What is an ʼAs-Built Jointʼ in Autodesk Fusion?
Short Answer
Yes — in Autodesk Fusion, an As-Built Joint defines the motion or fixed relationship between components that are already in their final position, without moving them during placement. The most common professional method is the As-Built Joint command in the Assemble menu. Limitation: it does not reposition misaligned components for you.
What You Need to Know Before
Warning: As-Built Joints only work correctly if the components are already placed exactly where they should be. A very common failure is creating the joint before grounding or fully positioning parts, which can cause unexpected motion or assembly conflicts later.
How to Create an As-Built Joint
Command: As-Built Joint
Shortcut: None by default
Quick Steps:
- In the Ribbon > Assemble panel, click As-Built Joint.
- Select the two components that are already in the correct assembled position.
- Choose the Type of joint, such as Rigid, Revolute, or Slider, then confirm with OK.
A common professional option is the Flip toggle, used when the joint orientation or motion direction is reversed.
Variables & Settings
Key Setting: Joint Type
Expert Setting: The selected joint type controls allowable motion between the two components. For example, Rigid removes all relative motion, while Revolute allows rotation around one axis. Choosing the wrong type is one of the most common setup errors.
Why it Fails
- Cause 1 (Geometry): The components are not actually in their final assembled location, so the As-Built Joint preserves the wrong relationship.
- Cause 2 (layers/Locks): One component may be Grounded or affected by rigid group behavior, preventing the expected movement during testing.
- Cause 3 (Command/Logic): As-Built Joint does not infer missing alignment like a standard Joint can; it only applies motion rules to the current position.
Quick Fix & Best Practice
- Quick Fix: Use Move/Copy to place components correctly first, then reapply As-Built Joint with the correct Joint Type.
- Manager’s Verdict: Use As-Built Joint for imported hardware, existing assemblies, and top-down designs where parts are already positioned. Avoid it when components still need alignment or precise snap-based placement.
FAQ
What is the difference between Joint and As-Built Joint in Fusion?
A standard Joint can position components, while an As-Built Joint keeps components where they already are.
Can an As-Built Joint be edited later?
Yes, you can edit the joint type and settings from the timeline or browser.
Is As-Built Joint good for imported assemblies?
Yes, it is one of the best methods when imported components are already in the correct location.
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