The Effect of Cutting Parameter towards Surface Roughness in Conventional Turning

The study was conducted with depth of cut, cutting speed, and cutting length as cutting parameters by
referring surface roughness as a standard. In the study, cutting parameter variations which were applied
were 0.25 mm, 0.5 mm, 0.75 mm of depth of cut; 50mm/rev, 80 mm/rev, 110 mm/rev of cutting speed; and 50
mm, 100 mm, 150 mm of cutting length by using carbide DCMT 070208-C25 as the tool. The maximum
surface roughness value, which was 4,35 µm, was produced at 0.5 mm of depth of cut, 50 mm/rev of cutting
speed, and 50 mm of specimen length. Due to the large depth of cut and low cutting speed, the tool could not
move along the specimen’s diameter and it resulted in threaded finish. Besides, chips which piled on the
tool’s edge also affected the specimen’s surface. The minimum surface roughness value, which was 0.76µm,
was produced at each cutting parameter variation of 150 mm of cutting length, 110 mm/revof cutting speed,
and 0.25 mm of depth of cut. This was because high cutting speed made the formed chips are passed off
along the specimen’s rotating movement which thus resulted in minimizing chips piling on the tool’s edge.
Besides, the high cutting speed could make the tool able to move along the whole specimen’s surface
diameter and it made the feeding even.