a cylindrical coordinate system in mechanical located at the axis of your pin hole.

Next, create a constraint, but change the coordinate system reference to the newly created cylindrical csys.  You should now have new constraint options r, theta, and z.  My guess is that you would pin r and z and free theta.

Good luck,

Steve

 

RE: Frictionless Axis of rotation

(OP)
cool - worked straight off....spent a whole day yesterday trying and knew I was missing a trick....thanks.

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



News


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