The Pallet That Collapsed Halfway Through the Stack A robot palletizer picked cases from a conveyor and stacked them on a pallet. The pattern was a simple grid (2×3 per layer). On the floor, the stack leaned and toppled after 4 layers. The problem wasn’t the robot path — it was the case weight distribution. …
Continue reading “Palletizing Cell Design: Patterns, EOAT, Robot Reach and Safety”
The Label That Peeled Off After a Week We applied a label to a plastic housing with a labeling machine. The label went on straight, the date code printed correctly. A week later, the customer reported the labels peeling off at the edges. The problem wasn’t the label machine — it was the surface. The …
The Weldment That Bent After Welding We built a welding fixture for a steel frame. The frame was clamped in the fixture, and the robot welded all four sides. When we unclamped it, the frame had twisted by 3 degrees. The welds pulled the frame as they cooled — the residual welding stress distorted the …
Continue reading “Welding Fixture Design: Datums, Clamping, Positioners and Weld Sequence”
The Shaft That Bent Under the Slides We used a 12 mm hardened linear shaft supported by pillow blocks every 500 mm. A slide moved along it carrying a 5 kg load. The customer reported the slide stuck at one point along the travel. We checked — the shaft was bowed in the middle. The …
Continue reading “Linear Shaft Design: Support Spacing, Bushings vs Profile Rails, Deflection”
The Cylinder That Seized After Three Months A pneumatic cylinder on a pick-and-place station started sticking. It moved fine for a month, then began to hesitate. The customer thought the cylinder was worn. We checked — the inside of the cylinder had rust. The compressed air supply was wet. The FRL (filter-regulator-lubricator) was sized correctly, …
Continue reading “Pneumatic FRL Design: Air Preparation, Dryers, Filters and Compressor Sizing”
The Conveyor That Walked Off the Frame We installed a flat belt conveyor 3 meters long. On the bench, it tracked straight. On the floor, within a day, the belt had drifted to the side and was rubbing the frame. We adjusted the tail pulley — it tracked for an hour, then drifted again. The …
Continue reading “Belt Conveyor Design: Tension, Tracking, Crowned Pulleys and Belt Types”
The Machine That Passed FAT and Failed SAT We built an assembly machine. The FAT (factory acceptance test) at our shop went perfectly — it ran 8 hours straight at the design cycle time, all stations passed, the customer signed off. Two weeks later, at the customer’s plant (SAT), the machine didn’t run right. The …
Continue reading “FAT SAT Process: Factory Acceptance Test, Site Acceptance and Machine Handover”
The Encoder That Lost Position Every Power Cycle A servo axis used an incremental encoder. Every time the machine was powered down and back up, the axis had to home — the drive didn’t know where it was. The homing routine took 10 seconds per axis. With four axes, every startup was 40 seconds of …
Continue reading “Encoder Selection: Absolute vs Incremental, Resolution and Direct Feedback”
The Fence That Didn’t Stop the Operator A robot cell had a fence around it. The fence was 2 m high, steel mesh, bolted to the floor. But the gate in the fence didn’t have an interlock — it had a simple latch. The operator could open the gate, reach into the cell to clear …
The Press-Fit That Cracked the Housing We press-fit a bearing into an aluminum housing. The spec said 5 kN press force. We used a pneumatic press set to 5 kN. Some housings came out fine. Others cracked. The problem wasn’t the press force — it was the pneumatic press’s force spike. Pneumatic cylinders hit the …
Continue reading “Press-Fit Process Design: Servo Press, Riveting Methods and Force Monitoring”
The Axis That Couldn’t Accelerate Fast Enough A customer needed a pick-and-place axis: 500 mm travel, 15 kg payload, move in 0.8 seconds. We specified a ball screw with a servo motor. The simulation said it should work — the screw was sized for the load. On the floor, the axis took 1.4 seconds, not …
Continue reading “Linear Motor vs Ball Screw: Acceleration, Speed, Cost and Critical Speed”
The Light Curtain That Stopped Production Every Shift A customer had a robot cell with a light curtain at the part loading opening. The operator loaded blanks every cycle. Every time the operator reached in, the light curtain tripped and the robot stopped. The cycle time was 6 seconds. The operator took 4 seconds to …
Continue reading “Light Curtain Muting Design: Sequential Sensors, Bypass and Safety Distance”
The Enclosure That Rusted After Three Months of Washdown We built a machine for a food packaging customer. The spec said “washdown environment.” We put the electronics in a standard painted steel enclosure with a rubber gasket. After three months of daily high-pressure washdown, the enclosure had rust spots along the bottom edge. The gasket …
Continue reading “Enclosure IP Rating Design: Washdown, Gaskets, Drainage and Stainless Steel”
The Coupling That Introduced More Error Than It Fixed We coupled a servo motor to a ball screw with a jaw coupling. The application needed ±0.02 mm positioning. The jaw coupling was rated for the torque, but it had about 0.5° of backlash. At the screw end, that 0.5° translated to 0.05 mm of lost …
Continue reading “Shaft Coupling Selection: Bellows, Jaw, Disc and Misalignment for Servo Axes”
The Vacuum Gripper That Dropped Every Third Part A pick-and-place station used a Venturi vacuum ejector to pick up plastic trays. On the bench, it held. On the floor, it dropped every third cycle. The customer thought the vacuum cup was worn. We checked the cup — it was fine. The problem was the ejector: …
Continue reading “Vacuum System Design: Ejector Sizing, Cup Selection and Multi-Cup Grippers”
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Everything you need to know about designing efficient and reliable conveyor systems
