近两年来,我队新到了一些北京500型转盘钻机。这种钻机具有一定的先进性,如机械化程度较高等,但个别部件也有某些缺点或不足。今年初,我队有两台机器的回转体坏了,又没有铸工,照原件 In the past two years, our team has newly arrived some Beijing 500 turntable rigs. This rig has some advanced, such as a higher degree of mechanization, but individual components also have some shortcomings or deficiencies. Earlier this year, my team had two machines rotating body is broken, there is no cast, according to the original