Transcript Document 7114703

Chapter 6
Creating and Documenting
Assemblies
Chapter 6 - Objectives
• After completing this chapter, you will be able to perform the following:
– Understand the assembly options
– Create bottom-up assemblies
– Create top-down assemblies
– Create subassemblies
– Constrain components together using assembly constraints
– Edit assembly constraints
– Create adaptive parts
– Pattern components in an assembly
– Check parts in an assembly for interference
– Drive constraints
– Create a presentation file
– Manipulate and edit the Bill of Materials (BOM)
– Create individual and automatic balloons
– Create and perform edits on a Parts List of an assembly
Creating Assemblies
• New Assembly Files
– .IAM Extension
• New icon – What To Do
• New – File Menu
• New icon – Down Arrow
Creating Assemblies
• Assembly Options
– Tools > Application Options > Assembly tab
The Assembly Capacity Meter
• Number of
occurrences in
active assembly
• Number of open
files
• Memory (RAM)
used
• Application Option
Creating Assemblies
• Assembly Browser
– Part Occurrence
– Assembly Constraints
– Subassembly
Occurrence
Creating Assemblies
• Bottom-Up Approach
– Components are created in their individual files
– Place Component tool
– ‘P’ hot key
Creating Assemblies
• Create Components in Place
– Create new components while in an assembly
– Create Component tool
– Create In-Place Component Dialog
•
•
•
•
•
•
Component Name
Template to be used
File Location
Default BOM Structure
Virtual Component
Constraint to selected face
Creating Assemblies
• Occurrence
– Copy of existing
components
•
•
•
•
Copy/Paste
Ctrl Select Multiple Files
Place Component
Drag & Drop
– Any change to original
updates all occurrences
• Save Copy As… to create a
copy that is not linked to
original
Creating Assemblies - Editing
• Occurrence
– Active Component – Available for edit
• Double-click in the graphics area
• Double-click file name/icon in the Browser
• Right-click in the Browser > Edit
Creating Assemblies
• Occurrence
– Grounded Component
• The Component will not move
– All Degrees Of Freedom are removed
– When constraining, components move to a Grounded
or constrained component
• Any number of components can be grounded
Assembly Constraints
• Constraints
– Create relationships between components
• Bolt and a Hole
• Reduce the number of Degrees Of Freedom
– 6 total (3-translational & 3-rotational)
– View > Degrees of Freedom
– Component Properties > Occurrence tab
Assembly Constraints
• Constraints
– Placing Constraints
• Constraint tool
– Right-click > Constraint
– ‘C’ hot key
• Place Constraint Dialog
Assembly Constraints
• Constraints
–Constraint Types – Assembly tab
• Mate
– Plane, Line, or Point
» Assembles two components so that the surface normal on
the selected planes are opposite each other
» Assembles the edges of lines
» Assembles two points together
• Flush Solution
– Aligns two components so the selected planes face the same
direction (surface normal point in the same direction)
Assembly Constraints
• Constraints
– Constraint Types – Assembly tab
• Angle
– Specify the degrees between the selected planes or
use an Explicit Reference Vector
Assembly Constraints
• Constraints
– Constraint Types – Assembly tab
• Tangent
– Defines a tangent relationship between planes, cylinders,
spheres, cones, and ruled splines
– At least one selected face must be a curve
– Inside/Outside Solutions
Assembly Constraints
• Constraints
– Constraint Types – Assembly tab
• Insert
– Two circular edges
– Centerlines are aligned & mate constraint is applied to
the planes defined by the circular edges.
– 5 DOF are removed with an insert constraint
Assembly Constraints
• Constraints
–Constraint Types – Motion tab
• Animation the motion of gears pulleys, rack and pinions, etc.
– You can drive one component and cause others to move accordingly
• Motion constraints are secondary constraints
– They do not maintain positional relationships between components
• Recommended: fully constrain components before applying
motion constraints, then suppress the constraints restricting
motion
Assembly Constraints
• Constraints
– Constraint Types – Motion tab
• Rotation
– Define a component that will rotate in relation to another
component
– Specify a ratio for the rotation between the two components
– Forward & Backward solution types
Assembly Constraints
• Constraints
– Constraint Types – Motion tab
• Rotation-Translation
– Define rotation relative to translation of a second component
Assembly Constraints
• Constraints
– Constraint Types – Transitional tab
• Transitional
– Specifies a transitional relationship between a cylindrical
part face and a contiguous set of faces on another part
Assembly Constraints
• Constraints
– ALT – drag a part to another part
• No Place Constraint dialog box
• Select correct area on the part to apply the constraint
M or 1
Changes to a mate constraint. Spacebar flips to a flush solution.
