Rockwell_Delta_Drill_Press_20-421_parts_breakdown.jpg
and
Rockwell_20''_ drill_press_1816 parts breakdown.pdf

The title of the photo says it all.  
The jpg file is the just the head diagram without the sheets that go with it describing the different numbered parts.
The pdf file is the complete machine and includes the pages with the names of the numbered parts.


Bearing replacement discussed in rec.crafts.metalworking  Nov 2009