What is ʼMass Propertiesʼ in SolidWorks?
Short Answer
mass properties in SolidWorks calculates physical values for a part or assembly, such as mass, volume, surface area, center of mass, and moments of inertia, using assigned material and body geometry. The most common professional method is to run Mass Properties from the Evaluate tab. Limitation: results are only reliable when material and body status are correct.
What You Need to Know Before
Warning: Mass Properties can return misleading values if the model has no material assigned, contains hidden/suppressed bodies, or includes lightweight/resolved assembly differences. A very common failure is trusting the mass of an assembly before verifying excluded components and weldment cut-list body settings.
How to Use Mass Properties in SolidWorks
Command: Mass Properties
Shortcut: None by default
Quick Steps:
- Open the part or assembly, then go to the Evaluate tab on the CommandManager and click Mass Properties.
- Review the calculated values in the Mass Properties dialog, including mass, volume, surface area, center of mass, and moments of inertia.
- If needed, enable or verify options such as Use custom settings or check the document’s material assignment before accepting the result.
Variables & Settings
Key Setting: Override Mass Properties
This option lets you manually replace calculated mass values for a part or body. It affects bom accuracy and downstream weight reporting, so professionals typically use it only for purchased parts, simplified vendor models, or confidential internal components where true geometry is not modeled.
Why it Fails
Cause 1 (Geometry): The model contains open surfaces, zero-thickness geometry, or non-solid bodies, so SolidWorks cannot calculate valid solid mass correctly.
Cause 2 (layers/Locks): In assemblies, suppressed, hidden, lightweight, or envelope components may be excluded or handled differently than expected, changing the reported result.
Cause 3 (Command/Logic): No material is assigned, or an overridden mass value is active, so the reported mass does not reflect the actual modeled geometry.
Quick Fix & Best Practice
Quick Fix: Assign the correct material by right-clicking Material in the FeatureManager, then rerun Mass Properties from the Evaluate tab.
Manager’s Verdict: Use Mass Properties early for design checks and again before release, but never trust the number until material, suppression state, and override settings are verified in the final configuration.
FAQ
How do I check mass in a solidworks assembly?
Open the assembly and run Mass Properties from the Evaluate tab.
Why is mass showing as zero in SolidWorks?
The model may be a surface body, have invalid geometry, or lack proper solid volume.
Can solidworks mass Properties be wrong?
Yes, especially if material, configuration state, or mass override settings are incorrect.
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