Machining tool

Claim 1

A machining tool comprising: a holder; an axially adjustable, leading element having a shank and a head portion terminating at a tip; a hole in said holder, extending along the axis of said holder, and comprising means for receiving the shank of said leading element and for mounting said leading element in axially adjustable relation to said holder; said hole in the holder comprising means mounting said leading element for rotation about its axis; a cutting insert having inside and outside surfaces and a plurality of peripheral sides; a seating surface on said holder for mounting thereon the inside surface of said insert; a first locating surface on said holder for engaging a first peripheral side of said insert; a second locating surface on said axially adjustable leading element for engaging a second peripheral side of the insert; said first and second peripheral sides of the insert being angularly disposed to each other; said first and second locating surfaces being angularly disposed to each other in the same angular relation as the first and second peripheral sides of said insert; means for fixing said leading element in a predetermined axial position relative to the holder; means for fixing said leading element in a predetermined rotative position in which said second locating surface is positioned to engage the second peripheral side of the insert; a cutting edge along a third peripheral side of said insert, said third peripheral side being opposite said first peripheral side and extending angularly to said second peripheral side; an opening extending into said holder from said seating surface thereon; an opening extending through said insert from its outside to its inside surface and overlying said opening in the seating surface on said holder; a cam pin extending through said opening in the insert and into said opening in the holder; means in said openings mounting said cam pin for rotation between a locking position, in which said insert is fixed against movement relative to said holder and said leading element, and an unlocking position in which said cam pin and said insert are removable from said holder; and means on said cam pin for urging the insert's first peripheral surface toward engagement with said first locating surface and for urging the insert's second peripheral surface toward engagement with said second locating surface, in response to rotation of said cam pin to a locking position; said cutting edge on the insert extending radially beyond the periphery of said head portion of the leading element when the insert is mounted on the holder; said cam pin, said openings and said first locating surface comprising means for fixing the position of said cutting edge axially in relation to said holder, and for preventing adjustment in an axial direction of the fixed position of said cutting edge.