Modeling Enclosures: Verify Wall Thickness Early

When designing enclosures, wall thickness is a critical parameter that affects strength, manufacturability, and cost. Many engineers model the overall shape first and forget to verify uniform thickness until after tooling design begins. This leads to costly revisions.

The most reliable check is to use your CAD software's wall thickness analysis or offset command. Create an offset surface of the outer shell inward by the nominal wall thickness. If that offset surface intersects the internal geometry, the wall is too thin in those areas. If it leaves gaps, the wall is too thick.

Another simple method is to cut a cross-section through the enclosure and visually examine the material distribution. You can also use a draft analysis tool to ensure consistent wall thickness and proper draft angles for molding.

Make this check early in the design, after every major feature change. A few minutes at the CAD station saves hours of troubleshooting later. Remember that ribs and bosses also need proper wall thickness ratios to avoid sink marks. Keep them around 40-60% of the nominal wall.

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