Complex operation (waterlineplane) 

The complex operation consists of two finishing operations: plane and waterline. Parameters of these operations are set in such a way, that any flat areas are machined by the plane operation and any areas that are close to the vertical – by the waterline. As a result, the system achieves consistently good machining quality over the entire surface of the model. The complex operation provides easier working conditions for the tool; this makes it possible to use longer tools with a smaller diameter. Use of the optimized plane operation allows the user to perform quality machining of models with a complex surface shape, and also minimizes the machining time. Parameters for the operations are interconnected; this means that when a parameter is changed in one operation, the same value will be applied to an identical parameter of the other operation if one exists. This rule makes it necessary to adjust both operations separately. The default set of parameters for the plane and the waterline operations are identical to the normal set of parameters for these operations. In order to achieve an optimal result when creating a pair of operations their parameters are filled in the following way. For the plane operation, the minimum and maximum slope angles from the normal to the Zaxis are set to 0 and 45 degrees for the plane operation and to 45 and 90 degrees for the waterline operation. This means that if an area of a surface has a slope less than 45 degrees, then it will be machined using the plane operation; otherwise the waterline operation will be applied. A model being machined for the complex operation is assigned by a set of solid bodies, surfaces and meshed objects. For every geometrical object or a group of objects, an additional stock, which during machining will be added to the main stock of the operation, can be defined. If a workpiece and a restricting model are not defined, then the system performs machining of the entire available surface of the model being machined. Otherwise only those surface areas will be machined, which lie within the workpiece and outside the restricting model. The workpiece can be assigned as a cube, cylinder, a mould with stock or prismatic form, as residual material after machining by previous operations, and also as a freeform geometrical model, consisting of solid bodies, surfaces, meshes and prisms whose bases are projections of closed curves. In the restricting model, solid bodies, surfaces and meshes which are required to be controlled during machining, and also machining areas and restricted areas, defined by projections of closed curves can be defined. The work passes of the operation lie in two parallel vertical planes. The planes of different operations are perpendicular to each another. The positions of the planes are defined by the angle between these planes and the Zaxis. The step between the planes of neighboring work passes can be either fixed or calculated according to the defined height of the scallop. When using a local coordinate system or a rotary head, the position of the model being machined will not change, the tool rotation axis is parallel to the Z axis of the local coordinate system, and all work passes are located in planes that are perpendicular to the horizontal plane of the local coordinate system. It is also possible to restrict machining from entering areas of the restricting model and areas of edge rounding in the resulting toolpath. Joining of the work passes into a single toolpath can be performed going downwards or upwards. Transition between neighboring work passes can be performed on the surface, using retract and approach moves or via the safe plane.
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