Computer Aided Design (CAD)

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Computer Aided Design(CAD)

• Week 12 Calculating the Volume Density of 3D
  Solid Models

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Calculate the Volume of a 3D Object in AutoCAD

• AutoCAD automatically gives the volume for any 3D
  Object (from the following drop-down menus)
• TOOLS
• -gt Inquiry
• -gt Region/Mass Properties
• (and then click on the object to obtain the
  information for.) Note Union separate
  extrusions/solids etc. to get the total volume
  firstly!!

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Calculate the Weight of a 3D Object in AutoCAD

• Both the Volume and Density of a 3D object are
  required to obtain its Weight.
• Weight (g) Volume (mm3) X Density (g/mm)
• g grams
• mm millimeters

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Example Weight Calculation Question

• Draw a Square 50mm x 50mm and Extrude it 50mm in
  AutoCAD.
• Obtain the volume of the Cube using AutoCAD.
• Assuming the Cube is made out of Brass having a
  Density of 8500kg/m3
• Calculate the Weight of the Cube of Brass (g)

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Example Weight Calculation Solution

• Total Volume (using AutoCAD) is
• 125000mm3
• Density is 8500kg/m3
• Converting to g/mm 0.0085g/mm
• Weight (g) 125000mm X 0.0085g/mm
• Weight 1062.5g