Lesson 21 of the GD&T Explained series. A 1D stack-up handles straight-line assemblies. But angled brackets, dovetails, pivoted linkages, and cam profiles need 2D — decompose each angular dimension into X and Y components, run two independent 1D stacks, combine for the end-point envelope. This lesson works the full 2D method with a 30° link example.
In this lesson:
00:00 Intro
00:30 Decomposing a 30° link into X and Y
02:00 Running two parallel 1D stacks
03:15 Feature types that need 2D
03:50 Recap + what's next
What you'll be able to do after this lesson:
• Decompose an angular dimension and its tolerance into X and Y components
• Run two independent 1D stacks — one per axis — using the same sign-convention rules
• Combine X and Y results into a rectangular or radial worst-case envelope
• Recognize which assembly types (brackets, dovetails, linkages, cams) need 2D
