perpendicularity

[[Me...]]

I was in a 'sharing' mood so here is what I found today.
Perpendicularity of .0005" of a planar surface relative to datum C (regardless of feature size). Datum C is a cylinder .640" long. The plane is roughly 6.400" X 6.400". What's the odds...?
🙄

[[Ja...]]

You are lucky you don't have only 10 degrees of the cylinder to work with.