4. Structural Body Components Closely Allocated Around Machining Space—Core for User-oriented Platform System

As will be clear from Chap. 2, the leading structural body components are the headstock, tailstock and turret head in the turning centre (TC), and the spindle head and table in the machining centre (MC), when discussing the machining space. More specifically, the function and performance specifications of the machining space can be determined by the (1) spindle nose and tapered hole at the face-end of spindle, (2) barrel and its tapered hole in the tailstock, and also (3) tool seat in the turret head, where the attachment and tool are mounted on through the tapered hole, bay-type flange, tenon-slot joint and so on. In addition, we must understand the (4) allowable maximum cutting torque for the main spindle and table, and if possible, the (5) on-site calculation method of the cutting force.