Part 14 - Plating
Channel: Eurocircuits
Date: 2014-05-08

Next we electroplate the boards with copper.  The operator loads the panels onto the flight bars.  He checks all the clamps to ensure a good electrical connection.  The panels themselves act as cathodes for electroplating and we can plate the hole walls thanks to the conductive carbon layer already deposited there.  The operator starts the automated plating line.  The copper surface of the panels is cleaned and activated in a number of baths and then electroplated.  .  The whole process is computer controlled to ensure that each set or flight of panels stays in each bath exactly the right amount of time. 

http://www.eurocircuits.com/index.php/making-a-pcb-eductional-movies/44-plating