How to find out how much your 3D part weighs (Mass Properties) in SolidWorks?
Short Answer
Yes — in SolidWorks, you can find how much your 3D part weighs by using mass properties, which calculates mass from the model’s solid volume and assigned material density. This is the standard professional method for checking part weight quickly and accurately. Limitation: the result is wrong if material or units are incorrect.
What You Need to Know Before
Warning: Mass in SolidWorks depends entirely on the part being a valid solid body with a correctly assigned material. A very common failure is reading the value before material is applied, which gives incorrect mass or only volume-based data.
How to Find Part Weight in SolidWorks
Command: Mass Properties
Shortcut: No default keyboard shortcut
Quick Steps:
- Open the part file, then go to Evaluate tab on the CommandManager and click Mass Properties.
- In the Mass Properties dialog, confirm the part has an assigned material in the FeatureManager design tree.
- Read the Mass value and check the Options/Override Mass Properties state if applicable to ensure you are using calculated values, not overridden ones.
Variables & Settings
Key Setting: material assignment
Expert Setting: The material applied to the part controls density, which directly determines the mass result. Also verify the document Units setting, because mass may display in grams, kilograms, or pounds depending on the file configuration.
Why it Fails
- Cause 1 (Geometry): The model is not a closed solid body, so SolidWorks cannot calculate true mass correctly.
- Cause 2 (layers/Locks): In assemblies or imported workflows, bodies may be suppressed, hidden, or excluded from calculation, causing misleading total weight.
- Cause 3 (Command/Logic): No material is assigned, or Override Mass Properties is enabled, so the displayed mass does not reflect actual geometry and density.
Quick Fix & Best Practice
- Quick Fix: Right-click Material in the FeatureManager, assign the correct material, then rerun Mass Properties from the Evaluate tab.
- Manager’s Verdict: Use Mass Properties for all routine weight checks, but never trust the number until material, units, and solid-body status are verified—especially before release, costing, or simulation.
FAQ
How do I add material to a part in SolidWorks?
Right-click Material in the FeatureManager and choose a material from the library.
Can SolidWorks show weight in kilograms or pounds?
Yes, the displayed mass follows the document’s unit settings.
Why is Mass Properties grayed out in SolidWorks?
Usually because the file has no valid solid body or the geometry is unsuitable for mass calculation.
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