When accurate boring is required, CNC (Computer Numerically Controlled) borers are generally used as they allow for greater accuracy.
Below is Electro Motion's (Stock No. J27627) Schiess, 2 axis, CNC, double column vertical borer. It has a 3500mm table that has a table load of 30 tonnes and is fitted with the Seimens Sinumerik 840C control. Full machine details can be found here.
|SCHIESS 3500MM 2 AXIS CNC DOUBLE COLUMN VERTICAL BORER|