News

Back pressure is a reading taken at a plane with a damped instrument, not an attribute of a pipe. This separates mean restriction from wave timing, why a larger system can cost torque, and why a tailpipe gauge describes the wrong end of the car.

Straightening works by shrinking the long side, and the shrink happens on cooling. What spot and wedge heating do, and why titanium and heat treated aluminium refuse the method.

A weldment has a stack-up term that never appears on the drawing. How shrinkage, sequence and datum choice move the error, and where tolerance is worth spending.

A cone is a flat pattern before it is a shape, and the blank is not a trapezium. How a frustum unfolds, why cone rolling differs from cylinder rolling, and what the seam decides.

Stainless fails a drill for two reasons that feed each other. Why rubbing rather than cutting starts work hardening, and what feed, point geometry and coolant change.

Two round tubes cannot meet on a square cut. What the saddle curve is, how diameter ratio and angle set the profile, and why fit-up decides whether a joint can be welded.

Every exhaust changes bore somewhere. How the included angle decides whether flow stays attached, when eccentric beats concentric, and where a weld in the path hurts most.

A burr is a notch waiting for a reason to crack. How each cutting process makes its own burr, why a sharp edge breaks the passive film, and what an edge break really means.