hello this is my first time using this site n i am looking for help. i am using a milltronics rw15 machine. i am currently working on copper that is roughly .5 inch thick. drilling and tapping many holes at 0-80 and 2-56. i am breaking taps repeatedly and not sure what i am doing wrong. i have drilled the holes .040 past the tap depth and have tried pecking and cant get anything to work.