State-of-the-art of Down-the-hole-tools.
For Reference Only At Bureau Libraries :11 pages
This report provides the state-of-the-art of down-the-hole percussive drilling devices and recommendations as follows for research and development: 1. Rather than spend monies on research and development of new equipment, pursue actual drilling programs designed to test the latest equipment and techniques. 2. Allow actual testing programs in themselves to develop new methods and techniques as they progress toward the ultimate program goals. 3. Bring all factors on drilling techniques together in a test program to develop the proper balance, sequence, and procedure to accomplish the desired results.
CP; Final Contract Report;
For Reference Only At Bureau Libraries