Abstract
The cutting resistance, cutting temperature, cut surface roughness, tool wear, chip treating and others of free cutting aluminum alloys 2011-T3 and 2011-T8, a high strength alloy 2017-T4, 5056 alloys having different compositions and newly developed free cutting alloys G67-T6 and G67-T8 were examined. Those of a free cutting brass and a free cutting steel were also tested for comparison. 2011 alloys are excellent in machinabilities especially in the tool flank wear and the chip treating. G67 alloys have similar turning machinabilities as 2011. All the 5056 alloys have nearly the same turning machinabilities a little better than 2017 having poor machinabilities. Both the turning and drilling machinabilities show nearly the same tendencies.
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