What is ʼInterference Detectionʼ in SolidWorks?
Short Answer
Interference Detection in SolidWorks is a tool that checks an assembly for overlapping parts or bodies that occupy the same space. The most common professional method is running Interference Detection from the Evaluate tab on the full assembly before release. It does not automatically fix the interfering geometry.
What You Need to Know Before
Warning: Interference Detection can report false positives when parts are intended to touch, use shrink-fit logic, or include cosmetic threads and imported geometry. A very common failure is checking only the top-level assembly while missing interference inside subassemblies.
How to Use Interference Detection in SolidWorks
Command: Interference Detection
Shortcut: None by default
Quick Steps:
- Open the assembly, then go to the CommandManager Evaluate tab and click Interference Detection.
- In the PropertyManager, choose the components to check or leave the full assembly selected.
- Turn on options like Treat coincidence as interference if needed, then click Calculate to review detected overlaps.
Variables & Settings
Key Setting: Treat coincidence as interference
Expert Setting: This option flags faces that exactly touch as interference. Leave it off for normal clearance checks, and turn it on only when your standard requires detecting zero-clearance contact conditions.
Why it Fails
- Cause 1 (Geometry): Imported or non-manifold geometry can create inaccurate interference results or unstable body contacts.
- Cause 2 (layers/Locks): Lightweight or unresolved components in the assembly environment may prevent complete detection results.
- Cause 3 (Command/Logic): Running the tool without including subassemblies or using the wrong coincidence setting can miss real clashes or create misleading results.
Quick Fix & Best Practice
- Quick Fix: Fully resolve the assembly, then rerun Interference Detection with the correct scope and the Treat coincidence as interference option set appropriately.
- Manager’s Verdict: Use Interference Detection as a standard assembly validation step before design release, especially for machined fits, enclosures, and motion-critical layouts. Avoid relying on it alone when clearance under movement also matters.
FAQ
How is Interference Detection different from collision detection?
Interference Detection checks static overlap, while Collision Detection checks contact during movement.
Can SolidWorks detect interference inside subassemblies?
Yes, but only if the subassemblies are included and properly resolved in the check.
Does Interference Detection work on multibody parts?
Yes, SolidWorks can check interference between bodies when using the appropriate selection context.
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