Classic/Antique Car Repair: Crankshaft bearing sizes, british engines, shop operator

Question
I am very new to automotive repairs and hope you can enlighten me with some information. The first under-size bearings for most American and British engines is referred to as 0.010 in the repair manuals. Does this mean 0.010" will be ground off from the crankshaft journals plus a further clearance between the bearing shells and the crank pin journals? How will the machine shop operator know the amount of metal to be ground off the journals or do we have to provide him with the original dimension of the crank pin journals in the first place if the engine is new to him?

Answer
A good automotive machinist will have a complete list of specifications to go by. And yes a .010" specification means that the inside diameter of the bearing is .010" under size or less in diameter. If the engine is new to him and you have the manuals and specifications then provide him with them.