Machinable cast parts

Background

When modeling cast parts, the part model often ends up with a large number of features. This can slow down editing, as the software needs to execute and update the modeling steps every time a feature is modified. The number of features—and thus the response time—can be easily reduced by creating a separate model for the cast part and performing the machining operations in a machining assembly.

The same casting model can be used in several different machining assemblies, allowing the same part to be machined for different purposes. Machining operations can also exist in different appearances (configurations) within the same assembly.

The same technique also works well for 3D-printed parts that are machined after printing. These parts also typically contain a large number of features.

Do the following

Model the cast part first

Include only the features required for the casting – do not model any machining features.

Image 1: Cast part model

Create a machining assembly

Load the previously created cast part into the assembly.

Image 2: Assembly with the cast part imported for machining

Model the machining tools

Create one or more local parts and assign them the “Tool” property.

Image 3: New machining operation

Model the machining features as usual. The result is a geometry like in the image.

Image 4: Machining features in the assembly
You can toggle the visibility of tool-type parts using the "M" key.

Additional settings

To ensure the machining affects only this specific assembly, assign the following property to the machining parts:

Image 5: Properties of a machining part

Execute the machining operations

Right-click the machining part: Machining Features → Execute

Image 6: Final result – machined gearbox cover

Connection to the real world

The structure of the assembly follows the same principle as shown in the step-by-step manufacturing process of a part. The finished part is its own item, but the semi-finished casting can also be a separate item if it is stored in inventory in advance.

Product structure

If you are using Vertex Flow, the assembly will appear there with the structure shown in the image.