Geometry model of roller bit's sphere tooth, wedgy tooth and bucketshape tooth were established;
建立了牙轮钻头的球形齿、楔形齿和勺形齿三维空间的几何模型；
2
Because the closestool body is of a bucketshape, the utility model has low cost and simple manufacture method.
本实用新型由于马桶体是一个水桶形，具有造价低、制造方法简单。
3
Based on an analysis on the variation of cutting edge length of symmetrically shaped bucket in slewing conditions, a non-symmetrical bucketshape is presented.