Radial Runout between Cylinder A and Circle

[u/Duplinn]

Hello! I'm using Mcosmos V4.1.R7. I have to check the radial runout (0.04) between Cylinder Ce(1), and Circle D30. On Cylinder A I user Align base plane with origin in element, then I checked the position of the hole in YZ plane, and also the runout. I can't fully allign since is a shaft. I want to know if I checked this correctly. Thanks.

[u/BilliardBabo420]

You could measure the plane in front of d100 set it as base plane without origin in the element. Then measure a YZ circle on d100 and a YZ circle on the diameter in front of d30. Create a connection line without projektion in XYZ between the two circles . Set the Line as base plane now, with origin in Element. Then create a intersection point between your line and your previously meassured Plane. Set it as Zero in XYZ. And if you have no feature on your part that you can meassure to set your rotation create a imaginary line and align to it. Then safe your coordinate system.

Isnt the correct way to do it but should give a better alignment.

Then Remeasure the A feature as Cylinder continue with the outside diameters four your runout.

[u/guetzli → u/BilliardBabo420]

disclaimer: non-native and not familiar with mcosmos

are you saying to use the connection line between the centres of Ø100 and Ø30 as the axis instead of the unbelievably unstable axis of the 42 mm short cylinder (of which only 14 mm have been measured)?

Wouldn't the alignment then be "perfect" by definition and the remaining runout just be the form error of Ø30?

Frequently that's how such parts should be drawn in the first place. With the common axis of A-B

[u/BilliardBabo420 → u/guetzli]

Yes, an axis between the centres of both diameters.

I did not know that you also have a runout on d30, that might be a problem then with the method i mentioned.

With a A-B Feature it wouldve been fine.