Electric drill and combinators. (Factorio)

shooterrus
All combinators work on the already FINISHED product ( produced resource, manufactured parts ...) . But to get the drill to get just the right resource ( and does not produce unnecessary), he can. Use of filter manipulators, need the resources use for the purpose, unnecessary taps to the side. ( Although unnecessary resources in this game ... I even demolished forests are for fuel and burned in the ovens :-) )
And the drill will produce different resources for the time unit to sustain it is the percentage of exploited resources, which was at the time of its installation ( the exception is the case when the drill is set on the edge of resources and scope a lot of empty cells, then the percentage , sometimes much strays...)