SURFACE ppt

[NX8-HELP] SURFACE 1 Surface drive24ward (meslab.org/mes) Surface View a topic Four Point Surface Sheets From Curves Bounded Plane Transition Through Points and From Poles From Point Cloud Ribbon Builder Midsurface Patch Openings 1. Four Point Surface Use the Four Point Surface command to create a surface by specifying four points. This is useful for creating base surfaces that support the surface based Class-A workflow. You can easily modify such a surface by increasing the degree and patch into a more complex surface with the desired shape. You must follow these point specifying conditions:  No three selected points can be collinear.  No two selected points can be the same or at the very same location in space.  Four points must be specified to create the surface. If you specify three or fewer points an error message is displayed. Four Point Surface Where do I find it? Application Modeling Menu Insert→Surface→Four Point Surface [NX8-HELP] SURFACE 2 Surface drive24ward (meslab.org/mes) 1.1. Create a surface using four points 1. Choose Insert→Surface→Four Point Surface to open the Surface by 4 Points dialog box. 2. Select the four surface corner points in the graphics window. You can specify the four points using any of the following methods: o Select an existing point in the graphics window. o Select any arbitrary point in the graphics window. o Define the coordinate location of a point using the Point Constructor dialog box. o Select a base point and create a point offset from the base point. Note The Snap Point options are useful when you want to specify an existing point on a particular curve or surface. 4. Four specified points 5. Specifying subsequent points displays a polygonal preview on the screen. You can modify any points before finalizing the shape of the surface. 6. Change the location of the points as required. 7. Relocated specified points 8. Click OK or Apply to create the surface. 9. Four Point Surface feature [NX8-HELP] SURFACE 3 Surface drive24ward (meslab.org/mes) 1.2. Four Point Surface options Specify Points Specify Point 1 - 4 Lets you select the first, second, third, and fourth points for the four point surface. Preview Preview Select this check box to see a preview of the resulting surface. 2. Sheets From Curves This option lets you create bodies through selected curves. Note Many illustrations in this section use solid fill shading to represent wire frame parts. The fill often hides portions of curves that would be visible in a wireframe model. The purpose is to represent the concepts with clearly recognizable figures at the loss of some technical viewing accuracy. Local Settings When you choose Sheets From Curves, the following options appear: Cycle By Layer Processes all selectable curves one layer at a time. To speed up the processing, you may wish to turn this option ON. This causes the system to create bodies by processing all selectable curves one layer at a time. All the curves defining a body must be on a single layer. Note Using the Cycle By Layer option can significantly increase processing performance. This option also significantly reduces the use of virtual memory. If you receive the message: Virtual Memory Exhausted, you may want to spread the wireframe geometry over several layers. But be sure to place all defining curves for a body on a single layer. [NX8-HELP] SURFACE 4 Surface drive24ward (meslab.org/mes) Warnings Causes the system to stop processing and to display warning messages after generating bodies, if there are any warnings. You are warned about nonclosed planar loops of curves, and non planar boundaries. If you select OFF, you are not warned, and processing does not stop. Basic Procedure To convert curves to sheets, you must: 1. Set the Cycle By Layer toggle switch as desired. 2. Set the Warnings toggle switch as desired. 3. Choose OK. 4. Choose the curves you wish to sheet using the Class Selection Tool. 5. Choose OK. The message Creating Bodies appears during this stage of processing. The system then uses all selected curves to generate bounded planes, cylinders, extruded bodies, and truncated cones. Tips and Techniques You can generate bodies using any planar curve. Sheets From Curves creates the following bodies:  Bounded planes - by forming planar closed loops (using the ends of curves) Note Single planar loops must be periodic.  Cylinders - by pairing circles and ellipses with coaxial centers.  Cones - by pairing arcs with coaxial centers.  