Currently scratching my head about gauging shaft diameters. I highly doubt I'll be going for something exotic like titanium - probably more likely to stick with a tool steel or other similar engineering grade.

Naturally the larger the diameter the better but I'm struggling to figure out where it just becomes excessive. I was looking at 25mm (1") for drive elements and 50mm for the lifter shaft I'm working on.

How do you all gauge it?