I usually machine parts of my castings on a lathe or mill. They do not machine well, especially with a carbide tool. HSS seems better. Is there anyway to improve this thru the use of flux or other additives? How is the 6061 barstock I am familiar with different? I seem to get short broken chips instead of continuous. The material also seems more porus. Do I need to de-gas it? If so how? I did not see a thread about this.