Patent ID: 7118462

Claim:
A method of machining a disk for a toroidal-type continuously variable transmission, the disk including: a first side surface having a first traction surface and a second flat surface portion; and a second side surface having a second traction surface and a first flat surface portion, the method of machining the disk comprising: fixing an annular disk to a core bar having a pair of reference portions for rotation at both ends thereof; clamping the pair of reference portions by a first center on a main spindle side of a finishing machine and a second center opposing the first center; abutting a first flat surface portion against a reference for axial abutment attached to the main spindle; machining a first traction surface while rotating the disk; unclamping the core bar; inverting the disk with the disk fixed to the core bar; clamping the pair of reference portions by the first center and the second center; abutting a second flat surface portion against the reference for axial abutment; and machining a second traction surface while rotating the disk.