In the 1980's Tim Hunkin made several series of excellent programmes looking at how everyday machines were designed and built.
Having had a browse on YouTube, I found several episodes that I hadn't seen before.
Here's something to get you started! https://www.youtube.com/watch?v=6S-rTfHiGv4 Called "Why Things go Wrong" which looks at the reliability of machines.
Enjoy,
Clive