When precise machine elements as ballscrews supported by both centers on machine tool have been machined, there are several machining errors due to defects of machine tool itself, machining conditions and environment states, etc..
In this thesis, as a problem of machine tool itself, influences of setting errors such as mis alignment between both centers, run-out of spindle and unsuitable contact conditions between the center and the center hole on the lead and the radius error of ballscrews are analytically investigated by computer simulation.
Among the setting errors, in order to detect the alignment error that can be generated by precision, wear, thermal deformation of machine tool and so on, an optical measurement system using Laser and photodiode was developed. Applying this system to lathe, the alignment error against sliding of carriage in the ends of a workpiece along the position of tail stock was precisely measured.
A adjustable center for 2D arbitrary position was designed and produced to remove the alignment error in machining the workpiece supported by both centers. Practically it is certain that this proposed measurement and adjustment system can be effective in reducing machining errors as above.
