The cooling ducts have different angles to the blade surface. The outlet area is shaped like a funnel. The most important geometrical characteristics are the diameter, roundness, angle and depth of the cooling ducts as well as the residual wall thickness from the end of the cooling duct to the opposite blade surface. With tolerances of 50 µm to 200 µm, the requirements for measurement uncertainty are rather low. The measurement time plays a subordinate role.
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