Positional tolerance with RFS 1

[srinivasvama]

Hi Friends,

Iam working on a drawing inspection with a positional tolerance of hole is given as Dia. 4.875-4.874 , with 0.002 as the valve in feature control frame to datum reference A and B, please help me to find the dimension at RFS to consider for inspection.

 

[rsm7400]

According to the information I see it would appear that you are looking for the center Ø to be concentric to the outer Ø and maybe perpendicular to the face.

________________________________
Ryan M
Quality Engineer
3d Printer Hobbyist

 

[Tunalover]

That view is not a good one to specify the dimensions and tolerances. A view showing both concentric circles would be MUCH better. Also, the drafting is pretty sloppy. Are you new to the software? For example, the arrowhead on the leader for the inner hole diameter and positional tolerance should be moved to the other end of the leader at the hole.


Tunalover

 

[JNieman]

I don't see Datum B identified on the part.

I do not understand where you are getting the diameters 4.875-4.874.
I do not understand where you are seeing the 0.002.

Is this the right picture you meant to upload? It is possible I am missing something.

_________________________________________
NX8.0, Solidworks 2014, AutoCAD, Enovia V5

 

[powerhound]

srinivasvama,

You are missing a lot of information. Also consider that tolerance is a matter of function so without knowing how this is supposed to work, I don't think anyone here can suggest a tolerance value.

John Acosta, GDTP Senior Level
Manufacturing Engineering Tech



SSG, U.S. Army
Taji, Iraq OIF II

 

[tbuelna]

Like the others noted, there are two datum A surfaces and no datum B surface shown. You also need to provide a bit more definition of the relationship between the hole and disc, such as a centerline through the hole/disc center. A thickness dimension of the disc would also be helpful, as would something like a profile or flatness tolerance for the disc face used as the primary datum.

 

[mtkenney]

wasn't RFS done away with in 1994?

 

[ewh]

The symbol was... now it is assumed unless otherwise indicated.

"Know the rules well, so you can break them effectively."
-Dalai Lama XIV