▁dr ill ▁and ▁routing ▁formats . ▁▁ ▁X NC ▁is ▁a ▁strict ▁subset ▁of ▁IP C - NC - 3 4 9 , ▁Ex cell on ▁a ▁big ▁su pers et . ▁Many ▁in defin ite ▁NC ▁files ▁pick ▁some ▁elements ▁of ▁the ▁IP C ▁standard . ▁ ▁A ▁digital ▁rights ▁managed ▁copy ▁of ▁the ▁specification ▁is ▁available ▁from ▁the ▁IP C ▁website , ▁for ▁a ▁fee . ▁It ▁is ▁target ed ▁at ▁input ▁for ▁dr ill / rout ▁machines , ▁not ▁C AD ▁to ▁C AM ▁data ▁exchange . ▁ ▁X NC ▁format ▁ ▁The ▁X NC ▁format ▁is ▁strict ▁subset ▁of ▁the ▁IP C - NC - 3 4 9 ▁specification ▁target ed ▁at ▁data ▁exchange ▁between ▁C AD ▁and ▁C AM . ▁The ▁name ▁X NC ▁format ▁stands ▁for ▁Exchange ▁NC ▁format . ▁As ▁a ▁strict ▁subset , ▁it ▁is ▁highly ▁compatible ▁with ▁existing ▁software . ▁ ▁Its ▁purpose ▁is ▁to ▁address ▁the ▁current ▁cha os ▁of ▁different ▁subsets ▁and ▁incomplete ▁NC ▁files , ▁and ▁define ▁a ▁simple ▁common ▁standard . ▁The ▁X NC ▁subset ▁was ▁defined ▁by ▁a ▁cons ort ium ▁formed ▁by ▁Graph icode , ▁U cam co , ▁Ki C ad ▁and ▁P ental og ix . ▁▁ ▁The ▁specification ▁is ▁freely ▁available ▁among ▁others ▁at ▁the ▁U cam co ▁download ▁page . ▁The ▁specification ▁is ▁brief , ▁detailed , ▁easy ▁to ▁understand ▁and ▁un ambigu ous . ▁It ▁is ▁target ed ▁at ▁ ▁C AD ▁to ▁C AM ▁data ▁exchange , ▁not ▁at ▁input ▁for ▁dr