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

Runout versus Ovality

Runout versus Ovality

Runout versus Ovality

Hello all,
There is a difference of opinion when sitting on the same face of a part that you are checking either runout or ovality. While sitting on face A there is a probe on that same face A monitoring 360° movement. Some say Runout some say Ovality. What is the real answer?

Thank you all in advance for answers.

RE: Runout versus Ovality

You need to define how the surface you're measuring relates to the datam you've chosen to use. You also need to define which drawing/measurement standards you're using as different standards use different terminology.
Other terms to consider are perpendicularity, parallelism, out-of-round, concentricity, etc.

RE: Runout versus Ovality

I'd say you are measuring runout. Runout can be made up from different specific contributors like ovality.

RE: Runout versus Ovality

I don't believe the ASME Y14.5 GD&T standard describes an "ovality" characteristic. This condition would usually be toleranced with a cross section profile defined by basic dimensions, and a geometric profile tolerance callout referencing the basic profile.

RE: Runout versus Ovality


Your post regarding ovality and harmonic analysis of radial profile shapes was helpful. I did some reading on the subject and learned that ovality describes a specific runout profile having 2 undulations (or lobes) per revolution (UPR). The harmonic characteristics of a runout profile, such as ovality, are often evidence of certain problems with the set-up/process used to manufacture a precision cylindrical part. Below is an interesting chart on the subject from this brochure:

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


White Paper - How ESI is Helping Move New Medical Device Product to Market Quicker & More Cost Effic
Early Supplier Involvement has long been a strategy employed by manufacturers to produce innovative products. Now, it almost seems like a necessity. Because decisions made in the design phase can positively affect product quality and costs, this can help add value to OEM bottom lines. This white paper will discuss many facets of ESI, including why it’s so valuable today, what challenges limit the benefits of ESI, how cost is impacted, 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