Rotationally symmetrical lead machine-tool turned projectile for gas-guns

Abstract

A rotationally symmetrical lead metal-cut projectile of the caliber ranging from 0.17 to 0.50 for gas-guns comprises at least 60% by weight of lead, up to 40% by weight of tin and up to 5% by weight of admixtures selected from the following list: Ag, As, Bi, Cd, Cu, Fe, Ni, Sb, Zn, Ti or their mixtures thereof.

1 . A rotationally symmetrical lead metal-cut projectile for gas-guns comprising at least 60% by weight of lead, up to 40% by weight of tin and up to 5% by weight of admixtures selected from a group consisting of Ag, As, Bi, Cd, Cu, Fe, Ni, Sb, Zn, Ti and mixtures thereof, and wherein the projectile caliber is ranging from 0.17 to 0.50. 
     
     
         2 . The rotationally symmetrical lead metal-cut projectile according to  claim 1 , wherein the projectile comprises at least 95% by weight of lead. 
     
     
         3 . The rotationally symmetrical lead metal-cut projectile according to  claim 1 , wherein the projectile is equipped with at least one groove perpendicular to a central axis of the projectile. 
     
     
         4 . The rotationally symmetrical lead metal-cut projectile according to  claim 1 , wherein the projectile is equipped with a flat back. 
     
     
         5 . The rotationally symmetrical lead metal-cut projectile according to  claim 4 , wherein a diameter of the flat back is smaller than a diameter of a center of the projectile. 
     
     
         6 . The rotationally symmetrical lead metal-cut projectile according to  claim 1 , wherein the projectile's shape is evenly narrowing from a centre of the projectile towards its front. 
     
     
         7 . The rotationally symmetrical lead metal-cut projectile according to  claim 1 , wherein a length of the projectile is greater than a diameter of the projectile. 
     
     
         8 . A method of manufacture of a rotationally symmetrical lead metal-cut projectile comprising at least 60% by weight of lead, up to 40% by weight of tin and up to 5% by weight of admixtures selected from a group consisting of Ag, As, Bi, Cd, Cu, Fe, Ni, Sb, Zn, Ti and mixtures thereof, wherein the projectile caliber is ranging from 0.17 to 0.50, the method comprising:
 clamping a bar made of lead alloy comprising at least 60% by weight of lead into a collet on a mandrel of a machine-tool;   clamping a cutter and a cut-off tool on a cutter support of the machine-tool;   programming in the machine-tool a metal-cutting curve;   starting the machine-tool is starting;   machining the bar made of lead alloy by the cutter as per the metal-cutting curve; and   separating a machined projectile in a point of the flat back by the cut-off tool.   
     
     
         9 . The method of manufacture of the rotationally symmetrical lead metal-cut projectile according to  claim 8 , wherein the cutter or the cut-off tool is equipped with a blade made of carbide or a blade made of high-speed steel of CSN class 19. 
     
     
         10 . The method of manufacture of the rotationally symmetrical lead metal-cut projectile according to  claim 8 , wherein the bar is rotating around its central axis and the cutter is moving in one plane, wherein the central axis is a part of this plane. 
     
     
         11 . The method of manufacture of the rotationally symmetrical lead metal-cut projectile according to  claim 8 , wherein the cut-off tool blade thickness ranges between 0.4 and 1.5 mm.