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"I'm clear now that the tilted ("off normal") strategy is really only for 5-axis machines that can calculate and then deliver a consistent angle and appropriate direction of cut to really deliver the...

Chris, in that sample you show there the bit would almost never be "normal" to the face of the part, so even on a 3 axis machine you'd still, for lack of a better word get that "tilt" that you want....

I think it might be worth going back to your original assumption for a minute:

"I'm convinced ball end cutters don't really cut at the very end of the tip"

By that logic V carve bits would...

The hardware would be reasonably easy to do, the software side would be more difficult. You wouldn't be able to toolpath this in any Vectric products because they don't do multi axis. Fusion 360...