A servo motor coupling that came loose after 3 months. The coupling was clamped with an M4 screw. The motor shaft was 14 mm. The coupling bore was 14 mm H7. Under load, the coupling crept on the shaft. The customer thought the set screw was loose. It was tight. The issue: H7 clearance fit …
Continue reading “Shaft Coupling Bore Tolerance: H7 vs K7 vs JS7 Fits Explained”
A V-belt drive that squealed on startup. The motor was 7.5 kW at 1450 RPM. The driven pulley was 200 mm diameter, running at 720 RPM. The belt was a standard SPA. The customer thought the belt was worn. It was new. The issue: the drive was sized for steady-state load, but the application was …
Continue reading “V-Belt Drive Calculation: Service Factor and Belt Length Selection”
A linear axis that wandered 0.05 mm at the same position. The ball rail was new. The balls were fine. The issue: the rail was installed with clearance, not preload. At low speeds, the carriage wobbled. The customer thought the balls were worn. They weren’t — the rail was selected with C0 (clearance) preload class …
Continue reading “Linear Bearing Preload: Why Clearance vs Preload Matters for Accuracy”
A bolted flange on a hydraulic line. It leaked at 70 bar. The flange was rated for 250 bar. The customer used a standard paper gasket. The system pressure was well within the rating. But the bolts weren’t torqued correctly, and the gasket was wrong for the fluid. This is how I size bolted flanges …
Continue reading “Bolt Flange Pressure Rating: Gasket Selection and Load Calculation”
A keyway on a 40 mm shaft that sheared after three months of operation. The drive was a 5.5 kW motor at 1450 RPM. The customer thought the key was made of soft material. It wasn’t — the keyway was undersized for the torque. The key was 12×8 mm (standard for 40 mm shaft), but …
Continue reading “Keyway Design Calculation: Torque Capacity of Shaft-Hub Connections”
The Machine That Was Built Before the Design Review: Why Reviews Matter A machine built by a small team. They skipped the design review (they were behind schedule). They built it. During commissioning, they found three major errors: a guard that blocked the operator’s access, a valve that was mounted where maintenance couldn’t reach it, …
Continue reading “Automation Design Review Checklist: Before You Build the Machine”
The Belt That Slipped on the Drive Pulley: Belt Tension and Crown, Not the Belt A flat belt on a conveyor. It slipped on the drive pulley. The belt ran at 80% speed under load. The customer thought the belt was worn. The belt was fine. The pulley wasn’t crowned, and the belt tension was …
Continue reading “Conveyor Belt Take-Up: Stretch Compensation, Tension and Tracking”
The E-Stop That Restarted Automatically: Safety Circuit Reset Logic, Not the Relay An e-stop button pressed. The machine stopped. Two seconds later, it restarted on its own. The customer thought the safety relay was defective. The relay was fine. The PLC logic was wrong — it automatically reset the safety circuit. This is about safety …
Continue reading “E-Stop Reset Circuit: Manual Monitored Reset and Safety Monitor Relay”
The Touchscreen That Was Too Small for the Operator: HMI Sizing for the Shop Floor A 5-inch HMI on a machine. The operator stood 1.5 m away. He couldn’t read the fault messages. The buttons were small — he pressed the wrong one. The customer asked for a bigger screen. This is about HMI sizing …
Continue reading “HMI Selection Guide: Screen Size, Glove Touch, Protocol and Mounting”
The Indexing Table That Overshot Every Cycle: Acceleration Tuning, Not the Table A pneumatic indexing table rotating 90° every cycle. It overshot by 5 degrees every time. The customer thought the table was worn. The table was fine. The pneumatic motor was accelerating too fast. It didn’t decelerate at the end of travel. This is …
Continue reading “Pneumatic Rotary Index Table: Kinetic Energy, Sizing and Stop Design”
The Robot That Couldn’t Reach the Conveyor: Work Envelope and Layout, Not the Robot A 6-axis robot picking parts from a conveyor. The conveyor was placed at the edge of the robot’s work envelope. The robot could reach, but it was at the wrist joint’s extreme angle. The wrist twisted. The path was awkward. The …
Continue reading “Robot Cell Layout: Work Envelope, Reach Margin and Safety Distance”
The Vision System That Couldn’t Read the Label We set up a camera to read a barcode on a shiny metal part. The camera worked on a flat sample. On the actual parts (which had a machined, reflective surface), the barcode image was washed out — glare from the overhead light. The camera saw a …
Continue reading “Vision Lighting: Light Type, Color, Strobe and Glare Control”
The Diverter That Jammed the Boxes We built a diverter (a pop-up arm) on a roller conveyor. It pushed boxes from the main line onto a side spur. On the bench, it worked. On the floor, the boxes jammed — the diverter arm hit the box’s bottom flap. The problem: the diverter was a flat …
Continue reading “Conveyor Diverter Selection: Product Routing, Timing and Sensor Design”
The Pallet That Wouldn’t Locate on the Return Conveyor: Palet Stop and Docking, Not the Conveyor A pallet on a return conveyor. It arrived at the workstation but didn’t locate — it stopped 20 mm short. The operator had to push it manually. The customer thought the conveyor was misaligned. The conveyor was fine. The …
Continue reading “Circulation Pallet Design: Locating Pins, Orientation and Lift Stations”
The Rivet That Wasn’t Setting Properly: Rivet Gun Setup, Not the Rivets A pneumatic rivet gun setting blind rivets. The rivets weren’t flaring properly — some were loose, some were over-set. The customer thought the rivets were defective. The rivets were fine. The gun wasn’t adjusted. This is about rivet gun setup, not about the …
Continue reading “Pneumatic Press Design: Riveting Force Curve, Cylinder Sizing and Monitoring”
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Everything you need to know about designing efficient and reliable conveyor systems
