1. The body structure is composed of gearbox and universal joint head. It is easy to adust the processing hole distance without rsticion of gears, saves adjustment time, and has ,few dead angle restrictions. It is suitable fou processing workpieces close to circular distr bution holes. lts gears, bearings, output shafts and universal joints all adopt strong series, which is suitable for processing steel parts and other strong occasions. In order to ensure the life of universal joint, the moving range should not exceed 15 degrees, which is equal to about 30 mm before and aler perpend cularity.

2. According to the product drawings and the hole distance coordinates of the work, the strucure of the gearbox is designed, that is, the fixed boring position.