Std MassProperties/cs

The Std MassProperties command starts the mass properties measurement feature. It provides the following information:

• Physical Properties
  • Volume
  • Mass
  • Density
  • Surface area
• Center of gravity
• Center of volume
• Inertia
  • Inertia matrix
  • Principal moments of inertia
  • Inertia around axis - replaces the aforementioned inertia measures if a datum line is used as a reference for inertia calculations

The task panel of the command

Usage

1. Optionally preselect the solids to be measured.
2. There are several ways to invoke the command:
   • Press the Mass Properties button.
   • Select the Tools → Mass Properties option from the menu.
3. A task panel opens. See Options for more information.
4. If no solids were preselected, select them in the 3D View or Tree View.
5. Press the Reset button to clear the measurement or the Save button to keep it. Saved measurements are put in a Measurements group in the Tree View.
6. Press Esc or the Close button to finish the command.

Options

• Reference:
  • Center of gravity - use the center of gravity as a reference to compute inertia.
  • Custom - press the Select… button and pick the reference - datum line or local coordinate system.
• Unit system:
  • mm, kg, kg*mm^2
  • m, kg, kg*m^2
  • in, lb, lb*in^2
  • ft, lb, lb*ft^2
• Create Datum Point button in the Center of Gravity or Center of Volume section - creates a datum point at this location.
• Create Principal Axes LCS in the Inertia section - creates the corresponding local coordinate system.