Adjustable lead angle chamfering toolholder

An adjustable lead angle endmill having a rotatable shank, comprising:

• an endmill body connected to an end of the shank and having a substantially radially-oriented wall;
• a cutting insert having a body with a linear cutting edge;
• a mounting assembly for pivotally mounting the insert onto the wall of the endmill body such that a lead angle of the linear cutting edge is angularly adjustable with respect to an outer periphery of the endmill body wherein the mounting assembly includes a discrete insert holder within the toolholder body, the insert holder has a pocket on one side for receiving the body of the insert, and wherein the mounting assembly further includes a fastener that is received within a bore in the wall of the toolholder body to pivotally connect the insert and insert holder to the wall of the body, and
• a locking screw for securing the insert in a selected pivoted position with respect to the wall of the toolholder body.

An adjustable lead angle toolholder, comprising:

• a toolholder body having a distal end that includes a planar wall;
• a cutting insert having a body with a linear cutting edge;
• means for pivotally mounting the insert onto the wall of the toolholder body such that a lead angle of the linear cutting edge is angularly adjustable with respect to an outer periphery of the body, including a discrete insert holder within the toolholder body, wherein the insert holder has a pocket on one side for receiving the body of the insert, and a fastener for pivotally connecting the insert holder to the wall;
• and
• a lock screw for securing the insert holder in a selected pivoted position such that the linear cutting edge of the insert assumes a desired angular orientation with respect to the outer periphery of the toolholder body.

An adjustable lead angle toolholder, comprising:

• a toolholder body having a distal end that includes a radially-oriented, planar wall;
• a cutting insert having a body with a linear cutting edge;
• a mounting assembly for pivotally mounting the insert onto the planar wall of the toolholder body such that a lead angle of the linear cutting edge is angularly adjustable with respect to an outer periphery of the distal end of the body, including an insert holder having a pocket on one side for receiving the body of the insert, and a fastener for pivotally connecting the insert holder to the wall;
• and
• a lock screw for securing the insert holder in a selected pivoted position such that the linear cutting edge of the insert assumes a desired angular orientation with respect to the outer periphery of the toolholder body.