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Thursday, 2 July 2015

Difference between Positive and Negative Rake Angles

Difference between Positive and Negative Rake Angles Points : difference between positive and negative rake angles, positive rake angles vs negative rake angles, comparison between positive and negative rake angles, difference between the rake angle and cutting angle
Difference between Positive and Negative Rake Angles
Positive Rake Angles
Negative Rake Angles
1.A positive rake angle is a top rake angle of less than 90°A negative rake angle is a top rake angle of 90° or larger.
2.A positive rake angle to cut hard materials such as cast iron.A negative rake angle to remove large amounts of material.
3.Positive rake angle, the leading edge of the cutting tool is behind the perpendicular of the material to be cut.Negative rake angle while the tool leading edge is ahead or beyond the perpendicular of the material to be cut.
4.A positive rake angle tends to pull the work towards the blade this is desireable in a table saw as that also pulls the work down onto the surface of the table.A negative rake angle on the other hand tends to push the work away from the blade which is desireable in a radial arm saw because it pushes the work towards where it is being supported.
5.The positive rake angle cause the face of the cutting tool to slant downward when moving away from the cutting edges.The negative rake angle cause this surface to slant upward when moving away from the cutting edge.
6.Positive rake angle are less cutting force.Negative rake angle are more cutting force.
7.Positive rake angle should be used whenever possible for all types of high-speed steel milling cutters.Negative rake angle are frequently employed to provide more material back of the cutting edge to resist shock loads.

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