Method for trepanning tapered metal shapes

Claim 1

THE METHOD OF MAKING A PLURALITY OF FRUSTO-CONICAL SHELLS FROM A SINGLE METALLIC BILLET AND COMPRISING CUTTING AND REMOVING THE METAL OF THE BILLET BY CONTINUOUSLY PROGRESSIVELY CUTTING AND REMOVING THE METAL CIRCUMFERENTIALLY OF THE BILLET AXIS WHILE CONCURRENTLY PROGRESSIVELY ADVANCING THE CUT ENDWISE OF THE BILLET BIAS TO SAID AXIS TO FORM IN THE BILLET SUCCESSIVE FRUSTO-CONICAL KERFS, OF UNIFORM WIDTH NARROW THROUGHOUT SSUBSTANTIALLY THEIR ENTIRE AXIAL EXTENT, AND COAXIAL WITH THE BILLET AND PARALLEL TO EACH OTHER AND SLOPING INWARDLY AXIALLY OF THE BILLET FROM ONE END OF THE BILLET TOWARD ITS OTHER END, AND SPACED FROM EACH OTHER AXIALLY OF THE BILLET WITH THE MAJOR PORTION OF THE AXIAL LENGTH OF ADJACENT PERIPHERAL WALLS OF ADJACENT KERFS IN ALIGNED SPACED RELATION TO EACH OTHER RADIALLY OF THE BILLET AND WITH ALL OF THE WALLS OF ALL KERFS PARALLEL TO EACH OTHER SO AS TO FORM FRUSTO-CONICAL SHELLS OF THE BILLET METAL BETWEEN EACH TWO ADJACENT KERFS WITH THE MAJOR PORTION OF THE AXIAL LENGTH OF THE PERIPHERAL WALLS OF EACH SHELL, WHICH WERE FORMED BY CUTTING THE KERFS ADJACENT TO THAT SHELL, ALIGNED WITH EACH OTHER RADIALLY OF THE SHELL AXIS, AND SEVERING THE SHELLS FROM THE REMAINDER OF THE BILLET.

Claim 2

THE METHOD OF MAKING A PLURALITY OF FRUSTO-CONICAL SHELLS FROM A SINGLE METALLIC BILLET AND COMPRISING CUTTING AND REMOVING THE METAL OF THE BILLET BY CONTINUOUSLY PROGRESSIVELY CUTTING AND REMOVING THE METAL CIRCUMFERENTIALLY OF THE BILLET AXIS WHILE CONCURRENTLY PROGRESSIVELY ADVANCING THE CUT ENDWISE OF THE BILLET BIAS TO SAID AXIS TO FORM IN THE BILLET SUCCESSIVE FRUSTO-CONICAL KERFS, OF UNIFORM WIDTH NARROW THROUGHOUT SSUBSTANTIALLY THEIR ENTIRE AXIAL EXTENT, AND COAXIAL WITH THE BILLET AND PARALLEL TO EACH OTHER AND SLOPING INWARDLY AXIALLY OF THE BILLET FROM ONE END OF THE BILLET TOWARD ITS OTHER END, AND SPACED FROM EACH OTHER AXIALLY OF THE BILLET WITH THE MAJOR PORTION OF THE AXIAL LENGTH OF ADJACENT PERIPHERAL WALLS OF ADJACENT KERFS IN ALIGNED SPACED RELATION TO EACH OTHER RADIALLY OF THE BILLET AND WITH ALL OF THE WALLS OF ALL KERFS PARALLEL TO EACH OTHER SO AS TO FORM FRUSTO-CONICAL SHELLS OF THE BILLET METAL BETWEEN EACH TWO ADJACENT KERFS WITH THE MAJOR PORTION OF THE AXIAL LENGTH OF THE PERIPHERAL WALLS OF EACH SHELL, WHICH WERE FORMED BY CUTTING THE KERFS ADJACENT TO THAT SHELL, ALIGNED WITH EACH OTHER RADIALLY OF THE SHELL AXIS, AND SEVERING THE SHELLS FROM THE REMAINDER OF THE BILLET.