Patent ID: 8651778
Filing Date: 2014-02-18
Classification: B23B,Y10T

Abstract:
1. A holder, comprising: a first insert pocket and a second insert pocket to which drill inserts are respectively attached are formed at a tip end side thereof, wherein the first insert pocket is located closer to a central axis than the second insert pocket, and an axial rake of the first insert pocket is larger than an axial rake of the second insert pocket the first insert pocket comprises a constraining seat face which is configured to contact a lower face of one of the drill inserts attached to the first insert pocket, and a constraining side face which intersects with the constraining seat face on a side of the central axis of the holder and contacts with a side face of the one of the drill inserts, the holder further comprises a wall face which extends in substantially the same direction as the constraining side face and is connected to a tip end face thereof and an outer peripheral face thereof located at a side of the second insert pocket, and D