# Engineering samples Open FormulaCAD Files, select Samples, then double-click a sample. The engineering examples appear together at the beginning of the existing list. Select a sample and choose Read Guide to read its notes. FEM and CAM run in Windows; the web gallery shows their model companions and drawing examples only. ## Keep companions together Drawing, continuum FEM and CAM files use #refer to read a nearby design file. Copy the entire engineering folder to a writable working folder before experimenting. Open your copied files using Open File. Saving just a study under another name does not copy its referenced design automatically. Member-only FEM examples need no companion. Build the design first if it is open in another tab. A study uses its current build; if the design is closed, FormulaCAD builds its saved source. After editing a design or study, build again. Historical cached output is useful for viewing but is not permission to export current results. ## Suggested route 1. CurveConstruction.fcl2d: line, arc and circle construction. 2. EdgeFinish.fclpart, NumericEdge.fclpart and FaceScopedFinish.fclpart: solid finishing and topology selectors. Inspect before and after a parameter change; topology indices can change. 3. InspectionFixture.fclasm: repeated instances and tree selection. Selecting an occurrence should highlight that occurrence, rather than every copy of a definition. 4. DrawingFixture.fclasm and DrawingFixture.fcldraw: the assembly, an overview sheet and detail views. Build the drawing and switch sheets. Select a view node, then its annotation child. Positions inside view/endview are local paper units; view scale affects projected model geometry. A workpoint projects a named geometry point; the dimension retains the model measurement. The definition parameter names the authored FCL definition, not a generated block name. Export SVG/PDF for viewing or DXF/DWG for CAD exchange. 5. AxialTruss.fclfem, Frame2D.fclfem and Frame3D.fclfem: member analysis, then bending and torsion. Continue with Plate.fcl2d/Plate.fclfem and Bracket.fclpart/Bracket.fclfem. Read FEM-Getting-Started.md. 6. PocketBlock.fclpart/PocketBlock.fclcam, InsideProfile.fclcam, PocketIsland.fclpart/PocketIsland.fclcam, then RodCap.fclpart/RodCap.fclcam. Read CAM-Getting-Started.md. ## Files and inspection The extension chooses the workspace: .fclpart is a solid model, .fclasm an assembly, .fcl2d a planar model, .fcldraw a drawing, .fclfem an analysis, and .fclcam a machining study. #Env must agree with it. The output tree describes the build. Select geometric nodes to highlight them and inspect identity and properties. Some construction or consumed features have no surviving display entity; that is different from a failed build. Read build diagnostics when output is missing. Do not infer correctness from a colored viewport alone.