A Ø50 cylinder, 500 mm stroke, pushing a 200 N load horizontally. It didn’t push — the rod bent. The customer thought the cylinder was weak. It wasn’t. At full extension, the rod was like…
A timing belt drive between a servo motor and a ball screw. The belt slipped under acceleration. The customer had installed a 2:1 reduction but the belt was the wrong width. The motor was 750W,…
A VFD (variable frequency drive) in a sealed electrical cabinet. It tripped on over-temperature every hot afternoon. The cabinet was 600×800×300 mm, sealed, with the VFD dissipating 120 W. The customer thought the VFD was…
I was reviewing a welded frame last week. The engineer had used a 50×50×3 mm square tube as a crossbeam spanning 1.5 m, carrying a 100 kg axis at center. He said “it’s square tubing,…
A servo axis that buzzed and oscillated at low speed. The motor was 400W, the load was a 20 kg slide on a ball screw. The drive tuned fine at high speed. At 10 mm/s…
A timing pulley pressed onto a shaft. It slipped under load after two months. The press fit was supposed to hold. I’d specified H7/p6 — a standard interference fit. But I’d never calculated the actual…
A customer called me last week. “My cylinder won’t push the slide. I turned the air up to 8 bar and it still stalls.” I asked him what bore it was. “Ø32.” I asked what…
A profile rail on a reciprocating axis. It failed after 8 months. The customer said it was too cheap. It wasn’t cheap — it was a standard 25 mm rail from a reputable maker. The…
I watched a mechanic torque an M8 bolt to 25 N·m with a wrench. “That’s standard,” he said. I asked him what preload that gave him. He shrugged. I don’t blame him — torque wrenches…
Last month I was building a weld fixture. The arm was 300 mm long, Ø25 mm steel, holding a 15 kg part at the tip. I drew it up, sent it to the shop, and…
The Line Where One Operator Was Always Behind A manual assembly line had five workstations. The tasks were divided by part (Station 1: left side, Station 2: right side, and so on). After two weeks,…
The Air Compressor That Ran All Night for No One A customer’s compressed air system ran every night, even though production stopped at 6 p.m. The production manager said, “The machine needs air to hold…
The Vision System That Took a Picture and Never Finished A customer installed a vision inspection station on a high-speed line. The camera triggered on a photoeye. The inspection (a pass/fail on a label) was…
The Cylinder That Slammed Into Its Stops A pick-and-place cylinder extended at full 6 bar pressure. The customer wanted it faster. They opened the flow control all the way. The cylinder shot across 200 mm…
The Rework Batch That Jumped the Queue A customer ran a production cell that had to maintain FIFO (first-in, first-out) — the first part loaded had to be the first part unloaded. It was a…
