The author build a motorized router table so he doesn’t have to manually adjust it up and down. He is using an arduino for the controller with a displace and a DC motor to do the up/down. I have watched folks manually adjust there tables, so this is a huge step up.
http://hackaday.com/2015/02/10/a-router-table-with-height-control/
http://hiramhouse.blogspot.be/p/v-behaviorurldefaultvmlo.html