machining with lammps

It is possible to give advice, but for that you first have to provide more detailed information and explain the problem and the steps you did (and why) to resolve the problem.
That you provided a picture is helping a lot, the remainder of the information is very vague and poor, though. Please have a thorough look at the forum guidelines and follow the suggestions given there. Please also try to find somebody that can help you with writing in english and that can correct your grammar and spelling. That will make it much easier to understand what you are asking.

Please also note, that similar simulations have been discussed in the past, so there should be useful information in the archives. Similarly, helpful information should be in publications about the process. Some are even listed with pictures in the corresponding section of the LAMMPS home page.