for double side layer (here is two types drills) pth=plated and npth=non plated
for pth drill the formula is
fin dia=drill dia -0.15
for npth drill the formula is
fin dia=drill dia -0.05
for single side layer (only one type drill here)
fin dia =drill dia-0.05
and i attached the txt file for reference purpose.
i also need a script for this.