Sheet-Metal

A sheet metal enclosure for an elliptical staircase, a conical shroud split into two halves for shipping, a large cylindrical tank section cut into panels for laser cutting — these all share the same fabrication requirement: a curved sheet metal body that must be divided into manageable pieces, each with its own flattenable geometry and its own DXF. SOLIDWORKS’s Split feature appears to solve this. It doesn’t. Applied to a curved sheet metal body, Split divides the geometry but destroys the flat pattern capability on every resulting piece. This post explains why that happens and gives three approaches that actually preserve flattenability. ...

A r/SolidWorks thread from last week: user exports a sheet metal part to DXF, sends it to the laser shop, gets a call saying the file is corrupt. The file is 20MB for a bracket with three bends. The shop’s nesting software chokes loading it. The user is exporting from the drawing, not from the part. This is the most common DXF export mistake in SolidWorks, and it is invisible until something downstream breaks. ...

The SOLIDWORKS sheet metal environment has two entry points: you either start with a sketch and build the part as sheet metal from the beginning, or you convert an existing solid into a sheet metal body. The second path—Convert to Sheet Metal—is the right tool for STEP imports and inherited legacy parts with no sketches. But it fails silently on a specific class of solid bodies, and understanding why matters both for fixing production parts and for writing API macros that won’t break on edge cases. ...

A user on the SOLIDWORKS 3DEXPERIENCE forum posted a question about elliptical cutouts in a sheet metal flat pattern. After exporting the flat pattern to DXF, every elliptical hole appeared as a SPLINE entity in the file. The laser cutter’s controller — a Trumpf TruTops installation — rejected the file. TruTops can cut true ellipses from native ELLIPSE entities but has no NURBS solver for arbitrary-degree SPLINE entities, so the holes were silently dropped from the cutting plan. ...

Every sheet metal shop with more than a handful of active parts runs into the same gap. The model changes — a bend radius is revised, a hole pattern shifts, a flange length is adjusted — and the SLDDRW already has everything: dimensions, bend notes, tolerances, title block, revision table. But the DWG that goes to fabrication is still sitting at the old revision. Someone has to open the drawing, let it rebuild, and export. Every time. ...

Every nesting operator knows the moment: 200 DXF files land in an import folder named Part1.dxf, Part2.dxf, FlatPattern-3.dxf. The cut program runs. Parts come off the machine. Now someone has to match each blank to an installation slot by hand—measuring, comparing, labeling. This is a manual step that costs 30–90 minutes per nest cycle, scales with order volume, and doesn’t improve no matter how much you spend on nesting software. The root cause is a mismatch between what SOLIDWORKS produces by default and what ProNest, Lantek, and JETCAM expect in order to route parts back to their jobs automatically. ...

You receive a STEP file from a supplier or another team. It opens in SOLIDWORKS as an assembly with hundreds of sub-components. Some of them are clearly bent sheet metal parts—brackets, enclosure panels, mounting clips. Your goal is to get flat-pattern DXF files for the laser shop. When you right-click a component and look for Flat Pattern, it’s not there. SOLIDWORKS treats every STEP-imported body as a dumb solid: geometry only, no feature tree, no bend data, no flat pattern. Even if the body was originally modeled as sheet metal, none of that intelligence survives the STEP format. ...

A r/SolidWorks thread from August 2026 captures the confusion exactly: an engineer is trying to export a flat pattern DXF from a SolidWorks weldment to send to a tube laser shop. Every suggestion in the thread involves model edits, workarounds, or converting the weldment to sheet metal. Nobody points out the real issue — they are trying to apply a sheet metal export workflow to a part that belongs in a completely different machine category. ...

If bend lines stopped appearing in your DXF exports after a SolidWorks service pack update, you are not alone. The r/SolidWorks threads from August 2026 show multiple engineers hitting this after 2025 SP5 and 2026 SP3. Some had working configurations for years. They installed the update, exported a flat pattern, and the bend lines were gone. The problem is fixable — but only if you understand that bend lines disappear for fundamentally different reasons depending on how you export. Applying the wrong fix wastes time and leaves you thinking the issue is deeper than it is. ...

A SOLIDWORKS forum question asked this week: how do you model a curved sheet metal part, and do stamping structures require forming tools? The answer depends entirely on what “curved” means, because SOLIDWORKS handles three fundamentally different curved-sheet-metal scenarios with three different tools — and forming tools are a separate concern from the geometry of the base body. This post maps the decision tree. The Three Curved Sheet Metal Scenarios SOLIDWORKS sheet metal works by tracking a flat-pattern state for every feature. Every bend is stored with a radius, K-factor, and bend allowance so the flat pattern can be computed by unfolding. Curved geometry complicates this in three distinct ways: ...