A crankshaft milling cutter has a disc-shaped main body rotatable about an axis perpendicular to the disc plane and on the periphery recesses for receiving indexable cutting inserts for removing an allowance on the crankshaft blank. At least some of the recesses are open both in the radial direction and in at least one axial direction of the main body and a first group of said recesses receives cutting inserts designed for removing the allowance on an oil collar adjoining a shaft journal. To provide a crankshaft milling cutter able to meet the increasing requirements with regard to dimensional and positional tolerances placed on a crankshaft milling cutter and at the same time reduces the time needed for fine adjustment of the crankshaft milling cutter, only some of the first group of recesses has devices for setting the axial position of the indexable cutting insert received in each case therein.

Cutting insert with a cuboid body has a substantially square top face and bottom face, said top face and bottom face connected by four peripheral adjoining side surfaces. At least two cutting edges are formed at the transition of the top face to at least two side surfaces, that cutting edges defining a plane of the top face. To provide a cutting insert and a corresponding tool suited to produce valve seat surfaces with high precision but still having a rather simple construction and being precisely mountable with ease and less efforts of adjustment, the plane defined by the top face cutting edges of the cutting insert has maximum dimensions of 7 mm7 mm, where the bottom face has a supporting surface formed exactly parallel to the plane defined by the top face cutting edges by means of grinding within a tolerance of less than 5 angular minutes.

A method of mounting at least one pressure port in a skin of an aircraft, where the port is made with a hollow tube implanted in the skin, optimizes conditions whereby each of the tubes is made flush with the skin so that static or dynamic pressure measurements are accurate and reliable. The method includes a step of leveling each of the tubes and a step of painting the skin. To achieve satisfactory leveling conditions for the tubes on each occasion, the leveling step is independent of the layer of paint deposited on the skin.