Extruded bodies - by pairing conics and planar splines. They must be on parallel planes and one must project onto the other (via a translation perpendicular to the planes of the curves). You can create bodies on one plane using:  Loops of objects - These form a bounded plane. For example, the adjoining lines on any face of a simple rectangle. You can create bodies between two parallel planes using:  Coaxial arcs - For example, two circles with the same radius become a cylinder, and two circles having different radii become a cone. In both cases, they share the same axis and are parallel.  Identical splines, parabolas, ellipses, hyperbolas - These form an extruded body; for example, the thickness of the sole of a shoe. Note Two coaxial conics do not always have to lie on parallel planes. An ellipse and arc on nonparallel planes can match and form a body if they are both segments of the same cylinder. These objects appear similar when viewed along their common axis. See the figure below. [NX8-HELP] SURFACE 5 Surface drive24ward (meslab.org/mes)  Sheets From Curves does not create spherical sections. Before using this option, you must create sheets at all sections of spheres. This option also does not create typical ruled sheets. 2.1. Sheets From Curves Design Considerations Sheets From Curves usually develops the sheets you desire. However, you will be successful if you follow certain design requirements: Guiding Lines Use guiding lines in ambiguous situations - You must connect defining arcs/ellipses if there are more than two, and they are coaxial and geometrically similar (that is, the same size in degrees but not necessarily in arc length). Otherwise the processor cannot determine which object to connect. See the figure below. You must use arcs (not ellipses) to generate cones. The system always generates truncated (nonpointed) cones. It is always safest to create guiding lines using arc endpoints. But you can connect any points on two circles if the guiding lines do not touch. If they do touch, you must use arc endpoints. See the figure below. [NX8-HELP] SURFACE 6 Surface drive24ward (meslab.org/mes) "Soft Edge" Recognition - It is not necessary to create guiding lines to form a bounded plane if there are only two identical coaxial arcs limiting the plane. See the figure below. Guiding Line Rules When in doubt - use a guiding line. In the figure below, area A shows that two coaxial arcs of the same size do not require guiding lines. The processor is able to match the partial arcs and the full arcs without additional help. However, in area B you must indicate whether the circles should form cones or cylinders. Area C requires you to match the 4 lower arcs with 4 upper arcs. Because there are more than 2 similar coaxial arcs you must connect the arc endpoints of the matched arcs. That requires eight guiding lines. [NX8-HELP] SURFACE 7 Surface drive24ward (meslab.org/mes) Bounded Plane Rules Bounded plane object members must form a single unambiguous closed loop. A closed loop does not split and has no "dangling" object. Therefore the loop is reliably chainable. In the example shown in the figure below, the boundary members of both front faces do not chain because the upper line segment extends outside of each boundary. [NX8-HELP] SURFACE 8 Surface drive24ward (meslab.org/mes) Normally the solution is to create two segments. However, in this particular example, the following requirement further prevents sheet generation. Only two coplanar objects can share an endpoint. This option cannot reliably create a body if a boundary member object shares a common endpoint with more than one other object on that plane. In the figure below, even though you subdivide the dangling line, you still may not succeed in creating bodies the front faces. This is because each face has more than 2 coplanar objects that meet at a vertex. Notice that lines 1, 2, and 3, in the figure below, are all on the same plane. They also share a common endpoint. No. 1 effectively becomes a dangling line and that face is not turned into a sheet. Lines 1, 2, and 4 present the same problem in another plane. You must manually create sheets for these faces. Bounded planes must not contain more than two colinear line segments. You cannot create a sheet if three or more sequential lines are colinear. In the figure below, the front slope is moved towards the center of its front face. The processor cannot create a bounded plane for the top sheet using the three colinear lines. [NX8-HELP] SURFACE 9 Surface drive24ward (meslab.org/mes) You can generate a trimmed bounded plane if the interior objects do not touch or cross the boundary. Assemblies Place multiple assembly components on separate layers. They often have curves that cross or touch. The figure below shows the bottom component trimmed by the base of the top component. The base of the top component is not turned into a sheet either. Multiple components on a single layer can cause more than 2 curves on the same plane to share a common endpoint. Therefore, the bodies might not be properly created, or created at all. See the figure below. [NX8-HELP] SURFACE 10 Surface drive24ward (meslab.org/mes) Invalid Sheets Trimmed Cylinders - You cannot generate a trimmed cylinder. The interior curves are either ignored or converted as usual. Not all sheets are generated, such as unknown sheet types and sections of spheres. See the figure below. [...]