Why I stopped trusting “just make it H7” I’ve been specifying fits on rotating assemblies for close to twenty years, and the thing that still surprises me is how fast smart engineers reach for H7…
1. Listening to the Machine Every structure has a voice, the set of frequencies at which it rings when it is struck, and the engineer who understands that voice can fix a vibrating machine, isolate…
1. Two Ways to Turn the Corner Machinery rarely aligns its shafts in a straight line, and the drive that connects a crossed pair of shafts, one turning the other at ninety degrees, is one…
1. The Air That Works Pneumatics moves the world’s lightest load with the world’s most available medium: compressed air. A pneumatic system takes the atmospheric air, compresses it in a central compressor station, stores it…
1. The Cylinder That Carries the Load The hydraulic cylinder is the muscle of the machine: it turns the pressure of the hydraulic fluid into a straight-line force and a controlled motion, pushing a press…
1. Programming the Robot Before the Robot Exists A robot program is a sequence of targets, each a position and orientation of the tool, linked by motions, guarded by signals and wrapped in logic, and…
1. The Rhythm of the Line An assembly line is a promise about time: every station must finish its work in the same interval, so the product can move from station to station without waiting…
1. Heat Is the Motor’s Payload An electric motor converts electrical energy into mechanical energy with an efficiency that is never a hundred percent, and the difference, the loss, appears as heat inside the machine….
1. From Profiles to Motion Cycles A cam is a machine agreement: the rotating profile agrees to push the follower through a prescribed displacement while the follower agrees to stay in contact and give the…
1. The Tooth as a Contact Pair A gear pair transmits power through line contact between tooth flanks, and the contact between two convex rolling surfaces is the most loaded small area in the machine….
1. From Drawing to Measurement Plan A coordinate measuring machine does not measure parts, it measures points, and the quality of a measurement program is decided before the first probe touch in the planning that…
1. Why Threaded Joints Fail Every bolted joint is a spring, a screw acting as a tension spring clamped against the compressed parts. The engine of the bolted joint world has understood this for over…
1. The Valve as a Controlled Orifice A valve is an adjustable orifice placed in a pipe. It stops flow, allows flow, or regulates flow by varying the size of the passage, and the way…
1. The Two Families of Pumps A pump exists to move a fluid from a lower pressure or elevation to a higher one, and the way it does that splits the entire industry into two…
1. Springs Fail in Fatigue Springs recover their shape, and that recovery is what makes them useful, but each deflection cycle also works the material. A spring in a valve, a clutch, a shock absorber…
