With the current straight line facing operation, the last pass usually pushes a burr over the edge of the part with materials like aluminum. An outside-in spiral path eliminates this because the cutting edge is always moving towards the work piece instead of away from it. Ideally this would also be combined with the chip thinning option to produce a constant engagement angle path that reduces stress on insert type cutters commonly used for facing.
The spiral path type is also likely to be more time efficient because it maintains consistent contact with the part instead of going off the edge on every pass.
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