How to Do a Miter Flange in SOLIDWORKS

A miter flange in SOLIDWORKS creates sheet metal flanges along one or more edges using a sketched profile. It is useful for trays, covers, pans, enclosures, and sheet metal parts that need connected flanges around corners.

Start with a sheet metal base

Create or open a sheet metal part before adding the miter flange. The base flange should have the correct thickness, bend radius, and sheet metal settings. These values affect the flange and the final flat pattern.

If the part was modeled as a normal solid first, convert it to sheet metal before relying on flat patterns or bend information.

Confirm that the fixed face and bend settings are correct before adding more flange features. A small setup error early in the sheet metal model can affect every later bend and flat pattern.

Create the flange profile

The miter flange uses a sketch profile to define the flange shape. Sketch the flange cross-section on a plane or face that makes sense for the selected edge. Keep the profile simple and dimension it clearly.

The profile should represent the flange wall, not the entire finished part. A clean sketch makes the feature easier to edit and helps avoid flat-pattern problems.

Keep the sketch connected to meaningful references. If the profile is positioned with weak or accidental relations, the flange can move unexpectedly when the base part changes.

Select edges for the miter flange

After starting the Miter Flange command, select the edges where the flange should be applied. SOLIDWORKS can continue the flange around connected edges, which is useful for rectangular trays and covers.

Watch the preview at corners. The corner treatment should leave a manufacturable gap or relief instead of overlapping sheet metal.

For multi-edge flanges, select edges in a logical order and inspect each corner. Corner conditions are often where sheet metal features fail or create geometry that cannot be formed cleanly.

Set position and relief options

Flange position controls how the sketch is located relative to the selected edge. Relief and corner options affect how the sheet metal unfolds and how corners are cut. These settings should match the fabrication method.

For production sheet metal, use shop standards for bend radius, relief, and gap. A flange that looks fine in 3D may still be difficult to bend if relief is too small.

Material thickness matters here. A relief that works on thin sheet may not work on thicker material, and the required bend radius may change with the process and tooling.

Check the flat pattern

Flatten the part after creating the miter flange. Check that bend lines, relief cuts, and corner gaps appear correctly. If the flat pattern fails, the flange profile, edge selection, or corner options may need adjustment.

Also check whether the flange collides with nearby features when folded. Holes, tabs, and adjacent walls can create manufacturing or assembly issues.

Troubleshooting

If the miter flange fails, simplify the profile and apply it to fewer edges first. If corners overlap, adjust relief, gap, or selected edges. If the flat pattern is wrong, review sheet metal parameters and rebuild the part.

Use miter flanges for clean, repeatable sheet metal edges, but verify the finished geometry in both folded and flat states. The flat pattern is the most important check before sending the part to fabrication.

Document material, thickness, bend radius, and revision on the drawing or flat pattern export so the model can be manufactured consistently.

If the flange is part of a formed enclosure, check mating covers, fasteners, and clearances in the assembly. A correct flat pattern still needs to fit the product when folded.