(under subclass 260) Apparatus consisting of means for cutting a spiral groove in the inner surface of the barrel of a small arms or ordnance device.
(1) Note. The tool of this subclass normally turns gradually about the axis of the work (usually through less than 360); however, it is considered to be a broaching tool rather than a milling tool because it is driven axially rather than rotatable.
SEE OR SEARCH THIS CLASS, SUBCLASS:
64+, for milling by a rotating tool wherein the tool is driven to rotate.
306, for rifling a gun barrel by a planing tool.
SEE OR SEARCH CLASS
29, Metal Working, 1.1+, for apparatus especially adapted for making a projectile throwing implement of metal, whether small arms or a large gun.
408, Cutting by Use of Rotating Axially Moving Tool, for cutting by a rotatably driven cutting tool that moves axially through or about a workpiece with no other movement with respect to the workpiece, as in the case of cutting screw threads on a bolt.
