A rake angle is the angle between the leading edge of a cutting tool and a perpendicular to the surface being cut.
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Negative Rake is by definition the angle between the leading edge of a cutting
tool and a perpendicular to the surface being cut when the blade is AHEAD of the cutting edge.
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Plowing Action with a Negative Rake Cutting Tool
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The "K" file is an example of a Negative Rake Instrument and it will cut going IN and OUT of a canal.
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Positive Rake is by definition the angle between the leading edge of a cutting
tool and a perpendicular to the surface being cut when the blade is BEHIND the cutting edge.
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Cutting a Chip with a Positive Rake Cutting Tool
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A Hedstrom Type File is an example of a Positive Rake Instrument and it cuts only on the way OUT of
a canal.
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