A system for machining a component part having a race groove a along which ball elements run include a machine tool 3 for performing a machining operation on the component part, an acquisition unit 8 for acquiring information related to the machining operation, a control unit 4 for controlling the machine tool 3 based on the information acquired by the acquisition unit 8, a remote information processor 10 installed at a site remote from the control unit 4, and a communication system 9 for connecting the control unit 4 and the remote information processor 10 through a communication line 12. The remote information processor 10 has a capability of acquiring the information, acquired by the acquisition unit 8, through the control unit 4 and the communication line 12 and transmitting such information to the control unit 4 so that the component part can be machined to suit to a particular machining condition while satisfying a stabilized dimension.