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Surface Finish Notation

Can somebody elaborate on this image? If I am not mistaken, they want a 2.5 microinch surface finish, direction doesn't matter, and they want the finish using a .030 cutoff.

Is this a length cutoff or is this a filter cutoff? I am seeing some oscillation in my roughness waveform. The part is a ball, as the probe falls off the center of the ball, the oscillations become more severe. If I change Ra filter cutoff to .003, the waveform looks like a traditional roughness waveform and the part passes.

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