Helix Angle The helix angle is the angle between the cutting edge and the axis of the tool. It influences the cutting forces, chip evacuation, and tool deflection.
Low helix angles (30°-35°) These angles generate less axial force on the spindle and work holding, resulting in reduced tool deflection. However, they produce a more aggressive cutting action, which can lead to chatter and poor surface finishes, especially in long-reach applications. High helix angles (40°-50°): These angles generate greater axial force on the spindle and work holding, which can lead to increased tool deflection. However, they provide better chip evacuation and smoother cutting action, resulting in improved surface finishes and reduced chatter, especially in materials like aluminum and non-ferrous alloys.
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