To set critical dimensions for a Shrink analysis

The Shrink analysis verifies whether critical dimensions can be met, given the calculated recommended % shrinkage allowance for the part as a whole.

1. Click (Optimization Criteria tab > Dimensions panel > Critical Dimensions) and select Shrink from the drop-down menu.
2. For each critical dimension to be defined:
   1. Click on a location at one end of the critical dimension.
   2. Click on the location at the other end of the critical dimension. The distance between the two locations is displayed.
   3. Specify the allowed +ve and -ve tolerances for the selected model dimension or accept the default values which represent +/- 5% of the modeled dimension.
   4. Click Apply to create the critical dimension input for Shrink analysis. The critical dimension will appear as a light blue bar on the part. It will be placed in a separate layer containing critical dimensions for Shrink analysis. This layer is located in the Constraints layer folder.
      Note: You can add a critical dimension to a CAD model and on meshing, a node is created at the end points of the critical dimension. After the CAD model is meshed, you can only select the nearest node for your dimension.
3. To change the attributes of an existing critical dimension:
   1. Click Select.
   2. Click on the critical dimension symbol (light blue solid line).
   3. Right-click and select Properties from the context sensitive menu.
   4. Edit the properties as required and click OK.