Nur Firstiawan. PARAMETER OPTIMIZATION OF MACHINING CNC
MILLING PROCESS OF SURFACE ROUGHNESS TEAK WOOD WITH METHOD
2
TAGUCHI. Thesis, Surakarta: The Faculty of Teacher Training and Education. Sebelas
Maret University, September 2012.
The purpose of this research is to know: (1) Effect of spindle speed variation, feedrate,
depth of cut and direction of the wood grain pieces (longitudinal, radial and tangential) to the
level of surface roughness result type CNC milling machining process ZK 7040 at teak wood
material. (2) Knowing which parameters that produce optimal roughness values on CNC
milling machining process on the material type ZK 7040 at teak wood material, using the
Taguchi method.
Teak wood machining process using CNC milling machine type 7040 with the ZK
control SIEMENS SINUMERIK 802S in SMK SAKTI Gemolong. The testing of moisture
content done in Laboratory of Materials, Civil Engineering, Sebelas Maret University.
Surface roughness test was done in metrology laboratory, Mechanical Engineering
Diploma Program, Vocational School, Gadjah Mada University. Optimization methods used
in this study the Taguchi method. TAGUCHI ANOVA (Analysis of Taguchi Varian) in Minitab
15 software help to determine the performance characteristics of the machining parameters.
The results of CNC milling machining process on the material type ZK 7040 teak was:
(1) higher spindle speed, will produce a surface roughness values less ie at level 3 = 3000
rpm; highe feedrate, will produce a surface roughness values greater ie at level 3 = 1200
mm/min; higher depth of cut,will produce value greater surface roughness is at level 3 = 6
mm, and more dry wood on the variation of direction wood grain pieces, would result in the
value of the smaller surface roughness is at level 1 = direction tangential cutting. (2)
Parameters that yield optimal surface roughness values are at 3000 rpm spindle rotation
speed, feedrate 400 mm/min, depth of cut 2 mm and tangential cutting direction. The feedrate
has the most effect with delta ratio S/N 3,78 and the direction of cutting wood has the smallest
contribution is a delta ratio S/N 1,92. (3) The optimal roughness is 4,12 ± 0,42 μm.
Key words: Wood machining, CNC milling, surface roughness, and Taguchi
metho
