# Expert System Based on Integrated Fuzzy AHP for Automatic Cutting Tool Selection
## 2 Proposed Methodology
### Tool Type Selection Model
\begin{table}
\begin{tabular}{c c c c c c c c} \hline \hline \multirow{2}{*}{**Mechlining Feature**} & \multirow{2}{*}{**Mechlining Type**} & \multicolumn{5}{c}{**Selection Criteria and Sub-Selection Criteria**} & \multirow{2}{*}{**Evaluation Criteria**} & \multirow{2}{*}{**Alternatives**} \\ \cline{3-3} \cline{5-6}  & & & **Shape** & & & & & \\ \hline \multirow{3}{*}{Face milling} & General, Thin & & & & & & & \\  & wall, Long & overhang, & depth, Side & & & & & \\  & Intermittent & & & & & & & \\ \hline \multirow{3}{*}{Shoulder milling} & General, & & & & & & & & \\  & Repeated, Deep, & & & & & & & \\  & Back milling & & Side & & & & & \\ \hline \multirow{3}{*}{Slot filling} & General Dep & Aspect Ratio, Width, & & & & & & & \\  & slotting & & Shape Type & & & & & \\  & Edge & General Dep & Depth, Length, Side & & & & & \\  & milling & & & & & & & \\ \hline \multirow{3}{*}{Pocket milling} & General milling, & & & & & & & \\  & Plunge & Depth, Width, & & & & & & \\  & & Plunge & & & & & & \\ \hline \multirow{3}{*}{Profile milling} & \(Z\)Level, & & & & & & & \\  & Contour, Copy, & & & & & & & \\  & Pencil & & & & & & & \\ \hline \multirow{3}{*}{IEM00, IEM10, IEM45, IEM90: indexable end mills with entry angles of 0\({}^{\circ}\), 10\({}^{\circ}\), 45\({}^{\circ}\), 90\({}^{\circ}\), respectively; IEM: indexable ball end mill; IEM: long edge end mill; FM00, FM10, FM45, FM65, FM90: face mills with entry angles of 0\({}^{\circ}\), 10\({}^{\circ}\), 45\({}^{\circ}\), 65\({}^{\circ}\), 90\({}^{\circ}\), respectively; SAFM: side and face mill; GM: groove mill; SEM: solid flat end mill; SEM: solid round end mill; SEM: solid ball end mill.} \\ \cline{1-1} \cline{3-3} \cline{5-6}  & \(Z\)Level, & & & & & \\ \cline{1-1} \cline{3-3} \cline{5-6}  & Contour, Copy, & & & & & & \\ \cline{1-1}  & Pencil & & & & & & \\ \hline \multirow{3}{*}{IEM00, IEM10, IEM45, IEM90: indexable end mills with entry angles of 0\({}^{\circ}\), 10\({}^{\circ}\), 45\({}^{\circ}\), 90\({}^{\circ}\), respectively; IEM: indexable ball end mill; IEM: long edge end mill; FM00, FM10, FM45, FM65, FM90: face mills with entry angles of 0\({}^{\circ}\), 10\({}^{\circ}\), 45\({}^{\circ}\), 65\({}^{\circ}\), 90\({}^{\circ}\), respectively; SAFM: side and face mill; GM: groove mill; SEM: solid flat end mill; SEM: solid round end mill; SEM: solid ball end mill.} \\ \cline{1-1} \cline{3-3} \cline{5-6}  & \(Z\)Level, & & & & & \\ \cline{1-1} \cline{3-3} \cline{5-6}  & Contour, Copy, & & & & & \\ \cline{1-1}  & Pencil & & & & & \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Tool type selection model for the main operations. thickness is less than 10 mm, the ratio is from 5 to 10 for every workpiece's weight, and the stability is low. The material removal capacity is defined as the ability to remove material from the workpiece. This depends on the cutting speed, cutting depth, and cutting width. Thus, it is quite different among all cutting tool types. The power requirement is related to the amount of machine power necessary for machining. The tool cost is the general purchasing cost of the cutting tool. Flexibility means the possibility of reusing the cutting tool for further applications. In the case of other machining operations, the same criteria structure is developed, while the first criteria have different sub-criteria and sub-sub-criteria, depending on the characteristics of each machining operation. This structure can be defined by experts to achieve suitable objectives regarding criteria, sub-criteria, and so on, using the proposed expert system.