Adjustable boring bar cartridge

A boring bar assembly comprising a generally cylindrical body rotatable about a centrally disposed axis,

• said body comprising a peripheral surface area and at least one recess,
• an adjustable cartridge for receipt in said recess,
• said recess having an axial length dimension and spaced walls parallel with respect to each other and said axis,
• said walls extending for said axial length dimension,
• said recess further including an arcuate seating surface which intersects said walls and opens radially to said periphery,
• said cartridge comprising an anvil having a generally planar top face and a radiused bottom surface,
• said top face further comprising axially spaced forward and rear portions separated by a pocket for receipt of a polygonal form lay down indexable insert,
• means for preloading said anvil in said recess,
• means for adjusting said cartridge in said boring bar,
• said radiused surface extending from said rearward to forward portion,
• said rearward portion having a first recessed area for receipt of said adjustment means,
• said adjustment means comprising a screw threaded in said boring bar and abutting said rearward portion to drive said anvil along said arcuate surface in a counterclockwise direction thereby effecting radial adjustment of said insert,
• said forward portion having a second recessed area for receipt of said preloading means,
• said preloading means comprising a screw which traverses said anvil and threads into said boring bar, and spring washers which are trapped in said second recess by said screw,
• said anvil having a center point about which said anvil rotates,
• said insert having a cutting edge seated in said anvil with said edge spaced axially from said center point so to impart rotational force about said center point and loading on said adjustment screw rather than on said preloading screw, and
• means for forcing said anvil toward at least one of said recess walls.