Abstract: This article has focused on using plain language introduction to the general machine tools in the design process of C6140 spindle, first by studying the background and significance of the topic's introduction, to elicit the significance of this design. And then were prepared from the parameters, transmission design, estimation and checking transmission parts, components structural design and checking 5 spindle components for the design part. The gears, belts, pulleys, bearings, cabinet and other key design parameters.