Part Modeling > Engineering Features > Lattice > To Create Custom Lattice
  
To Create Custom Lattice
You can create lattice by custom designing your own lattice cell in Creo Parametric Part mode, and then importing the PRT file into the part model to use as the lattice cell.
Create a part to use as the lattice cell
Before you begin the lattice in the part model, in Part mode, create a part to use as a single cell in the Lattice feature. The cell must meet these requirements:
• Solid geometry
• Prismatic
• Six-sided
• The imported cell’s x-, y-, and z-directions are determined by the x-, y-, and z-directions of the part model’s coordinate system. The other lattice cells will be propagated in these same directions.
The outline of the imported cell is determined by the edges (contours) of its solid geometry. Convex surfaces such as a spherical surface that bulges beyond this outline would cause the lattice cells to overlap each other.
Therefore, for cells to align and merge with each other properly, it is recommended that all six boundaries of the imported cell contain planar surfaces that are normal to the x-, y-, and z-directions.
• It is also recommended that parallel boundaries have matching contours.
The geometry is imported on a 1:1 scale. Scaling is uniform, if you change the cell size in one direction, it will update all the directions.
Create the lattice
1. In the model, click Engineering > Lattice. The Lattice tab opens.
2. On the Lattice tab, perform these actions:
a. Next to Lattice type, select Custom.
b. To import a part to use as the lattice cell:
a. Click Open Cell. The Open dialog box opens.
b. Browse to the PRT file to use as the lattice cell, and click Open.
c. To define the direction with which the Z axis of the cell is aligned, select Z, X, or Y.
3. Click the Lattice Region tab, and define the lattice region. See To Define the Lattice Region.
4. Click the Cell Type tab, and define the structure of the cells:
a. Optionally, to change the part to use as a cell:
a. In the collector, right-click the PRT file and select Remove. The cell part is deleted.
b. Click . The Open dialog box opens.
c. Browse to the part to use as the lattice cell, and click Open.
b. To define the cell scale, next to Fixed scale, type the scale for the cell in relation to its size when you import it.
5. Click OK. After you click OK, you cannot change the imported cell, whether the custom lattice is created or fails.
After you click OK, you can change the lattice type from Custom to another type, but then you cannot change it back to Custom, and you cannot import a custom lattice cell into the lattice feature.