Pit & Quarry Handbook and Purchasing Guide for the Nonmetallic Minerals Industries
This not only increases the footage drilled per day, but it also reduces rock-drill repair costs, because the energy of the drill is exerted to cut rock, while ... The development of specialized reconditioning equipment has further increased the economy of detachable bits. ... The best results in drilling medium or hard rock with any type of pneumatic hammer drill are obtained by the use of carbide insert bits.
| Title | : | Pit & Quarry Handbook and Purchasing Guide for the Nonmetallic Minerals Industries |
| Author | : | |
| Publisher | : | - 1961 |
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