The Axis That Wouldn’t Tune Stiff: Why the Loop Gain Isn’t the Limit A positioning axis that felt springy. When you pushed on the carriage by hand, it moved 0.3 mm and sprung back. The…
The Belt That Walked Off the Pulley: Conveyor Tracking, Step by Step A flat belt conveyor, 2 m long, carrying small plastic parts. The belt drifted to the left over about an hour. By the…
The Cylinder That Slammed Home on Air-Up: End-of-Stroke Cushioning A Ø80 mm cylinder, 500 mm stroke, pushing a heavy slide. When it reached end-of-stroke, the slide slammed hard. The machine rattled. After two weeks, the…
The Cup That Leaked on a Round Can: Vacuum Cup Geometry, Not Size A flat vacuum cup (Ø50 mm) trying to lift a round aluminum can. The cup flattened on the top of the can…
The Bracket That Cost 3x to Machine We designed a bracket for a sensor. The part had a deep pocket (50 mm deep, 10 mm wide) with a 0.5 mm internal fillet. On the drawing,…
The Robot That Faulted Under Load We mounted a gripper on a 6-axis robot. The payload spec said “10 kg.” The gripper + part weighed 8 kg (under the 10 kg). On the floor, the…
The Compressor That Couldn’t Keep Up: Calculating Air Demand, Not Guessing The plant air pressure dropped every time a new machine cycled. The compressor ran constantly but couldn’t maintain 6 bar. The customer thought the…
The Sensor That Read 0.05 mm Differently Every Time: Repeatability vs Accuracy A laser displacement sensor measuring part height on a check station. The same part, measured 10 times, gave 10 readings: 12.00, 12.03, 11.98,…
The Guard That Cracked When a Part Flew Out: Impact Resistance, Not Decoration A machining cell with a clear polycarbonate guard. The door was 5 mm thick, bolted in an aluminum frame. A broken tool…
The Axis That Overshot Every Move: Settling Time, Not Tuning A positioning axis on a dispensing machine. Every move, the carriage overshot the target by 0.2 mm, then settled back. The settle time was 200…
The Screw That Whined at 3000 rpm: Ball Screw Noise, Diagnosed A rolled ball screw, Ø25 mm, 10 mm lead. At 1000 rpm it was quiet. At 3000 rpm it whined — a high-pitched tone…
The Motion That Jittered at High Speed: Servo Tuning, From Symptom to Fix A linear axis on a gantry. At low speed (100 mm/s), motion was smooth. At 500 mm/s, the carriage vibrated — a…
The Coupling That Failed in 30 Days: Misalignment, Not Torque A servo motor driving a ball screw through a jaw coupling (aluminum hubs, polyurethane spider). After 30 days, the spider cracked. The motor lost torque…
The Vacuum That Lost Grip After Lunch: Degradation Over a Shift A vacuum gripper running a 3-shift cell. Morning shift: perfect. Afternoon shift: dropping parts. Night shift: nothing holds. The customer thought the cups were…
The Relay That Welded Its Contacts: Sizing a Relay for an Inductive Load A 24 V DC relay switching a solenoid valve coil. The relay closed, the valve clicked, the relay contacts welded shut. The…
