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Internal Sharp Edges
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Sharp edges selection mode:
Either press the
button
in the Work Mode Dialog
(if you are in Wizard Mode),
or display the Geometry
parameters in the parameter
tables.
The Geometry Table is displayed:
To start picking the required geometry, press the numbered button adjacent to the Internal Sharp Edges geometry parameter. This button displays the number of internal sharp edges that have already been selected. You are then prompted to pick the required geometry.
See Selecting / Unselecting Geometry.
See the cursor symbols in Cimatron when picking geometry.
Internal Sharp Edges define the edges that are to remain sharp after machining. When sharp edges are defined, additional parameters are available in the Tool Trajectory parameter branch. The use of these additional parameters, enables the selected edges to remain sharp after machining.
The Internal Sharp Edges parameter appears in the following Surface Milling procedures: Finish Mill All and Finish Mill By Limit Angle.
Once contour selection mode is invokedinvoked, the NC Contour Manager dialog is displayed when picking or editing boundaries or contours and manages all NC contour entities in the NC application. There are several ways to pick contours; see Picking Contours for details.
When internal sharp edges are selected, machining motions are lifted over these selected edges so that they remain sharp after machining. This shown in the examples below.
In this example, there is an internal sharp corner in the middle of the part.
To ensure that this edge remains sharp, select this sharp edge as one of the Internal Sharp Edges group.
The motions are now elevated above the sharp edge.
The tool reaches the point where it touches the sharp edge on one side. The following motion blocks are elevated until the tool re-touches the sharp edge on the other side. This motion trajectory will keep the sharp edge sharp.
See below for an additional method of handling internal sharp edges.
Notes:
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Contours that define sharp edges are 3-dimensional contours. They can be open or closed contours.
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These contours must constitute edges of part surfaces, or at least be very close to part surfaces.
Internal Sharp Edges - Another Method
Another method of handling internal sharp edges (if the geometry permits), is as follows:
Enter Part Surfaces selection and select the same sharp edge as a Manual Boundary.
In the Horizontal Machining Expansion parameter table, set Air Extension = 5mm. The resulting toolpath is split by the sharp edge into two halves, left and right. Because the sharp edge was defined as a Manual Boundary, the system created extensions beyond it, in both directions. The result is that the tool does not roll over the sharp edge.
Additional geometry selection methods are:
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