hexagon logo
Register Sign in
  • Replies 36 replies
  • Subscribers 223 subscribers
  • Views 528 views
  • Users 0 members are here
Options
Related

How to properly measure circular runout on a cylinder?

ESchertz
I have a bore that is Datum B. It has a perpendicularity callout to Datum A, which is a flat surface. So, I have to measure it as a cylinder. I have another bore that has a circular runout callout to AB. So do I have to measure B again as a circle? Because I would have to assign that as another datum to build the feature control frame. But if I just use B as a cylinder, then wouldn't it be measuring total runout and give me a different result than circular runout?
Parents


  • , Are you able to share the drawing (or a sketch) showing the datums, the feature and the callout's you are tying to verify? When you say the Geometric Tolerance command "wouldn't allow it", what wouldn't it allow? What error message(s) do you see and for which callout? From your description, I suspect it's this...




    Hi Neil, here is the callout. Everything here, but the runout makes sense to me. E is a bore and A is a plane. When I say it wouldn't allow it, what I mean is that when I select runout, the E bore is available in the feature list, but the A datum is not, whether I select E as a circle or a cylinder.



    ​
  • in reply to The Hermit
    As I explained previously, if datum A is a plane and E is a cylinder then the runout tolerance is invalid because datum A has no centre of revolution. A plane can only constrain three degrees of freedom (two rotations and a single translation). The datum reference frame needs a second datum to constrain the remaining two translations.
Reply
  • in reply to The Hermit
    As I explained previously, if datum A is a plane and E is a cylinder then the runout tolerance is invalid because datum A has no centre of revolution. A plane can only constrain three degrees of freedom (two rotations and a single translation). The datum reference frame needs a second datum to constrain the remaining two translations.
Children
No Data
© 2024 Hexagon AB and/or its subsidiaries. Privacy Policy | Cloud Services Agreement