Thanks for your reply joma,
actually i already created the oval slot and drill legend but when i create the nc-route file i cant open it in CAM350, it returns an error like "there is no header". i can export the data with ODB++ but i need to convert it into .art file or get rid of this error in nc-route. I think there is a problem with my nc-route file. I cant find out what it could be.