Get Mass Properties of Assembly Component Example (VBA)

An assembly component (part or sub-assembly) can contain assembly-level features, typically cuts. These features affect the mass properties, but the features are not present in the part or sub-assembly.

This example shows to get the mass properties of an assembly component.

'----------------------------------------------------
' Preconditions:
' 1. Open an assembly document.
' 2. Select a component,
' 3. Open the Immediate window.
' 4. Run the macro.
'
' Postconditions: Examine the Immediate window.
'
' NOTE: The mass property values are returned relative to
' the component origin, not the assembly origin.
'----------------------------------------------------

Option Explicit

Sub main()

    Dim swApp                   As SldWorks.SldWorks
    Dim swModel                 As SldWorks.ModelDoc2
    Dim swSelMgr                As SldWorks.SelectionMgr
    Dim swComp                  As SldWorks.Component2
    Dim swCompModel             As SldWorks.ModelDoc2
    Dim swCompBody              As SldWorks.Body2
    Dim vMassProps              As Variant
    Dim nDensity                As Double
    Dim bRet                    As Boolean
    

    Set swApp = Application.SldWorks
    Set swModel = swApp.ActiveDoc
    Set swSelMgr = swModel.SelectionManager
    Set swComp = swSelMgr.GetSelectedObjectsComponent3(1, 0)

    Set swCompBody = swComp.GetBody
    Set swCompModel = swComp.GetModelDoc

    ' Calculate component material density
    nDensity = swCompModel.GetUserPreferenceDoubleValue(swMaterialPropertyDensity)

    ' Use this method to get component mass properties
    vMassProps = swCompBody.GetMassProperties(nDensity)

    Debug.Print "File = " & swModel.GetPathName
    Debug.Print "  Comp     = " & swComp.Name2
    Debug.Print "  Config   = " & swComp.ReferencedConfiguration
    Debug.Print "  Density  = " & nDensity & " kg/m^3"
    Debug.Print ""
    Debug.Print "  CenterOfMass = (" & vMassProps(0) * 1000# & ", " & vMassProps(1) * 1000# & ", " & vMassProps(2) * 1000# & ") mm"
    Debug.Print "  Volume       = " & vMassProps(3) * 1000000000# & " mm^3"
    Debug.Print "  Area         = " & vMassProps(4) * 1000000# & " mm^2"
    Debug.Print "  Mass         = " & vMassProps(5) & " kg"
    Debug.Print "  MomXX        = " & vMassProps(6) & " kg*m^2"
    Debug.Print "  MomYY        = " & vMassProps(7) & " kg*m^2"
    Debug.Print "  MomZZ        = " & vMassProps(8) & " kg*m^2"
    Debug.Print "  MomXY        = " & vMassProps(9) & " kg*m^2"
    Debug.Print "  MomZX        = " & vMassProps(10) & " kg*m^2"
    Debug.Print "  MomYZ        = " & vMassProps(11) & " kg*m^2"

End Sub