CAD Model Quality Control

I’ve reviewed CAD that looked flawless: ✔ Fully constrained ✔ No rebuild errors ✔ Everything aligned and clean But dig deeper—and you find: ▸ Bolts that can’t be reached ▸ Tolerances that stack the wrong way ▸ Interferences that don’t show until it’s too late ▸ No plan for fixturing, welding, or inspection That’s the illusion of clean CAD: When a model looks “done” but was never engineered to work. CAD is visual. But manufacturing is physical. If your design hasn’t been pressure-tested in the real world, then all that perfection is just a false positive. Don’t let visual clarity hide mechanical risk. Ever caught a "clean" model that nearly became a costly mistake? #engineering #cad #designreview #productdevelopment #solidworks #solidedge #projektdesign #dfm #mechanicalengineering #manufacturing

I'm building a Yes/No checklist for reviewing parting line quality at the virtual stage using some guides what I could find online. What critical questions do you use in CAD or CAE reviews to ensure high perceived quality before tooling is cut? [A] DESIGN INTENT ☐ Is the parting line located in a low-visibility or subordinate zone? ☐ Has the parting line been reviewed against customer PQ zones (e.g. touch points, line of sight)? ☐ Has the parting line been symbolised using ISO 10135 for clarity in functional vs subordinate zones? ☐ Are parting line tolerances and maximum acceptable offset defined in CAD drawings? [B] TOOL DESIGN & MACHINING STRATEGY (DIN 16742 Focus) ☐ Are centering and clamping features defined to prevent tool offset? ☐ Are mechanical tolerances of mating components within spec to avoid visible mismatch? ☐ Are guide surfaces created in CAD near parting edges to control CAM strategy? ☐ Does the CAM strategy use side-of-tool cuts along the parting line (not the tip)? ☐ Are toolpaths extended in X, Y, and Z beyond the parting line to prevent roll-over? ☐ Was a toolpath simulation reviewed for mismatch, flash, or stepped edges? [C] DRAFT ANGLE & DEMOULDING VALIDATION ☐ Is the draft angle in the parting line region ≥ recommended draft° for textured surfaces? ☐ Has the draft direction been aligned with parting plane to avoid drag marks? ☐ Was the draft orientation validated in Moldflow or virtual DFM tool? [D] TEXTURE STRATEGY ☐ Is the parting line placed where texture or graining can mask it (e.g., grain wrap-around)? ☐ Has a surface finish specification (e.g., VDI, SPI, or Etching No.) been defined near parting? ☐ Is the graining split strategy discussed with the toolmaker to avoid visible boundary lines? ☐ Has the texture flow been checked for uniformity and avoidance of sudden transitions? Please, Let me know what I’ve missed 👇

You’ve heard it. You’ve probably said it. “It looks fine in CAD.” But here’s the thing, tolerance issues rarely show up in CAD. They show up on the assembly line, when things don’t line up the way you thought they would. One of the most common traps I see: assuming a clean model means the part will be made correctly to form, fit, and function. Drawings carry intent. And intent requires clarity, which is a step beyond just pretty geometry. You need clean datums. And tolerances that reflect how the part interacts in the real world. The best engineers I know don’t just “clean up” their drawings. They think in terms of process risk, and use GD&T to control it. Stop reordering parts and let’s hit that deadline together! What’s one tolerance or drawing mistake you’ll never make again?