| OCR Text |
Show Current operation list Remaining operation stacks feature 1 (Fl) feature 2 (F2) feature 3 (F3) feature n (Fn) step 3 of Fn Figure 6.1. Structure of list and stacks after decomposition counterBore( pt(2.0, 0.0, 0.0), 1.4, 0.3, 1.0, 1.5, nil, nil ); 34 Then, the decomposition rules produce set of operations with the structure de-scribed in Figure 6.2. The hole feature would be decomposed into spot drill and drill operations. The counterSink feature would produce a set of spot drill, drill, and countersink operations, while the counterBore feature would produce a set of spot drill, drill, and counterbore operations. In the figure, Sdrill, Cbore, and CSink means spot drill, counterbore, and countersink operation respectively. Spot drill operations and drill operations are numbered so that they can be distinguished each other. Since hole diameters are the same in all three features, drill operations would use the same twist drill. Even though the depth of hole differs, it does not |
