What is UPR (Undulations Per Revolution) in Roundness

Can anybody explain UPR (Undulation per revolution) in roundness and what standard exists for same.

 

Howdy shankar,

Never heard of it before but was curious...and found this: http://digitalmetrology.com/mean-roundness/

I thought it was pretty informative, though not a "standard". I hope it helps...

Perhaps others specifically in the metrology field might comment..

 

I found this article as well. It does explain about the UPR ("harmonics") pretty well.
http://www.qualitymag.com/articles/85460-quality-101-controlling-roundness

I found this standard using a keyword search ("roundness") on Global IHS and found this: ASME B89.3.1. Not sure if it is completely applicable to your particular need.

Hope this helps!

 

I found this question after about 9 years. You have probably found the answer, but I just mention a very simple definition for other members who may have the same question in the future.

This is a term used for local deviations of a round (ISO) or circular (ASME) shape. Among some measuring strategies of roundness, measuring UPR is an outdated one. UPR means number of local deviations (roughness) per one revolution of the measuring device or machine. Then a cutoff filter is used to filter low frequency fluctuations according to some standard like ISO 12181-1:2011 (former ISO/TS 12181-1:2003) requirements and rules.