Face grooving Geometry explanation?

[Ketherton21]

ive seen this issue replicated every time I do face grooving and have yet to figure out the science behind it.

basically, I have a .078 face grooving tool, I select my geo to groove and it seems no matter what type of setup I use the code outputs incorrect, basically resolving in the grooves being completely wrong (the code is offset 2x the width of the tool positive in X). see attached file (setup 2, the singled out path named "this tool path")

my solution so far has been to just offsetting my tools geometry in the machine. also attached are pictures explaining it.

[Ketherton21]

ok so I think part of the confusion is due to there being "no holder" because it always shows collisions. also the flipped around backwards viewing of the tools and tangent. I solved the issue by leaving my setup exactly how it was and touching off on the opposite side of the probe (same way as a boring bar)