What line thickness for CAD drawings?

So on my first day at work as a trainee draughtsman I’m shown my drawing board and seat. Behind the seat is a desk where upon lays some drawing implements. There’s a T-square, protractor, a few technical pencils, a rubber, erasing shield, ruler, compass, some circle...

Paper space or model space in AutoCAD

Back in 1993 the company I worked for invested in their first workstations with AutoCAD R12 installed, this was MSDOS based as opposed to Windows. The company designed ground support test equipment for aircraft and was keen to explore all the advantages that CAD had...