How to put two separate 3D parts together in Autodesk Fusion?
Short Answer
Yes — in Autodesk Fusion, the most common professional way to put two separate 3D parts together is to place them as components and connect them with the As-Built Joint command. This method keeps the assembly editable and accurately defines position and motion. Limitation: it works best when the parts are already in the correct starting location.
What You Need to Know Before
Warning: If your 3D parts are still simple bodies instead of separate components, Fusion may not let you assemble them correctly with joints. A very common failure is trying to joint imported solids that were never converted into components first.
How to Put Two Separate 3D Parts Together in Autodesk Fusion
Command: As-Built Joint
Shortcut: J
Quick Steps:
- In the Browser, make sure each part is its own component; if needed, right-click a body and choose Create Components from Bodies.
- Go to the Solid tab > Assemble panel > As-Built Joint.
- Select the two components, then choose a Joint Type such as Rigid if they must stay fixed together, and confirm with Capture Position if prompted.
Variables & Settings
Key Setting: Joint Type
Expert Setting: The selected joint type controls how the two parts behave after assembly. Use Rigid to lock them together with no movement, or use options like Revolute only when the design needs controlled motion.
Why it Fails
- Cause 1 (Geometry): The parts are not separate components, so Fusion cannot apply assembly behavior correctly.
- Cause 2 (layers/Locks): One component is grounded or linked from another design, preventing expected movement or repositioning.
- Cause 3 (Command/Logic): As-Built Joint assumes the parts are already positioned properly; if they are far apart or misaligned, a standard Joint may be the better choice.
Quick Fix & Best Practice
- Quick Fix: Convert both parts into components, move them close to the correct location, then run As-Built Joint with Rigid.
- Manager’s Verdict: Use As-Built Joint for the fastest assembly workflow when parts are already placed correctly. Avoid forcing it on badly positioned imported parts; in that case, use Joint or align the components first.
FAQ
Can I join two bodies without making components?
Not reliably for assembly workflows; components are the standard method.
What joint should I use if the parts must not move?
Use a Rigid joint.
What if the two parts are not lined up yet?
Use Joint or move the components into position before using As-Built Joint.
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