Creating Assembly Models New Assembly models are created from a default template, which contains default datum planes and a coordinate system. The first component in an assembly is typically placed with a Default constraint, which centers the component in the assembly.

1. Click Datum Planes from the main toolbar to enable their display.
2. Click New and select Assembly as the Type.
   • Type PISTON_ASSY as the Name and press ENTER.
   • A new assembly model is created from the default template.
3. Click Add Component from the feature toolbar (on the right).
   • Select PISTON.PRT and click Open.
   • Change the constraint type from Automatic to Default in the dashboard.
   • Click Complete Component .
4. Press CTRL and select datum planes ASM_RIGHT, ASM_TOP, and ASM_FRONT from the Model Tree.
   • Right-click and hold, then select Hide.

PISTON.PRT Assembled