Plane roughing operation 

The machining results of the plane roughing operation are usually closer to the source model when compared to the waterline strategy using similar parameters. This operation is used for machining models with significant differences to the defined workpiece model prior to rough machining, and for milling soft materials. A model being machined by the waterline roughing operation is assigned by a set of solid bodies, surfaces and mesh 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. 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 operation performs removal of the entire material of the workpiece, which lies outside of the model being machined and outside the restricting model. The work passes of the operation lie in parallel vertical planes. 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. To limit pressure on the tool, the depth of material removed can be defined. If the depth of the material being removed from the workpiece exceeds the defined depth, then the material will be removed in several passes. 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. If during machining, the tool must not cut any material that is over a userdefined angle, then the downward movement of the tool can be limited. The available types of limitation are: machining upwards only with maximum cutting angle without rest milling of the shadow areas, with a maximum cutting angle with rest milling of shadowed areas, and without downwards movement control. Transition between work passes can be performed via the shortest distance, with the addition of approach and retract moves, or via the safe plane. If material removal is performed is divided into depths, and then the system first removes the entire material at the first depth before starting on the next one. There is can to be used quick calculation method also.
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