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The information in this document is confidential and may not be disclosed without the permission of B/E Aerospace. 2011 B/E Aerospace, Inc. All rights reserved.
Assemblies Concepts
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The information in this document is confidential and may not be disclosed without the permission of B/E Aerospace. 2011 B/E Aerospace, Inc. All rights reserved.
Learn the basics of creating and managing assemblies.
Understand the terms and concepts used in the NX Assemblies application.Comprehend the way NX organizes assembly files and structures.
Grasp the advantage of setting preferences for assemblies.
Master the best methods to navigate through the Assemblies application and
toolbar.
Assembly Concept-Introduction
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The information in this document is confidential and may not be disclosed without the permission of B/E Aerospace. 2011 B/E Aerospace, Inc. All rights reserved.
Overview: There are six terms to be familiar with whenworking in the Assemblies application: Top-Down,
Bottom-Up, Work Part, Displayed Part, Loaded Part,
and Design In Context.
Terminology
Top-Down
Top-Down assembly modeling allows you to create and/or edit componentgeometry (piece parts) at the assembly level. Because you can create and edit
directly in the assembly, you can take advantage of each existing component's
geometry and location in the design of new component parts. All creation and/or
editing done at the component level automatically reflects in the component's
part file.
Bottom-Up
Bottom-Up assembly modeling implies that all individual part files (piece parts)
comprising the assembly already exist. You simply add these existing parts to
create the assembly. Bottom-Up modeling is analogous to building a toy model,
the pieces are already created, and you need only to assemble them.
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Work Part
The Work Part is the current part in which you can create or edit geometry. When you are workingin a component part, the Work Part is the same as the Displayed Part. When working in an
assembly, you can make one of the components your Work Part; all other components become
temporarily unavailable. The Work Part name displays in the title bar of the Graphics window.
The Work Part is the part on which you are currently working. Select Assemblies | Context Control |
Set Work Part, or double-click the part in the Assembly Navigator to designate a part as the Work
Part. All new geometry is created in the Work Part. When you save a file, the Work Part and all
components of the Work Part save. The Work Part is also the part file to which components are
added, removed, repositioned, renamed, and substituted.
Displayed Part
The Displayed Part is the part currently displayed in
the Graphics window. The Displayed Part name
appears in the title bar of the Graphics window.
Terminology
Loaded Part
A Loaded Part refers to any open part. When an assembly file is opened, all of its
components also open when Load Components is set to All Components using File | Options |
Assembly Load Options. You can find out which parts are loaded by reviewing the contents of
the list in the Change Window dialog, which is accessed by selecting Window | More.
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The information in this document is confidential and may not be disclosed without the permission of B/E Aerospace. 2011 B/E Aerospace, Inc. All rights reserved.
Design In Context
NX makes it possible to create and edit componentswhile in the assembly. This functionality is known as
designing the part in the context of the assembly. This
approach causes the change to occur simultaneously at
both the assembly and the component level. In order to
modify a component in the assembly file, you must first
set the component as your Work Part.
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The Assembly File
The assembly file is nothing more than a part file that contains component geometry. It is
created by selecting File | New or Assemblies | Components | Create New Component. The bestway to think of an assembly file is to consider it as a collection of components and other sub-
assemblies with their own components. Assemblies can have many levels, where each level
contains components of some upper-level assembly, as shown in the above figure.
In this example, the assembly part file is at the top of the assembly tree. The sub-assembly files
are both components of the top level and assemblies themselves, containing other components.
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Assembly Application and Toolbar
Assemblies Application
An Assemblies license is accessed by selecting Start | Assemblies. A border displays around
the icon next to the Assemblies menu command when you have the license. This application is
different from Modeling or Drafting in that it is not exclusive. You can use the Assemblies
application while you use another application, such as Modeling or Gateway. With the
Assemblies application active, the Assemblies toolbar displays, and several options display on
the Assemblies menu. You can perform many basic assembly tasks without using the
Assemblies application, such as changing reference sets or using the Assembly Navigator.
Link
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Assembly Navigation
Assembly Navigator
The Assembly Navigator window contains a tree-structure representation of the assembly. Each
component in the assembly's tree displays as an entry,
or 'node', in the Assembly Navigator. Use these nodes
to select components as you would in the Graphics
window, whenever you are prompted for a selection.
When working in an assembly with more than a few
components, the Assembly Navigator is the most useful
tool you can have. It makes visualizing the assembly
structure vastly easier, and enables you to save time.
Use it as often as possible.
Columns
Dependencies panelPreview panel
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Assembly Navigation
Columns
The Assembly Navigator has a multitude of columns
that can be activated to filtered information to meet your
specifications.
The latest addition to the column selection is the Info
column. It displays component information in the form
of an icon, or information that does not change the
default behavior of the part.
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Assembly Navigation
Preview panel
A preview panel resides in the Assembly Navigator to
assist you in loading or adding the correct component
into the assembly. Selecting a component from the
Assembly Navigator loads an image of the component
in the preview panel. The image loads for part files
saved with a preview image in NX 1 or later.
