Abstract: A cutting insert has an insert body with at least one pair of cutting regions. Each cutting region is comprised of a cutting edge and the cutting edges in a pair are diametrically opposed to one another about a pair axis. Each cutting edge of a pair faces a single rotary direction along a pair circle, and for each pair of cutting regions the cutting edges have cutting profiles that are not identical to one another. In a toolholder assembly utilizing this arrangement, the cutting edges of a pair protrude beyond the perimeter of the toolholder.

Abstract: A cutting insert has an insert body with at least one pair of cutting regions. Each cutting region is comprised of a cutting edge and the cutting edges in a pair are diametrically opposed to one another about a pair axis. Each cutting edge of a pair faces a single rotary direction along a pair circle, and for each pair of cutting regions the cutting edges have cutting profiles that are not identical to one another. In a toolholder assembly utilizing this arrangement, the cutting edges of a pair protrude beyond the perimeter of the toolholder.

Abstract: A toolholder assembly for holding a cutting insert has a removable blade for mounting the cutting insert and a toolholder body for mounting the removable blade. The removable blade fits within a pocket in the toolholder body having angled sides to positively capture the blade.

Abstract: A process for the conversion of an aromatic-rich, distillable gas oil charge stock which is essentially free from asphaltenic hydrocarbons and possesses an aromatic hydrocarbon concentration greater than about 20 volume percent to selectively produce large quantities of high quality middle distillate while minimizing hydrogen consumption which process comprises the steps of: (a) reacting the charge stock with hydrogen, in a catalytic hydrocracking reaction zone, at hydrocracking conditions including a maximum catalyst bed temperature in the range of about 600.degree. F. (315.degree. C.) to about 850.degree. F. (454.degree. C.

Abstract: A process for the conversion of an aromatic-rich, distillable gas oil charge stock to selectively produce large quantities of high quality middle distillate while minimizing hydrogen consumption which process comprises the steps of reacting the charge stock with hydrogen, in a catalytic hydrocracking reaction zone, at hydrocracking conditions including a maximum catalyst bed temperature in the range of about 600.degree. F. (315.degree. C.) to about 850.degree. F. (454.degree. C.