Method and apparatus for carrying out deep holes and/or bottle-boring

A method for carrying out deep holes and/or bottle-boring, in particular borings, with a high ratio between final linear depth and hole diameter, higher than 14:1, comprises the steps of: carrying out a reference hole, having axis and diameter linked to the deep hole to be carried out by a predetermined spatial relationship; making a deep hole of a diameter smaller than the hole to be carried out, so that said reference hole and said first deep hole be in spatial communication; and prearranging a guiding and supporting element internal to said reference hole and connecting thereto a tool shaft and a related tool to obtain a contour internal to the deep hole and/or a deep hole of diameter and axis according to said predetermined spatial relationship.