Importance

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Abstract

An electric arc saw and a method for operating the saw for cutting metallic objects by melting a narrow kerf into the object are disclosed. The method provides for determining the minimum cutting current. The blade is advanced through the object at a speed which is continuously monitored and varied as required to maintain the current flow between the blade and the object substantially constant. The blade is mounted to a vertically disposed, hollow piston that reciprocates in a cylinder mounted to and movable along a cross-head. The piston can be pivoted abouts its axis to align the blade with the different cutting directions. When the object is so large that the threshold cutting current exceeds the available power supply, or when the power supply exceeds the threshold by a small amount only, the blade is operated to cut through the object in multiple passes, each at a depth which is less than the thickness of the object and chosen to provide a high cutting speed.

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First Claim