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- Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work. There are three types of rake angles: positive, zero or neutral, and negative.
* Positive rake: A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side.
* Zero rake: A tool has a zero (or neutral) rake when the face of the cutting tool is perpendicular to the cutting edge at inner side.
* Negative rake: A tool has a negative rake angle when the face of the cutting tool slopes away from the cutting edge at outer side. Positive rake angles generally:
* Make the tool more sharp and pointed. This reduces the strength of the tool, as the small included angle in the tip may cause it to chip away.
* Reduce cutting forces and power requirements.
* Helps in the formation of continuous chips in ductile materials.
* Can help avoid the formation of a built-up edge. Negative rake angles generally:
* Increasing the strength of the cutting edge. The tool is more blunt.
* Increases the cutting force.
* Increases the power required for a cut.
* Can increase friction, resulting in higher temperatures.
* Can improve surface finish. Zero rake angles:
* Easier to manufacture.
* Easier to resharpen.
* Less power and cutting forces than a negative raked tool.
* Chip will wear and 'crater' the rake face. (en)
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- Rake angle is a parameter used in various cutting and machining processes, describing the angle of the cutting face relative to the work. There are three types of rake angles: positive, zero or neutral, and negative. Positive rake angles generally:
* Make the tool more sharp and pointed. This reduces the strength of the tool, as the small included angle in the tip may cause it to chip away.
* Reduce cutting forces and power requirements.
* Helps in the formation of continuous chips in ductile materials.
* Can help avoid the formation of a built-up edge. Negative rake angles generally: (en)
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