I have seen this height probe sensor :
http://www.boenigk-electronics.com/web/en/tools.htmland their cnc controller has also the capability to load a height scan map and compensate the Z axis.
Sometimes I do some pcb engraved and I have few friends which are engraving workpieces with irregular surface .
Such option would be very useful. Anyone has any ideea if this exist or how could be done ?
REgards,
Daniel