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


Using runout on threaded feature?

Using runout on threaded feature?

Using runout on threaded feature?

I was asked to review a dwg that uses runout to control a threaded feature.

This is not something I've ever seen before and can't find any use cases where runout is the proper control to use. Is there a case where you'd want to use runout on a threaded feature? If not, what's the argument against it? I would assume you want to control pitch diameter and runout would only control major diameter? How would you inspect this callout?


RE: Using runout on threaded feature?

Q: How would you inspect this callout?
A: I would make a fixture that holds the part and has a cylindrical track that is parallel to the axis of rotation with an arm that lies across the screw thread and has a wire that touches the thread at the pitch diameter. As the part is turned the wire follows the thread and pulls the arm along the track. A dial indicator is placed at the other end of the arm and rides on another track that is also parallel to the axis of rotation. The variation in the dial indicator reading is scaled to the account for the ratio of distances from the cylinder to the screw thread and to the dial indicator.

RE: Using runout on threaded feature?

Sounds like a complicated setup... do you know of any reason you'd want to call out a threaded feature this way?

RE: Using runout on threaded feature?

I hope it's because there's a need for it. I haven't had to create a mechanism that depended on it.

RE: Using runout on threaded feature?

What if the threaded feature is part of a linear actuator that requires very straight travel and there isn't room for a separate linear bearing or guide so the screw does the job.

We unfortunately have a couple of designs where this is the case - as some others in our industry appear to do.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

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!


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