Patent ID: 8821079

Claim:
A single-sided indexable cutting insert ( 30 ) comprising: opposing rhombus-shaped upper and lower surfaces ( 32 , 34 ) and a peripheral side surface ( 36 ) therebetween, the peripheral side surface ( 36 ) having alternating obtuse and acute corner surfaces ( 38 , 40 ) separated by four relief surfaces ( 42 ), the two acute corner surfaces ( 40 ) representing the two furthest spaced apart corner surfaces; a central axis (A 1 ) passing through the upper and lower surfaces ( 32 , 34 ), about which central axis the cutting insert ( 30 ) is indexable; and a nose cutting edge ( 44 ) formed at the intersection of the upper surface ( 32 ) with each of the two acute corner surfaces ( 40 ), the lower surface ( 34 ) comprising: a base surface ( 46 ); and a central boss ( 48 ) and exactly two engagement ridges ( 50 ) protruding from the base surface ( 46 ), the central boss ( 48 ) having a raised boss end surface ( 52 ), and each engagement ridge ( 50 ) including a pair of parallelly extending ridge flank surfaces ( 54 ) forming a V-shaped cross-section, wherein each engagement ridge ( 50 ) intersects one of the acute corner surface ( 40 ) and extends therefrom towards the central axis (A 1 ) to intersect the central boss ( 48 ), and the base surface ( 46 ) is divided into at least two separate base sub-surfaces ( 56 ).