Trigonometry help please, plunge depth for a v cutter!

[Ulsterman]

Touch the tool off at the required Dia that you can measure on the part ---- and program machine to cut to the Face -no trig needed but approach move should include room for the tip -very common practice on combo tools

[cncJim]

Touch the tool off at the required Dia that you can measure on the part ---- and program machine to cut to the Face -no trig needed but approach move should include room for the tip -very common practice on combo tools

Thanks for the advice Ulsterman, but in this case I really am after the trig as I am coding an application to produce g-code.