... Modeling Toolbar Menu 7.1 Surface Surface Drop-down→Ribbon Builder Insert Surface Ribbon Builder Create a ribbon sheet 1 Choose Insert Surface Ribbon Builder 2 In the Ribbon Builder dialog box, in the Profile group, click Select Curve curve or edge(s) representing the shape of the ribbon sheet you want to create Surface and select the drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 30 3 Under Offset... Continuity    G0 (Position) G1 (Tangent) G2 (Curvature) Note A surface must be selected to use G2 (Curvature) You cannot assign G1 (Position) or G2 (Tangent) continuity to the faces comprising the bottom of a Transition feature Settings Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 19 Create the Transition feature as a surface Create Surface Note Only bridge curves are created if this check box... animation Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 12 Two different bounded planes created on the same surface, one with holes and one without Selection Intent's Tangent Curves rule used to create a bounded plane without holes Selection Intent's Region Boundaries rule used to create a bounded plane with holes Where do I find it? Application Modeling Toolbar Menu 3.1 Surface Surface Drop-down→Bounded... the center) Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 31 8 Midsurface The Midsurface function is used mainly from the Advanced Simulation application, but it is available here in Modeling as well Advanced Simulation's model idealization uses a simplified model whose behavior can be utilized to model the behavior of a more complicated system This is performed using the Midsurface feature... the patching surface by using dividing curves to break up the opening Create the patches as one feature, or as multiple features Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 32 The image shows the command used to patch a collection of sewn sheet bodies — Selected edges of openings to patch — Patch Openings feature Where do I find it? Application Modeling Toolbar Menu 8.2 Surface Surface Drop-down→Patch... selected limit points Remove Limit Points Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 36 Joggle Options Available when Type is set to Joggle Specify Point Lets you specify points that define the boundary of the limit path for creating the shelf surface Point list Shelf Length Sets the length of the shelf surface Sets a rounding radius for the shelf surface Shelf Radius Cutout Length The shelf... Transition feature before you create it 10 In the Settings group, select the Create Surface check box to create the Transition feature as a surface If you do not select this check box, only bridge curves are created 11 Click OK or Apply to create the Transition feature Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 16 12 Transition feature 4.2 Transition options Sections Lets you select the... values Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 29 Points too sparse to constrain sheet body Use more points, reduce the degree or restrict the boundary The above error message is displayed when the number of points and/or their distribution on particular patches, is not large enough The distribution of the points on the proposed surface is very important each patch on the proposed surface. .. Patch Openings feature Where do I find it? Application Modeling Toolbar Menu 8.2 Surface Surface Drop-down→Patch Openings Insert Surface Patch Openings Patch multiple openings 1 On the Surface toolbar, from the Surface Drop-down list, select Patch Openings or choose Insert Surface Patch Openings In the Patch Openings dialog box, in the Face to Patch group, Select Face is active 2 Select the faces that... continuity, and their flow direction List window Select (or deselect) a surface to change the flow direction at the selected section Changing the continuity of one section changes the continuity of all sections Constrain Faces Surface drive24ward (meslab.org/mes) [NX8-HELP] SURFACE 17 Lets you select faces to specify the constrain surfaces Select Face Support Curves Show All Points on Section Displays . Insert Surface Four Point Surface [NX8-HELP] SURFACE 2 Surface drive24ward (meslab.org/mes) 1.1. Create a surface using four points 1. Choose Insert Surface Four. Cloud Ribbon Builder Midsurface Patch Openings 1. Four Point Surface Use the Four Point Surface command to create a surface by specifying four