is mounted on a saddle 60 of the drive system 12 the first index part 6 has a rotational disk 51 a fixed disk 53 and a motor 52 workhead 4 is fixed on the rotational disk 51 the rotational disk 51 can be indexed in direction b by a motor 52 a conventional mechanism is used for this purpose the drive systems 12 13 move the workholder 4 and the toolholder 5 relative to each other the drive system 12 includes a saddle 60 a saddle 61 motors 62 63 and a guide 64 the saddle 61 is moved along the guides 64 64 on the bed in a direction z when the motor is driven while the saddle 60 is moved along the guide 65 on the saddle 61 in a direction x the drive system 13 has a motor 66 and a guide 67 the toolholder 5 is moved in a direction y when the motor 66 is driven now the toolholder 43 a rotation prevention means and a cutting oil supply device 201 will be explained with reference to fig1 and 5 the toolholder 43 which may be called a biteholder is inserted into the spindle 42 a positioning block 203 is detachably mounted on an endcover 41a this.