Patent ID: 7240593

Claim:
Apparatus for machining a workpiece, which includes a holder having an axis extending in front and rear directions and having a holder front mating end, and a head with a rear mating end fixed to said holder front mating end, said head forming a pocket and including a cutting insert mounted in said pocket, said holder front mating end and said head rear mating end are constructed with one having a projection and the other having a recess that closely receives the projection, to accurately locate the head and the cutting insert thereon with respect to the holder, said holder front mating end and said head rear mating end having aligned screw-receiving holes with one of said holes being threaded and including a screw that extends at least partially through said holes to fasten said head to said holder, wherein: said projection and recess each having interfitting surfaces that form a projection and recess with perimeters that lie outside said screw-receiving holes and that precisely align said head to said holder; as seen in views taken along said axis, said projection and said recess each has a pair of vertical parallel opposite sides with portions lying on opposite sides of the corresponding screw hole and with said screw holes each lying directly between locations on said vertical parallel opposite sides, said parallel opposite sides being spaced apart at a constant distance so said projection can be inserted into said recess by movement of one towards the other along said axis.