can someone please help with hole dimensions

[JAZZCNC]

Shoulder screws are ground to specs, so a 12mm shaft shoulder screw is 12.00mm, see picture below. So i just drill a 12mm hole with a good new Dormer drill bit.

You having a laugh.!! Drills are about much good at making accurate holes as I am at pole dancing.!! The whole point of Shoulder bolts is precision and this requires reamed holes.

I've not commented here because Ash has been in touch via email so I've told him this already but I'll repeat again here for the sake of others reading this who are just thinking about building.!

At DIY level building in lots of adjustment at the start is priceless when the machine built and your setting up chasing accuracy etc.
With all the best will in the world and careful marking etc there is point that without High precision machinery to help with build then your always going to need adjustment or wiggle room.
This doesn't mean high accuracy can't be achieved at DIY level it just takes lots of time and patience.