hi we have a kia skt 21lms lathe with c axis , need help how to
program 1/2-4 2 star thread . i understand 1 thread start at
o degreen and the 2nd star at 180.

The thread lead is .25, so start your first thread at Z.25 and the 2nd thread at Z.125, I would make thread depth per cut shallow because that is gonna be going very fast.