Thermal Drilling - Friction Drills
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DOUBLE-ENDED FRICTION DRILLS WITH LARGE SHANK
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FRICTION DRILLS - SHAPED W/POINT AND RADIUS FOR CHIPLESS DRILLING OF THIN-WALLED MATERIALS
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EXPANDER DRILLS - TAPERED FOR DRILLING W/PREHOLE,DOUBLE ENDED
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Friction created between the rotating tool and the workpiece generates heat, causing the material to "flow"
WITH COLLAR & REDUCED SHANK CONFIGURATION
EXAMPLE OF THERMAL DRILLING OF NATURAL GAS PIPE FOLLOWED BY FORM TAPPING - CHIPLESS