I've made some adjustments. I used the chain line instead along with a reference diameter to indicate where the flatness spec is needed. I also included the radius dimension for the inner corner which I had previously forgotten (Thank you dgallup for the reminder).
Yes, the datum feature will...
Thank you all again for chiming in. I've attached another image of the drawing with the changes based on the suggestions here.
I noticed your response after I updated the drawing. In what way will this impact the call out...
Hello
I was wondering if anybody had some advice on the proper way to call out a flatness tolerance using GD&T but only for a partial surface. The application is a mechanical seal. I've attached a drawing for illustration. The surface in question is labeled datum A with the .001 flatness call...