How to Cut 3D Model in NX: 1 Minute to Master Cutting Techniques in NX

Cutting a 3D model in Siemens NX, whether for prototyping, reverse engineering, or simple modification, is a fundamental skill for any designer. The process typically involves using features like “Trim Body,” “Split Body,” or “Boolean” operations within the NX environment. Here’s a straightforward workflow you can follow:

1. Open your 3D model: Load the part or assembly you want to modify in NX.
2. Create a cutting geometry: You often need a plane or a sketch that defines the split location. Use the “Datum Plane” tool (found in Home → Datum Plane) to position your cutting plane strategically.
3. Use the Split Body feature: With your plane selected, go to Insert → Trim → Split Body. Select your solid body and the cutting plane as reference, then execute the command. The part will be divided into distinct sections that you can manipulate or delete as needed.
4. Alternative - Trim Body/Boolean: For more complex shapes, create a solid body or surface to serve as a cutting object. Use Insert → Combine → Subtract (boolean difference) to remove material with this new solid.
5. Refine and finish: Clean up unintended edges using features like “Delete Face” or “Blend” to ensure the finished model appears as intended.

As a designer, I always recommend planning your cuts in relation to both the visual harmony and functional requirements of the design. Visualizing section styles and flows ahead of time helps ensure your modifications support the overall intent—whether it’s a prototype split for 3D printing or a final in-product assembly. And of course, using a 3D Floor Planner can help previsualize how these model alterations will affect the spatial and design coherence for interior projects.

Tips 1:

Save incremental versions of your model before making major cuts, so you can quickly revert if the outcome isn’t as desired. Additionally, frequently check the integrity of your model after each operation to avoid complications later in the design process.

FAQ

Q: Can I cut complex, organic shapes in NX, or only simple solids?

A: Yes, NX supports advanced surfacing and freeform tools, allowing you to split and trim complex shapes with surfaces, curves, and even non-planar splits.

Q: Will splitting a body in NX affect any existing features or assemblies?

A: Splitting a solid can impact downstream features, so review feature dependencies in the model tree and update any affected assemblies as needed.

Q: How do you join two parts after cutting in NX?

A: You can use Boolean “Unite,” “Bridge,” or use surface modeling techniques to blend separated parts back together seamlessly.

Q: Can I use a 2D sketch to cut through a 3D body?

A: Yes, you can extrude a 2D sketch as a “Cut” or “Trim” tool to remove material along the sketch’s path.

Q: What's the difference between Split Body and Trim Body in NX?

A: “Split Body” divides a single body into two or more parts, while “Trim Body” removes material using intersecting geometry. The choice depends on whether you want to separate or delete portions of the body.