| 摘要 |
The present invention relates to a control method and a control apparatus for controlling two (two kinds of) driver mechanisms for relatively moving a main spindle along a single axis in an NC machine tool whereby the straightness of the work-piece machined surface can be finished with high accuracy. The control method of the invention controls operations of two driver mechanisms (124,125,126) for relatively moving a main spindle (104) along a single axis in an NC machine tool (100), and one of the driver mechanisms (124 or 125,126) is driven to relatively move the main spindle (104) in a positive direction along the axis during machining, the other driver mechanism (124 or 125,126) is driven to relatively move the main spindle (104) in a negative direction along the axis during machining. Since the respective driver mechanisms (124,125,126) are driven to move the main spindle (104) in only one of either the positive or negative direction along the axis, respectively, when the moving direction of the main spindle (104) is reversed, without being affected by backlash, the main spindle (104) can be positioned with high accuracy.
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