A study of methods to improve the performance of drag bits used to cut hard rock

Hood, Michael2015-08-062015-08-062015-08-06http://hdl.handle.net/10539/18193A Thesis Submitted to the Faculty of Engineering University of Witwatersrand, Johannesburg for the Degree of Doctor of Philosophy. Johannesburg 1977No abstractenDrag bits (Drilling and boring)A study of methods to improve the performance of drag bits used to cut hard rockThesis