There is a FAG cataloge that may be of interest to you, it details a number of bearing and seal applications. These include:
1. Drilling and Milling Spindle
2. NC-lathe main spindle
3. CNC-lathe main spindle
4. High speed motor milling spindle
etc...
The title is "The design of rolling bearing mountings"
Publication No. WL 00 200/5 EA
This will give you an idea of some of the designs as well as bearing and seal arrangements.
Greg