How do you get Ball bearings into certain kinds

Hi all,

Please consider the diagram of a crossection of a ball bearing assembly (hopefully it makes sense!!) below which I have seen in bearing catalogues (eg Kaydon): ________________________________ I I I _ - - _ I I * * * * ___I____Outer Race I * * * * I I * * * * I I / / \ \ I I__/ / \ \__I I ____I___________Ball Bearing(s) __ I I __ I \ \ / / I I \ \ / / I I * * * * I I * * * * __ I_________ Inner Race I * * - _ _ - * * I I I I________________________________I

BEARING ASSEMBLY CROSSECTION

Assuming the crossection of the outer race and inner race is the same for 360 degrees around (a horizontal axis below the inner race) and there is a full complement of bearings-

when assembling bearings how do you get all the ball bearings past the walls of the inner race and outer race and into the middle running area shown above?

I am asking because I am planning on machining my own bearings for a project (bearing size 1.5mm, Total crossection width= 2.5mm)

If I missing something please let me know

Many thanks,

Steve