hexagon logo
Register Sign in
  • Replies 6 replies
  • Subscribers 223 subscribers
  • Views 67 views
  • Users 0 members are here
Options
Related

Concentricity and runout

pcdmisstudent
Hi So I got this part where an ID is datum A (measured as circle)
then i have an OD (also circle) which i evaluate runout and concentricity on.
The runout deviation of the OD is about 0.01mm but the concentricity deviation is around 0.07mm

How can this be?
Correct me if I'm wrong but i know both runout and concentricity is how an object deviates from a perfect circular shape or position.
so runout basically measures the wobble when rotating to an axis (so circularity and position)

And concentricity is how closely the object and the datums axis are aligned to each other (so circularity isn't involved)

How can the concentricity deviation be so much higher than the runout?

Ty all for the gdpt tips!
Parents
  • If I'm not mistaken runout is about surface control to the datum whereas concentricity is about location of median of points within circular zone to the datum. Two different things. Anyway I've been hearing newest ASME standard does it away with concentricity & symmetry altogether being replaced with position. This ain't surprising because concentricity is basically a position without feature MMC & LMC modifiers. I've seen that once before where for some reason conc was worse than runout and/or position but that was checked via the point to point probe head not scanning head maybe that is why such big difference. I heard from GD&T instructors that they recommended checking conc via roundness tester.
Reply
  • If I'm not mistaken runout is about surface control to the datum whereas concentricity is about location of median of points within circular zone to the datum. Two different things. Anyway I've been hearing newest ASME standard does it away with concentricity & symmetry altogether being replaced with position. This ain't surprising because concentricity is basically a position without feature MMC & LMC modifiers. I've seen that once before where for some reason conc was worse than runout and/or position but that was checked via the point to point probe head not scanning head maybe that is why such big difference. I heard from GD&T instructors that they recommended checking conc via roundness tester.
Children
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement