Homebrew PCBs

Hi Phil


some time ago I visited a large SMD assembly house, 
and I remember the guy touring us  mentioning that the ovens   
( quite a few 3 metters long ) were the card is soldered when
 traveling inside it, has a totally controlled, very sharp and 
fast heating and latter cooling, that should follow some rigid 
temperature curves in order to preserve the components.

I am looking for this information before deciding to go on on the project.

regards

jjose