Abstract
The problem of defining the rake angle which controls the cutting process in oblique machining is considered. Experimental results are presented from which it is concluded that the rake angle normal to the cutting edge is of greatest significance. The direction of chip flow is examined and from measured forces, allowing for rubbing and ploughing at the cutting edge, it is shown that the direction of chip flow is not directly proportional to the obliquity as has been suggested by Stabler, but that this relationship is more complex and depends on the normal rake angle. Finally it is shown that for a given normal rake angle, the shear angle normal to the cutting edge is independent of the angle of obliquity.
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