hello Greg
Many thanks for your answer, and yes I'm new,
the formula is written on the ISO pdf like this
x' = Dm/2 x cos ζ - 2 x e x cos(2ζ) + e x cos(4ζ)
y' = Dm/2 x sin ζ + 2 x e x sin(2ζ) + e x sin(4ζ)
Dm and e depends of the size of the toolholder, as example DM= 35 mm, e= 1.12 mm, it give...