Using a $\frac{1}{2}"$ mill for diameter cutter

What would be the radius cutter?

Add$/$subtract the radius cutter to the dimensions.

$\%$

N$5$G$0$G$17$G$20$G$40$G$80$

N$10$G$0$G$91$G$28$Z$0$

N$15$T$1$M$\_$F$20$

N$16$G$90$G$\_$X$-\mathrm{.}25$Y$-\mathrm{.}8$S$4000$M$3$

N$18$G$\_$H$\_$Z$\mathrm{.}1$M$8$

N$20$G$1$Z$\_$

N$25$Y$0$

N$30$G$91$Y$\_$P$1-$P$2$

N$35$X$\_$P$2-$P$3$

N$40$Y$\_$P$3-$P$4$

N$45$X$\_$P$4-$P$5$

N$50$Y$\_$P$5-$P$6$

N$55$G$90$

N$60$X$\_$P$6-$P$7$

N$65$Y$\_$P$7-$P$8$

N$70$X$\_$ P$8-$P$9$

N$75$Y$\_$P$9-$P$10$

N$80$X$\_$P$10-$P$1$

N$85$Z

N$87$G$0$G$91$G$\_$Z$0.$YO$.$M$\_$

N$90$M$\_$

N$95$M$\_$

$\%$

$11\mathrm{.}0200$

P$221\mathrm{.}0/4$s$34\mathrm{.}0$Pyp$325\mathrm{.}0.$P$8$Ps$30\mathrm{.}028\mathrm{.}0$