Detachable Cutters for RockBoring Drills.
To various classes of tools the idea of detachable cutters is now being applied with considerable advantage. In adapting the idea of rock-boring drills, however, numerous obstacles are encountered owing to the severe stress much work entails. To screws, catches, and other devices used for fixing and holding detachable cutters in other kinds of tools, the shock sustained by a rock-drill from the heavy blows of a miner's hammer is fatal. That a rock-drill should be practically a solid tool is absolutely essential. In the " Mowbray " detachable cutters and holders for hand and machine
drilling, introduced by J. Nicholson and Sons, of the Mowbray Steel Works, Sheffield, these difficulties have apparently been overcome. For holding the cutters an ingenious and carefully-thought-out device is employed. The cutters have three cutting edges, representing practically three tools, and, armed with a dozen of these m bis pockets, the miner has no need to waste time in having his tools sharpened — often a lengthy operation. The importance of having detachable cutters will be understood when it is known that some machines in the deep levels of gold and other mines need a hundred drills of different sizes to keep them going, and then often have to wait for sizes specially required. Not a minute is occupied in changing the detachable cutter.
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https://paperspast.natlib.govt.nz/periodicals/P19060102.2.15.2
Bibliographic details
Progress, Volume I, Issue 3, 2 January 1906, Page 51
Word Count
222Detachable Cutters for Rock-Boring Drills. Progress, Volume I, Issue 3, 2 January 1906, Page 51
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