Datum shift 2

[Sa-Ro]

Hi

Refer my attachment.

What is use of datum shift?

Everyone defining, we can adjust the datum feature during inspection to make the corresponding feature approved.

My doubt:
To ensure the coaxiality of dia 10, the gauge ID will be V.C of 10.2.

As long as the dia 10 feature manufactured within dia 0.1 position tolerance, is there any use with datum shift?

(or)

If the feature is out of tolerance and by utilizing this datum shift we can make this feature approved?

 

[Burunduk]

you were simply trying to show why OP's calculation was incorrect

Not quite so. I was trying to show how to make a correct (first approximated and then more precisely measured) evaluation of what he wanted to find out.

 

[chez311]

Noted.

 

[3DDave]

(Messed up a label in the diagram. Gotta love the changes in the 1.0 Inkscape.)

 

[3DDave]

Of the OP original case, see the following image. The scale is exaggerated to show an acceptable solution. I did not include the position tolerance / Virtual condition of the considered feature to avoid the clutter of small features, but it just adds to the amount of misalignment (not algebraic addition, but requiring "complex" trigonometry to evaluate.

If the goal is a sloppy fit on both features then this is the sort of datum reference and geometric characteristic to get that job done.

 

[greenimi]

Burunduk,

The sketch you provided is in Creo? Or ProE? Wildfire?
Could you attach it, for my own education and reference?

Burunduk (Mechanical)
8 Jun 20 11:06

I am talking about this sketch