Positive And Negative Rake Angle. Helps reduce cutting force and thus cutting power. There are two rake angles, namely the back rake angle and side rake angle, both of which help to guide chip flow. Negative rake inserts angled according to the first picture.
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This is a potentially dangerous situation. This reduces the strength of the tool, as the small included angle in the tip may cause it to chip away. Rake angle for tool depend on following factor.
This implies that given a negative angle, we can get its respective positive angle.
Both positive and negative rake angles indicate angular distance of cutting tool's rake surface from reference plane; For instance, the bottom part of the vertical line is 270°. Positive rake angle generally used in the cutting of soft material. … these blades may be positioned at different angles in order to change the property of the bur. Helps reduce cutting force and thus cutting power. This combination, when paired with a high lead. A tool has a positive rake when the face of the cutting tool slopes away from the cutting edge at inner side. A positive rake angle is a top rake angle of less.
