Device and method for controlling the machining depth of a machine for machining multilayer printed circuit boards

摘要: The device includes an operating head movable by a control unit with respect to board for machining; the holder and electric motor tool spindle; rotor of rotates stator on air-cushion supports, slides axially further support is insulated head; signal generator senses capacitance between stator, generates upon spindle contacting upper surface board; used define reference dimension relative surface, so condition as feed predetermined depth surface.