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Climb milling, also known as down milling, refers to the technique where the feed direction of the workpiece is aligned with the rotation of the cutter. In this method, as the cutter spins, the material moves in the same direction as the cutter's edge engages with it. This operation results in a more efficient cutting action, allowing for a cleaner surface finish and generating less heat compared to the conventional milling method. The cutting edges slice through the material instead of pushing it, resulting in lighter engagement, which helps prevent the tool from digging into the material.

This method is particularly advantageous for modern machining processes, as it tends to require less force and can lead to longer tool life when performed correctly. While climb milling can provide benefits, it also demands precise machine calibration and a firm gripping of the workpiece to prevent any unwanted movement or chatter during operation.