HOME/GUIDES/KERNEL-PIPELINE/SOLIDWORKS/SIEMENS-NX

PIPELINE: SOLIDWORKS-TO-SIEMENS-NXEXCHANGE: .x_t (Parasolid Text)

SolidWorks to Siemens NX Lossless 3D Translation

Lossless 3D B-Rep translation, tolerance stitching calibration, and model healing rules for SolidWorks to Siemens NX.

TOPOLOGY RATINGB-REP EDGE STITCHINGZERO ACCIDENTAL POLYGON DEGRADATION

Geometric Interoperability Scope

Converting model from SolidWorks (Parasolid (Siemens)) to Siemens NX (Parasolid (Siemens)) introduces mathematical translation offsets. Because the source and target engines use different topological boundary representation (B-Rep) calculations, linear limits (e.g. 0.001 mm vs 0.0001 mm) and curve approximation methods differ. This mismatch causes stitched surfaces to split, holes to lose cylindrical properties, and complex fillets to disintegrate into hollow mesh shells.

Geometric Kernels Statement: Multi-CAD collaborative systems require mapping the mathematical boundaries of B-Representation solids. Gaps in translation occur when exporting topological solids without aligning local linear tolerances.

Kernel & Tolerance Specification Matrix

Software Entity	Geometry Kernel	Native Format	Exchange Standard	Linear Tolerance
Source: SolidWorks	Parasolid (Siemens)	.dwg / .sat / .3dm / .step	.x_t (Parasolid Text)	0.001 mm
Target: Siemens NX	Parasolid (Siemens)	.dwg / .sat / .step	.x_t (Parasolid Text)	0.0001 mm

Step-by-Step Resolution Blueprint

1. **Export Alignment**: In SolidWorks, use .x_t (Parasolid Text) as the exchange format. Before saving, override the default export settings to force the export tolerance down to 0.0001 mm. 2. **Topology Matching**: Ensure the exporter is set to write Solid/Sheet bodies rather than wireframe lines to prevent empty shells. 3. **Import Healing**: When importing into Siemens NX, activate the "Heal Geometry" and "Automatic Curve Stitching" options. Set the healing tolerance to exactly match 0.0001 mm to compensate for edge gaps.

Precision Calibration Script

Execute the following script inside your source CAD macro editor or script console to override default document absolute tolerances and align the B-Rep boundary curves.

Script: Calibrate_Tolerance.$py // PRECISION OVERRIDE

# SolidWorks VBA/Macro to optimize export structure for Siemens NX
# Saves active document with explicit boundary settings

import win32com.client
swApp = win32com.client.Dispatch("SldWorks.Application")
doc = swApp.ActiveDoc

if doc:
    # 1. Set export format depending on target kernel
    # Target: Parasolid (Siemens)
    # Best exchange format: .x_t (Parasolid Text)
    print("[CADGuide] Optimizing SolidWorks export settings for Siemens NX...")
    
    # 2. Reset system settings for STEP/Parasolid export
    # Force SolidWorks to export solid faces with maximum stitching
    swApp.SetUserPreferenceToggle(
        12, # swUserPreferenceToggle_e.swStepExportSolidParts
        True
    )
    print("[CADGuide] Outbound SolidWorks bodies aligned to Siemens NX standard.")
else:
    print("[CADGuide ERROR] Please open a SolidWorks part or assembly before executing.")

Software License

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