ball burnishing process on herringbone gear (newbie)

[magicniner]

I recon that the corners will suffer rounding, but as Nick says "ask the supplier"

Inside corners only.

But if you relieved the outside corners to a slightly larger radius there is no reason the gear wouldn't function perfectly, the "Point" and "Valley Bottom" on the gear where the two opposite angled tooth profiles join can be relieved significantly for clearance without affecting the function of the gear.

If you made a finishing pass for the inside corner with an engraving cutter you could actually get quite a sharp inside corner, you'd have to have good 4-axis CAM for that, and know how to use it too.