home-brew CNC lathe

Hi,

Been browsing thro the photo album and came across this:

home-brew CNC lathe

http://photos.groups.yahoo.com/group/cad_cam_edm_dro/lst?.dir=/Home-
brew+CNC+lathe&.src=gr&.view=

PET-Controlled X-Y PCB-Drill

http://photos.groups.yahoo.com/group/cad_cam_edm_dro/vwp?.dir=/Home-
brew+CNC+lathe&.src=gr&.dnm=PET-Controlled+X-Y+PCB-
Drill.jpg&.view=t&.done=http%
3a//photos.groups.yahoo.com/group/cad_cam_edm_dro/lst%3f%26.dir=/Home-
brew%2bCNC%2blathe%26.src=gr%26.view=t

How are the moving parts driven? There don't seem to be a mean for
driving the table/saddle.