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Processing Of Stones Or Stones Resemblance Materials
(AREA)
Abstract
A double-acting drill, characterized essentially by being constituted by a main shaft at one end of which there is a cutting head formed by a flattened expansion, pointed end and sharpened as a blade, said shaft being sheathed to its central part by a tubular piece with a larger diameter than the aforementioned expansion, fixed to the same axis by a coaxial captive screw, and provided with a double spiral bevelled lower, which gives rise to two live cutting edges, and two perimeter signaling regattas they indicate the top of the stroke of the drill itself depending on whether one or two plates are desired respectively. (Machine-translation by Google Translate, not legally binding)