Tool mounting for a cutting tool

A tool for mounting in a tool mounting block of the type having a forward surface, a rear surface, and a transverse aperture extending from said forward surface to said rearward surface, said cylindrical aperture having a given diameter, said tool comprising,

• a tool body having a forward cutting end, an annular flange axially aligned behind said forward end, and a mounting portion axially aligned behind said annular flange,
• said annular flange having a diameter greater than said given diameter of said aperture,
• said tool body having a seat at a forward end of said cutting end, and having a principal longitudinal axis,
• a hardened metal insert bonded into said seat,
• said mounting portion having a threaded stud extending axially from a rear end thereof, said threads of said stud having a given rate of incline,
• a locking nut on said threaded stud for retaining said mounting portion in said aperture of said mounting block,
• said locking nut having a first threaded portion sized to receive threads of said threaded stud, and a second unthreaded portion,
• said first threaded portion having a first surface,
• said second unthreaded portion having a second surface and a third surface, said second surface for engagement with said first surface, and said third surface for engagement with said rearward surface of said mounting block,
• said first surface and said second surface having a spiral ramp,
• said spiral ramps of said first surface and said second surface having a rate of incline greater than said given rate of incline,
• said third surface having a diameter greater than said given diameter of said aperture.

A tool and mounting comprising in combination,

• a tool mounting block having a forward surface, a rearward surface, and a transverse cylindrical aperture extending from said forward surface to said rearward surface,
• a tool body having a forward cutting end, an annular flange axially aligned behind said forward end, and a cylindrical mounting portion axially aligned behind said annular flange,
• said annular flange having a rearward surface,
• said tool body having a seat at a forward end of said cutting end, and having a principal longitudinal axis,
• a hardened metal insert bonded into said seat,
• said cylindrical mounting portion having a threaded stud extending axially from a rear end thereof, said threads of said stud having a given rate of incline,
• said mounting portion of said tool positioned in said cylindrical aperture with said rearward surface of said annular flange in engagement with said forward surface,
• a nut on said threaded stud for retaining said cylindrical mounting portion in said mounting block,
• anti-rotation means on said rearward surface of said annular flange and said forward surface of said tool mounting block, whereby a portion of said annular flange extends over at least a portion of said anti-rotation means on said forward surface.