A or 2
Changes to an angle constraint. Spacebar flips angle direction.
T or 3
Changes to a tangent constraint. Spacebar flips between inside/outside
solutions.
I or 4
Changes to an insert constraint. Spacebar flips insert direction.
R or 5
Changes to a rotation motion constraint. Spacebar flips the rotation
direction.
S or 6
Changes to a rotation-translation constraint. Spacebar flips the
translation direction
X or 8
Changes to a transitional constraint.
Assembly Constraints
• Moving & Rotating Components
– Move Component Tool
• Drag individual components in any linear direction in
the viewing plane
• Temporarily suppresses assembly constraints on the
component until the assembly is updated
(constraints are then re-applied)
– Rotate Component Tool
• After selected, the 3D rotate symbol appears on the
selected component
• Similar to the Move Component tool, Rotate
Component temporarily suppresses any assembly
constraints applied to the component
Assembly Constraints
• Editing
– Two Methods via the Browser
• Double-click the constraint name
• Right-click the constraint name
and select Edit, Suppress, or
Delete
– Edit - opens the Edit Constraint
dialog box
– Suppress – the assy constraint
is not applied
– Delete – deletes the assy
constraint
Assembly Constraints
•Conflicts
–Alert Box
• If you try to place or edit an assembly constraint and it
cannot be applied, an alert box is displayed explaining
the problem.
–Conflicting
• When assembly constraint conflicts with another one,
a small yellow icon with an exclamation point is
displayed in the Browser
–Recover
• Displays the Design Doctor
to walk you through the
steps to fix the problem
Browser Views
• Assembly View
– Assembly constraint symbols nested below both
constrained components
• Modeling View
– Assembly constraints are located in a
Constraints folder
Find Other Half
• Find component that constrained is
applied to
Isolating Constraint Errors
• Design Doctor
– Isolate and Edit Constraint
– Turn off all components except those that
participate in the common constraint
Exercise 6-1
• Assembling Parts
Designing Parts In-Place
• In-Place Creation
– Initial Sketch Creation
• Face of an existing assembly component
• Work Plane
– Automatically constrain the sketch plane to the
selected face or work plane
• Creates a Flush
constraint between
the sketch and the
selected face or plane
Designing Parts In-Place
• In-Place Creation
– After the base feature is created
• Create additional features based on geometry from
another part in the assembly an adaptive work plane
is created.
• The adaptive work plane moves as necessary to
reflect changes in the component that it is based upon
– The sketch moves with the plane
– Features based on the sketch adapt to match its new position
Exercise 6-2
• Designing Parts in the Assembly Context
Assembly Browser
• Tools
– In-Place Activation
• Double-click a subassembly or component
occurrence in the Browser to activate it
• Right-click > Edit
• All components that are not active are shaded in
the Browser
The Assembly Return Tool
• Return to subassembly
• Return to top level assembly
Assembly Browser
• Tools
– Visibility Control
• Expand the Browser until the desired component
occurrence is visible
• Right-click > Visibility
Adaptivity
• Definition
–Allows the size of a part to be determined by setting up a
relationship between the part and another part in the
assembly
• Under-constrained sketches and features can adapt
• The adaptivity relationship is acquired by applying constraints
between an adaptive sketch or feature and another part
– The sketch cannot be fully constrained
– A part can only be adaptive in one assembly at a time
– Only one occurrence of a part can be adaptive – other occurrences
reflect the size of the adaptive part
–Example
• Diameter of a pin from the size of a hole or vice-versa
Adaptivity
• Options
– Tools > Application Options > Assembly tab
Adaptivity
• Example
– The rectangular sketch is not dimensioned
along its length
Adaptivity
• Example
– The extruded feature is defined as adaptive
Adaptivity
• Example
– Parts are placed, constraints applied between
the two plates (flush between the faces on the
ends of the plates)
Exercise 6-3
• Creating Adaptive Parts
2D Design Layout
•
•
•
•
Function before form
Create a new part
Sketch 2D geometry
Add assembly constraints
Enabled Components
• Enabled
– Component is displayed as wire frame and
cannot be selected in the graphics window
– Right-click a component and select Enabled
from the menu
