Arrangement in insert holders

An arrangement in an insert holder and a cutting insert, said insert (3) being received in a recess (2) in said insert holder (1) and secured therein by clamping between portions of said insert holder which define said recess, said recess for the insert (3) being defined on one side by a portion dimensioned to substantially unyieldably take up occurring stress and formed with a straight guiding portion (4,5) coacting with a straight edge of the insert, and, on an other side of said recess for the insert (3), by a nose-shaped resilient portion (8) of smaller extent in a longitudinal direction of said recess than the one side of said recess formed with the guiding portion, said nose-shaped resilient portion (8) having an inherent resilience, said insert (3) comprising a shank (14) wherein one side is formed with a guide means (15) adapted to the guiding portion (4,5) of said recess (2) and an opposite side comprises an inclined portion (16), and a free end (10) of said nose-shaped portion (8) being adapted to serve as an end stop for said insert and engage with a substantially transverse surface (19) on the insert, characterized in that the resilient portion (8) forming the other side of the recess is formed with a shallow projection extending towards the one side of the recess and has a defined projection top (12) of small extent in the longitudinal direction of said recess;

• that the inclined portion (16) of the shank (14) passes into a substantially straight surface portion (17) of the shank (14) which serves as a sliding and abutment surface for said defined projection top (12), and, in a direction away from said inclined portion (16), said substantially straight surface portion (17) converges slightly towards the one side of the shank (14);
• and that the inclined portion (16) is adapted, during insertion of said insert (3) into the recess (2), by engagement with the top (12) of said shallow projection, to bend the nose-shaped portion (8) against the inherent resilience thereof, and allow, during further insertion, engagement of the top (12) with said sliding and abutment surface (17) with a successive reduction of the bending of said nose-shaped resilient portion (8), said guiding portion on the one side of the recess of the insert holder comprises a pair of surfaces defining a substantially V-shaped groove (5), and that said guide means along the straight edge of the insert consists of a pair of surfaces defining a complimentarily V-shaped ridge (15), and that an angle defined between the surfaces of the ridge is greater than an angle defined between the surfaces of said groove.