Fabricating With Bearing Question

[average guy]

have to get up to speed on bearings
building one off hubs
using timken type bearings
what's the correct name for the
bore the backside of bearing goes into?
same question for shoulder that keeps
bearing from going into tube?

 

[average guy]

i did some research on this at wikipedia under 'Tapered Roller Bearings'
'The non-separable inner ring and roller assembly is called the cone, and the outer ring is called the cup'
plan is to machine shaft for a bearing to fit in each end
and stay there
what is a good all round aluminum to use for this?
about 2" diameter tubing with enough wall to machine
to hold bearing cup