Method for using a cutting tool having variable movement at two simultaneously independent speeds in an x-direction into a work piece for making microstructures

A method for using a dual in-line actuator to machine a work piece, comprising:

• providing a work piece having a surface to be machined;
• providing a dual in-line actuator, the actuator comprising:
• a main body having an aperture with an opening in the main body;
• a paddle having a first side and a second side opposite the first side;
• a tool tip carrier having a surface for mounting a tool tip;
• a tool tip mounted on the surface of the tool tip carrier;
• a first piezoelectric stack attached to first side of the paddle;
• and
• a second piezoelectric stack having a first end attached to the second side of the paddle and having a second end, opposite the first end, attached to the tool tip carrier,
• wherein the first and second piezoelectric stacks, attached via the paddle, are secured and preloaded in the aperture of the main body, and
• wherein the first piezoelectric stack moves the tool tip carrier in an x-direction substantially perpendicular to the surface of the work piece to be machined and the second piezoelectric stack moves the tool tip carrier in the x-direction substantially perpendicular to the surface of the work piece independent from the movement of the first piezoelectric stack;
• and
• using the actuator to create structures in the surface of the work piece to be machined, wherein the structures are created by the tool tip as controlled by the actuator.