I assure you, the machinery is pretty damn standard on the whole Earth.
For example, the US auto industry has mostly moved to metric for designing new cars.
From what I've heard, the vast majority of civil and structural engineering in the US is still on customary. (A few state highway departments tried to move to metric, but actually ended up moving back, since using metric when the rest of the industry was still on customary was costing them more money.)
US aerospace is still mostly customary, but NASA has been encouraging greater use of metric in space applications (due to the Mars Climate Orbiter debacle). And you'll notice SpaceX's webcasts all have metric units for telemetry – I believe SpaceX prefers metric wherever possible.
The funny thing is looking back at Apollo documents from the 60s is that many of those were in SI, but for Shuttle they appeared to have switched the launch and land portion fully to English.
Actually, many planes support displaying metres for altitude as well as feet. This is because, while most of the world uses feet for altitude, a handful of countries (China, North Korea, some ex-Soviet states) use metres instead. On an international flight, pilots can even change the units displayed on their instruments as they pass from non-metric airspace into metric airspace and vice-versa.
You can see some of the approaches here: https://www.thorlabs.com/tutorials.cfm?tabID=4068826A-1CD4-4...
(I work with CNC and I spend much of my day converting between inch and mm).