Straight tracks are formed in a first direction on a base. A tire-based unit is associated with a tire of the vehicle and rotates with the tire. An isolation diaphragm coupling flange is provided to carry the isolation diaphragm assembly and includes a cutaway portion to provide thermal isolation. The laser beam 11 is interrupted with the cone form portion 15 of the measuring tool 8 through relative movement between the table 6 and measuring tool 8 before and after machining a work.