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Assembly Navigation
Dependencies PanelThis panel allows you to view the parent and child
relationship as well as the mating and WAVE
dependencies a given component has in the rest of the
assembly.
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Assembly Navigator Component Pop-up Menu
If you place the cursor over a component and right-
click, a pop-up menu displays allowing you to perform
operations on the assembly structure.
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Assembly Navigator Component Pop-up Menu
Make Work Part
This command is the same as selecting Assemblies | Context Control | Set
Work Part or double-clicking the node in the Assembly Navigator.
Make Displayed Part
When you make a component the Displayed Part, only that part and its
components display in the assembly tree and the Graphics window.
Display Parent
This submenu is only available when you pick a part that is a component ofsome other part (i.e., at least a first level sub-assembly). It displays a list of the
component's parents. In the example, the component 'shcs5_13_55' is a piece
part of the assembly 'b_sub_ejector' which in turn is a component of a top level
assembly called "b_subassy" The part you select becomes the new Displayed
Part. All of the components of the Displayed Part become visible in both the
assembly tree and the Graphics window.
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Assembly Navigator Component Pop-up Menu
Open
Selecting Open displays a submenu listing the open
commands. This allows you to work with an assemblystructure in which the components are not loaded.
Component
This command is available when components are
unloaded in the assembly structure. The component is
partially loaded unless Use Partial Loading is inactive in
the Load Options dialog. This is the same as clicking an
empty check box.
Component As
This command is available when components are
unloaded in the assembly structure. It allows you to
open the component using a different version or name.The component selected must have the same internal
identifiers as the original component unless Allow
Substitution is active in the Load Options dialog. Note:
If the component is a sub-assembly and you want to
open the component's entire tree, use Assembly As.
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Assembly Navigator Component Pop-up Menu
Child Components
This command is available when a component such
as a sub-assembly is opened but has one or severalunloaded child components. This loads all of the child
components.
Assembly
Opens the entire assembly and all componentsregardless of the Load Components setting on the Load
Options dialog. The components are partially loaded
unless Use Partial Loading is inactive in the Load
Options dialog.
Assembly As
Works the same as Component As except that all
the components in the referenced sub-assembly file are
opened.
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Component Fully
Loads the complete part file for a partially loadedcomponent.
Close
Selecting Close displays a submenu listing the close
commands.
Part
Closes the selected component.
Part (modified)
This command is only available if the part you are
about to close has been changed.
Assembly
Closes all of the parts in the current assembly.
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Replace Reference Set
This submenu allows you to replace reference sets for components. These reference sets control what is
displayed and loaded into the assembly structure. You can select any created reference sets, for example,
SOLID, or you can use the default sets Empty or Entire Part to control the display. When you select Replace
Reference Set, the submenu lists the current available reference sets.
Substitute
Use this to replace a component with another component.
Mate
Use this to mate a loaded component to the assembly.
Reposition
Use this to reposition a component within an assembly.
Arrangements
Select this to switch from one assembly arrangement to another. You can also edit an arrangement.
Structure Editing
Delete removes the selected components from the assembly. The Cut, Copy, and Paste commands allow
you to move components from one level of the assembly structure to another. Hide hides the selectedobject in the Graphics window.
Show Degrees of Freedom
Show Degrees of Freedom displays the degrees of freedom indicator in the graphics window. This set of
arrows indicated the directions the component can freely move and is not constrained by Assembly
Constraints.
Properties
Properties lets you view and change information, parameters, and attributes for a selected component
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Reference Sets
What is a Reference Set?
A reference set is a subset of a component's geometry that you
can use to control the way the component displays in an
assembly. Any given part has at least one solid body, probably
several sketches, datum planes and datum axes, and perhaps
other curves and geometry. To simplify the component's display
in the assembly, you can create a reference set named "SOLID,"
and define it to contain only the solid body.
A reference set is a subset of a component's geometry that you
can use to control the way the component displays in anassembly. Any given part has at least one solid body, probably
several sketches, datum planes, datum axes, and perhaps other
curves and geometry. In a component file, you can relegate all
this extra geometry to different layers, and then view only the
layers you want to see. In an assembly, however, using layers in
this manner can pose a problem. If you have an assembly with a
hundred components, moving the sketches, datums, and curves
for each component to different layers is not only tedious, but
you soon run out of layers to use.
The solution is to define a reference set for each component that
only contains the geometry you want to view in the assembly;
you can also activate the Add Components Automatically option
and specify if new components are to be automatically added to
the reference set. For example, you can create a reference set
named "SOLID" and define it to contain only the solid body.
When you add the part to the assembly, and tell it to use the
SOLID reference set, you eliminate all the unnecessarygeometry from the assembly display.
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Common Reference Set Practices
By default, every part has three reference sets: EntirePart,which contains all the part's geometry; Empty, which contains nogeometry at all; and Model, which contains the part's solid body.In legacy situations, many companies may still require you to
manually create a reference set called SOLID, containing only
the solid body. Beyond these types of reference sets, you can
create reference sets showing construction geometry, basic
outline curves, simplified representations, or datum's required for
mating. Furthermore, an assembly itself can use a reference set,
where you add only certain components to show different
assembly configurations.