The Proximity Switch That Chattered: Snubber and Hysteresis, Not the Sensor A proximity sensor detecting a metal target. The PLC input flickered (on-off-on-off) as the target approached. The customer thought the sensor was failing. The…
The Bolt That Snapped (Wrong Grade) We bolted a bracket (a load) to a machine. We used a standard bolt (grade 4.6, low strength). On the floor, the bolt snapped (the load vibrated, the bolt…
The 3D-Printed Bracket That Broke (Weak Layer) We 3D-printed a bracket (a FDM print, PLA plastic). The bracket held a sensor (a light load). On the floor, the bracket broke (it snapped at a layer…
The Part That Was Too Expensive: Machined vs Cast, Design for Manufacturing A machined aluminum bracket. It cost $120 to make. The customer wanted 500 units. The part was a simple L-bracket with 4 holes….
The Powder Coat That Chipped: Surface Prep, Not the Paint A welded frame powder-coated. The paint chipped off at the edges within a month. The customer thought the powder coat was bad. The powder coat…
The Anodized Part That Changed Color (Hard Anodize) We anodized an aluminum bracket (a Type II anodize, the standard). On the floor, the part was a nice color (black). But a second batch (a different…
The Welded Frame That Bent: Weld Distortion, Not Material Failure A welded steel frame. It came out of the welding shop twisted. The customer thought the steel was weak. The frame was 50×50×5 mm square…
The Seal That Leaked: Surface Finish, Not the Gasket A face seal on a hydraulic manifold. It leaked. We replaced the O-ring. Still leaked. We replaced the gasket. Still leaked. The mating surface was machined…
The Part That Didn’t Fit: Tight Tolerance, No Need A machined part with a hole tolerance of ±0.01 mm. The part was a cover plate on a machine. It just sits there. The customer had…
The Sheet Metal Part That Cracked (Sharp Bend) We designed a sheet metal bracket (a laser-cut, bent plate). The bend was a 90° (sharp, inner radius = 0). On the floor (after bending), the part…
The Frame That Wobbled: Aluminum Extrusion Sizing, Not a Defect A 40×40 aluminum extrusion frame for a machine. It wobbled under load. The customer thought the extrusion was defective. The wall thickness was 2 mm…
The Poka-Yoke That Caught the Missing Screw: Detecting, Not Relying on the Operator An assembly station where the operator installed 4 screws. Sometimes he missed one. The product shipped. It came back. We added a…
The Operator Who Made Mistakes: Aids and Cues, Not Training An operator loading parts into a fixture. Every 50 cycles, he loaded a part backward. The machine ran, but the part was wrong. We trained…
The Packaging Line That Jammed: Mismatched Boxes, Not a Conveyor Fault A packaging line folding and sealing cardboard boxes. It jammed every 20 minutes. The boxes came from a supplier. Some were the wrong size….
The Recall That Needed Data: Traceability, Not a Quality Issue A batch of parts came back from the field — a batch of 500 had a missing screw. The customer needed a recall. But the…
