Whenever you create a new model, it is important to get the tree structure set up correctly. The model tree establishes the sequence that Moves, Tolerances, and Measurements (MTMs) are applied during the simulation so the model tree should be set up to mimic the real-world assembly process. For example, if several parts are built up in a sub-assembly before going to the final assembly, the model tree should contain a branch for that sub-assembly. Rearranging the tree in the middle of modeling is difficult and can cause data loss if done incorrectly. Recall that the model performs Tolerances first, then Moves, then Measures in each part starting at the lowest level in the tree. 3DCS can only "see down" the tree, i.e. an MTM can only reference parts within its branch of the tree. MTMs at the top level can reference all the parts in the model.
The first thing we will do is create a CATProduct and insert the Bracket, Headlamp, and Turnlamp parts. If you already have a CATProduct of your assembly, you can use that for the 3DCS model. We will start from scratch for the tutorial.
•Go to Start 
Analysis & Simulation and select 3DCS Analysis. A new CATProduct file will be created.
•Right-click the new product, Product1, from the V5 Navigation Tree and select Properties.
•In the Product tab, change the Part Number to "Lamp_SubAsm".
•Click [OK].
3DCS uses the Instance Name of the CATIA V5 part or product. For the top level product, there is no Instance Name so the Part Number is used. The Navigation Tree should look like the picture below.
•Go to Insert Existing Component.
•Select the Lamp_SubAsm as the component to insert into.
•Navigate to the User Lessons folder. The default location is in:
C:\Users\Public\Public Documents\DCS\3DCS_All Platforms_8_0_0_1\Tutorials\V5_Analyst_Tutorial
•Select the Bracket.CATPart, Turnlamp.CATPart, and Headlamp.CATPart and click [Open].
The Navigation Tree and Graphics Window should now look like the following picture.
The first thing we will do is create an Assembly and insert the Bracket, Headlamp, and Turnlamp. For other models, if you already have an Assembly of your parts, you can use that for the 3DCS model. We will start from scratch for the tutorial.
•Select File New.
•Under Templates, under Filters, set the Units to Millimeters if it is set to inches.
•Select Assembly and change the Name to "Lamp_SubAsm_Lesson2".
•Set the Folder to one that you have read/write access such as a folder on your desktop.
•Click [OK] in the New dialog.
•In the Add Component dialog, click the 
Open button:
•Navigate to the User Lessons folder. The default location is in:
C:\Users\Public\Public Documents\DCS\3DCS_All Platforms_8_0_0_1\Tutorials\NX_Analyst_Tutorial
•In the Users Lessons folder, select the Bracket, Headlamp, and Turnlamp files. Click [OK].
•In the Placement section, set Positioning to Absolute Origin. If in NX 12, set the Component Anchor to Absolute and the Assembly Location to Absolute - Work Part.
•Make sure Scatter Components or Scatter is unchecked. If in NX 12 this option will be available under Interaction Options in Settings.
•Click [OK] in the Add Component dialog.
The Assembly Navigator tree and Graphics Window should now look like the following images.
The first thing we will do is create an Assembly and insert the Bracket, Headlamp, and Turnlamp. For other models, if you already have an Assembly of your parts, you can use that for the 3DCS model. We will start from scratch for the tutorial.
Note: The instructions in this chapter are based on the procedure in Creo 3, in later releases the procedure may be slightly different.
•Go to File New and in the New dialog select Assembly for the Type and Design for the Sub-type.
•Change the Name to "Lamp_SubAsm_Lesson2" and click [OK].
The parts we will use in the assembly are in millimeters. We need to change the assembly file to use the same units.
•Select File Prepare Model Properties.
•Under Materials, click change to the right of Units.
•In the Units Manager dialog, select millimeter Newton Second (mmNs) then click [Set...].
•In the Changing Model Units dialog, in the Model tab, select Convert dimensions then click [OK].
•Click [Close] in the Units Manager dialog.
•Click [Close] in the Model Properties dialog.
•In the Model tab, click the 
Assemble button.
•Navigate to the User Lessons folder. The default location is in:
C:\Users\Public\Public Documents\DCS\3DCS_All Platforms_8_0_0_1\Tutorials\Creo_Analyst_Tutorial
•Select bracket.prt. Click [Open].
•From the Component Placement tab, select Default in the Relationship Type drop-down list (see image below). The status of the Bracket will change to Fully Constrained.
•Select the Green Check Mark to exit the Component Placement workspace and place the Bracket in its current, fully constrained position.