PATTERN COMPONENTS
• Pattern Components
–
–
–
–
–
–
Rectangular
Circular
Based on Feature Pattern
Suppress Elements
Pattern Assemblies
Replace Components
Exercise 6-4
• Patterning Components
Minimum Distance Tool
• In an assembly measure distances between
– Components
– Parts
– Faces and Edges
Analysis Tools
• Center of Gravity
– View > Center of Gravity
• Displays Gray when the properties are out of date
• Hover the cursor over the origin of the symbol to
display the COG coordinates
• Measure to
Analysis Tools
• Interference Checking
– Tools > Analyze Interference
• Define Set #1 – select components that define set 1
• Define Set #2 – select components that define set 2
Exercise 6-5
• Analyzing an Assembly
Driving Constraints
• Drive Constraint tool
– Simulate motion
• Right-click on a constraint in the Browser >
Drive Constraint
Driving Constraints
• Drive Constraint tool
– Assembly Constraints
– Record
– Drive Adaptivity
– Collision Detection
Exercise 6-6
• Driving Constraints
Presentation Files
• .IPN Extension
– Exploded Views
– Hide specific components
– Create animations of assembly and disassembly
of components
– Work Plane
• Associated with the assembly file
– Changes made to the assembly are reflected in
the presentation file
Presentation Files
• Panel Bar
– Presentation
Panel
Create View
Creates views of the assembly
Tweak
Moves and/or rotates parts in the view
Components
Precise View Rotates the view by a specified angle direction
Rotation
using a dialog box
Animation
Creates an animation of the assembly – AVI file
can be output
Presentation Files
• Creating Presentation Views
– Create a presentation view
• Create View tool
• Adds a presentation view to the file and the Browser
Presentation Files
• Creating Presentation Views
– Tweaking Components
• Moves or Rotates components a specified
distance or angle
• Auto Explode
– Extends all tweaks the same distance
Presentation Files
• Creating Presentation Views
– Tweaking Components
• Tweak Component Dialog Box
– Manual Tweaks
Presentation Files
• Creating Presentation Views
– Animation
• Animate Tool
– Controls for playback
– Record to AVI or WMV file
Presentation Files
• Creating Presentation
Views
– Animation
• Animate Tool > More
button
– Changing the Animation
Sequence
– Move Up / Down
– Group / Ungroup
Exercise 6-7
• Creating Presentation Views
Creating Drawing Views
(Assemblies & Presentations)
• Base View
– Base View tool
– IAM and IPN files
Creating Drawing Views - BOM
Editor
• Edit item number, quantity, part number,
description, vendor, etc.
• The BOM is also considered associative to
parts and assemblies
EXERCISE 6-8
• Editing the BOM
Creating Drawing Views
(Assemblies & Presentations)
• Balloons
– Balloon tools
• Balloon - Single Components
• Auto balloon – Selected Components
Creating Drawing Views
(Assemblies & Presentations)
• Balloons
– Editing
• Right-click a balloon > Edit Balloon
• Edit Balloon dialog box
– Balloon Type
– Balloon Value
Creating Drawing Views
(Assemblies & Presentations)
• Parts List
– Parts List tool
• Select a view
• Enter options in the Parts List
dialog
• Click OK
Creating Drawing Views
(Assemblies & Presentations)
• Bill of Materials dialog box
• Edit the assembly BOM.
• All changes are saved in the assembly
and corresponding component files
Creating Drawing Views
(Assemblies & Presentations)
• Parts Lists
– Editing
• Right-click and select Edit Parts List
Exercise 6-9
• Creating Assembly Drawings
Applying Your Skills
• Skill Exercise 6-1
Skill Exercise 6-2
Project Exercise – Chapter 6
Creating and Documenting Assemblies
• In Appendix A
Checking Your Skills
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
True_ False_ The only way to create an assembly is by placing
existing parts into it.
True_ False_ Explain top-down and bottom-up assembly
techniques.
True_ False_ An occurrence is a copy of an existing component.
True_ False_ Only one component can be grounded in an
assembly.
True_ False_ Autodesk Inventor does not require components in an
assembly to be fully constrained.
True_ False_ A sketch must be fully constrained to adapt.
True_ False_ What is the purpose of creating a presentation file?
True_ False_ A presentation file is associated with the assembly file
on which it is based.
True_ False_ When creating drawing views from an assembly, you
can create views from multiple presentation views or design views.
True_ False_ A 2D design layout consists of a series of 2D
sketches that are constrained to 3D parts in an assembly file.