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A Comparative Study Of Some Rock Drill Bits, Charles Roger Knopp
A Comparative Study Of Some Rock Drill Bits, Charles Roger Knopp
Masters Theses
"The detachable single-use rick-drill bit has attracted considerable attention in the mining industry of the United States during the past few years. While this type of bit has been used for some time in other countries, it has been only recently that these bits have been manufactured in the United States. It was decided to test this type of bit and make a comparative study of a single-use bit and a widely used detachable rock-drill bit"--Introduction, page 1.
A Comparative Study Of Some Rock Drill Bits, Paul Louis Terrasson
A Comparative Study Of Some Rock Drill Bits, Paul Louis Terrasson
Masters Theses
"This paper describes a comparative study which was made of the wear and efficiency of different types of rock-drill bits when used under various drilling conditions...The four types of experiments which were carried out had the following purposes: 1. Determine the influence of the size of the bit. 2. Determine the influence of the design of the bit. 3. Determine the influence of the type of hammer. 4. Compare the performances of steel and tungsten carbide bits in limestone and in granite"--Introduction, page 1.
On The Breakage Of Rock Drill Steel, Muir Luken Frey
On The Breakage Of Rock Drill Steel, Muir Luken Frey
Masters Theses
"Prior to 1920 there was little attention paid to the general problem of breakage of rock drill steel. Each locality had its problem and the matter was treated as a purely local one, independent upon conditions in that particular section. But in the above-mentioned year, there arose an interest of wider scope, from what causes it is impossible to determine accurately, and the matter is now the subject of a broad investigation in which the users of rock drill steel, the United States Bureau of Mines, and the United States Bureau of Standards are cooperating...There is, to date, no satisfactory …
Tests Of Rock Drill Bits For Water-Leyner Machine, Riley Marsh Simrall, Edmond Otis Stoliker
Tests Of Rock Drill Bits For Water-Leyner Machine, Riley Marsh Simrall, Edmond Otis Stoliker
Bachelors Theses
"The above investigation was made in the Mining Laboratory of the Missouri School of Mines, under the direction of Prof. C. R. Forbes, with the following object in view: To make comparative tests of various types of regular and special bits for the Water-Leyner machine as to drilling speed and total distance drilled by each bit without resharpening"--Introduction, page 2.