E/MJ : engineering and mining journal . !wave transmission to drillii trin thai produces reciprocal motion directly and in whichthe blows can be tin reased up to anylimit desired has greal possi drilling rock used in cither a hamm on-drill machine. The Haddon drill (Fig. 2) is a piston machine andis in outward appearance similar to an air-operated drillexcept that there is no valve and no valve chamber isapparent. It consists of a piston mounted between aand a front bearing and floati o a strong spring on the fronl and a weaker oi n the hack. rear of the piston is i ui Eor the rat be! and ente
E/MJ : engineering and mining journal . !wave transmission to drillii trin thai produces reciprocal motion directly and in whichthe blows can be tin reased up to anylimit desired has greal possi drilling rock used in cither a hamm on-drill machine. The Haddon drill (Fig. 2) is a piston machine andis in outward appearance similar to an air-operated drillexcept that there is no valve and no valve chamber isapparent. It consists of a piston mounted between aand a front bearing and floati o a strong spring on the fronl and a weaker oi n the hack. rear of the piston is i ui Eor the rat be! and enters a rearchamber containing paw] and ratchet forgiving chamber is full of wafc d with the power line by a hose. The wa e if compi ssion sweeps, into thischamber and forces out the tinst the spring, sonnli I can hollow steel, andidly i the int lie drill must alloy. blow - about 180 lb. I minute and show< Hit. Piston Di II wi long held tl writings that the ideal drill the hammer drill, bul that di ill could b :. blovi -. Cool Water ? front Bearing. „- j ^Channel , pg£: to Bit FIG. 2 THE HADDON ROCK DRILL, WHICH IS OPERATED BY WAVE TRANSM which brings it hack on the return stroke, which i-erned by the rear spring. The drill has few moving parts. The introductisprings has been criticized but it would be easy to arrangethe return stroke by wave motion. Tests, howthat satisfactory springs having a long life can bcured, and they are easily changed if necessary. The1. ngtb of stro cock, but apart from the momentum itool being decreased by the shorter strok Iof the blow remains the same. This allowsrapidly collared on a very short >troke. A positive mechanical revolution is being introducedinto later designs of the drill, brought about by aniary piston panel actii ; piston. This will be an imnortant point in any haidrill model. The following questions natural!;the practical mining engineer: Vof such a drill be weak, causreacted that trials show that fitchering ra
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
