There are 4 nests in this machine. They are fixed on the machine from lift to right in a linear way. And one drilling unit is installed on the rail way which is face to the 4 nests. Manual loading the body one by one to the 4 nests and lock it in position. The drilling unit will move to drill inside holes (rotating different degree ) on the first body in the 1st nest. The drilling work will be done in request from the 1st nest to the 4st nest. After the inside holes drilling work, manual unloads the finished body from each nest.