•Repeat this process to insert turnlamp.prt and headlamp.prt into the assembly.
The Model Tree and Graphics Window should now look like the following picture.
The first thing we will do is create a WTX file, which is an assembly of parts, and insert the Bracket, Headlamp, and Turnlamp. If your tree structure was already correct when you imported your CAD files, you can use that for the 3DCS model. We will start from scratch for the tutorial.
•Click the 
Application Button then select 
New.
•Double-click Root in the Navigation window to open the Edit Part dialog.
•Change the Name to "Lamp_SubAsm" then click [OK].
•Select the Application Button then Import HSF File.
•Navigate to the User Lessons folder. The default location is in:
C:\Users\Public\Public Documents\DCS\3DCS_All Platforms_8_0_0_1\Tutorials\MC_Analyst_Tutorial
•Select the Bracket.hsf, Headlamp.hsf, and Turnlamp.hsf and click [Open].
•If you cannot see the imported parts, select the Display tab then click 
Autoscale to fit all parts in the window.
The Navigation Window and Graphics Window should now look like the following picture.
The first thing we will do is create a Physical Product and insert the Bracket, Headlamp, and Turnlamp. For other models, if you already have a Physical Product of your assembly, you can use that for the 3DCS model. We will start from scratch for the tutorial.
•Highlight the 
Insert icon and select Content... The New Content dialog will appear.
•Select Physical Product from the New Content dialog to create a new Physical Product.
•Right-click on the new Physical Product in the model tree and select Properties.
•In the Reference tab of the Properties dialog, change the Title to "Lamp_SubAsm".
•Right-click on the Lamp_SubAsm and select Insert Existing Product...
•In the search field, type and search the name for each part: Turnlamp, Headlamp, and Bracket.
The Navigation Tree and Graphics Window should now look like the following image for Lamp_SubAsm.
Creating a 3DCS Simulation
In 3DEXPERIENCE, 3DCS needs to use either a Mechanical and Kinematic Simulation to hold and save the 3DCS data with the model.
•Highlight the Insert icon and select Content... The New Content dialog will appear.
•In the New Content dialog select Manufacturing Simulation (in Simulation Meta-Modeler).
•Right-click on the new Manufacturing Simulation in the model tree and select Properties.
•In the Reference tab of the Properties dialog, change the Title to "Analyst_Tutorial_Lesson2".
•In the Compass, go to the South Quadrant (labeled V+R) and select 3DCS Variation Analyst V6 in the V+R My Simulation Apps section. This will change the workbench to 3DCS Variation Analyst.
The Navigation Tree and Graphics Window should now look like the following image for Analyst_Tutorial_Lesson2.
•Highlight the 
Share icon and select Save in the drop-down list to save the Simulation and Assembly.
The first thing we will do is create a new Assembly and insert the Bracket, Headlamp, and Turnlamp parts. For other models, if you already have an Assembly of your parts, you can use that for the 3DCS model. We will start from scratch for the tutorial.
•Go to File New and in the New SOLIDWORKS Document dialog select Assembly.
•In the Begin Assembly dialog, select [Browse...].
•In the Open dialog, navigate to the User Lessons folder. The default location is in:
C:\Users\Public\Public Documents\DCS\3DCS_All Platforms_8_0_0_1\Tutorials\SW_Analyst_Tutorial
•Select Bracket.sldprt and click [Open].
•Select 
OK in the Begin Assembly tab to place the Bracket at the origin.
•In the Assembly tab select 
Insert Components and then [Browse...] to return to the Open dialog.
•Select Headlamp.sldprt then once again select [Open] and OK.
•Repeat the previous steps to insert Turnlamp.sldprt into the model at the origin.
•If you cannot see the imported parts, select the 
Zoom to Fit button to fit all parts in the window.
The display name for the assembly will be a default name (such as Assem1) until we save the model so next we must save the model with an appropriate name.
•Go to File Save As and change the name to "Lamp_SubAsm_Lesson2" and select [Save] to save the model and close the Save As dialog.
The Navigation Tree and Graphics Window should now look like the following image.
The parts we will use in the assembly are in millimeters. We need to ensure the assembly file is using the same units.
•Right click Lamp_SubAsm_Lesson2 and select Document Properties.
•From the list on the left select Units and ensure that MMGS (millimeter, gram, second) is selected in the Unit system section.
•Select [OK] to close the Document Properties dialog with the changes saved.