Even punching and cutting operations (except when trimming waste) by smiths will usually re-arrange metal around the hole, rather than drilling it out as swarf.
The heat produced during the cutting process is therefore not evacuated with the swarf, but the major part of the heat is concentrated inside the tool or the cutting edge.
If the swarf is not removed as fast as it is produced, the flutes will clog and prevent the tool cutting efficiently, causing vibration, tool wear and overheating.
Several factors affect swarf removal, including the depth and angle of the flutes, the size and shape of the chips, the flow of coolant, and the surrounding material.
