B A S I C L A Y O U T C O N C E P T : C R E O P A R A M E T R I C 3.0
Layout in Creo is flexible and easy to use. Layout utilizes a new 2D drafting engine that is shared with Creo Direct. Layout is not fully-constrained like Sketcher, but does utilize intelligent 2D design tools that provide guides for snapping geometry together. Layout also recognizes geometry relationships such as horizontal/vertical, equal length, or equal diameter. Layout is not a detailed application, but can contain basic annotations such as notes, tables, and editable dimensions that update geometry.
In Layout, we can also import images, 2D geometry or cross-sections from 3D models into Creo Layout to aid in design, or use Layout to bridge the gap between 2D design and 3D design and accelerate the design process.
L A Y O U T T Y P E S & U S E S
Creo Layout creates *,cem files, whereas Notebook in Pro/Engineer creates *.lay extension. By default, Layout generates a file called cem0001.cem and Notebook generates a file called lay0001.lay.
Utilizing Layout Files. Layout *.cem files can be opened for 2D design within Creo Layout, or assembled into a Creo Parametric Assembly (*.asm) as a component, similar to using a Skeleton model. 2D geometry in Creo Layout becomes referenceable (có tính cách liên quan) curve geometry in the 3D assembly that can be used to design 3D models. In this example, a new front housing is being designed in 2D, and in Figure 3 the curve is visible in the 3D assembly.
T H E L A Y O U T W O R K F L O W
The following represents a typical workflow; however, we should utilize the steps that are most pertinent to our design goals.
Import Data Into Layout. Unless we are creating a 'clean sheet' design, most designs start with the reuse of geometry or other information. Layout enables us to collect all of our information in one location for reference. examples of imported data include:
Create Geometry: In this step, we can —» Modify or manipulate imported or existing 2D geometry • Copy or reuse existing geometry • Create new geometry • Develop design alternatives. In this Creo' example, several seat and wheel alternative were created, and a current model was decided upon.
Oranize and Annotate Geometry. Layout provides several tools to organize geometry for display and selection, including —» Geometry colors and line styles • Groups • Tree structure • Tags • Properties. We can also create notes, tables, and dimensions to annotate our design. The tasks in this step of the process may be intertwined (được chắp vào) with tasks from the Create Geometry step.
Leverage Geometry In a 3D Model. Once the 2D design is complete, we may want to leverage geometry (tác dụng của hình học) in 3D. We can select which geometry to share and then leverage it in a 3D assembly. As a result, the 2D geometry becomes 3D curves (project curve, composite curve, helix and spiral, split line, curve through reference points, curve through XYZ points) which we can reference when creating 3D geometry. In this Creo' model, design could be imported into a 3D model as curves for reference.
T H E L A Y O U T I N T E R F A C E & S E L E C T I N G G E O M E T R Y
There are many different areas of the Creo Parametric user interface that we utilize when creating models. The areas that display depend upon the function we are currently performing. Areas of the main interface include:
Selecting Geometry. Select layout entities using different selection methods. Selection methods includes:
C R E A T E A L A Y O U T
Creating New Layout Files: It is important to achieve a balance between using standard company information while maintaining an unconstrained layout design. A layout does not have to have defined borders. This enables greater potential (khả năng) for creativity and design variations. A layout is not a production drawing. A layout intentionally does not have to contain drawing standards or control.
Options for New Layout Files: Options can be edited —» Units (The units specified do not affect the layout unless you import 3-D models.) • Background color • Text size.
Creating a Layout: New —» Type = Layout —» New Layout = Use template (Uses an existing layout *.cem file as a starting point for the new layout. This option is similar to using a start part for Part mode and Assembly mode in Creo Parametric. Using a template when creating a new layout retains consistency within your organization.) • Empty with format (Applies a standard Creo *.frm drawing format over the new layout. Use a format when you need title block information in the layout. A format can be applied over a layout template.) • Empty (Creates a new layout with no geometry).
L A Y O U T S K E T C H I N G M E T H O D O L O G Y
How to use the precision panels and guides to precisely control the geometry, and how to apply sketching settings and to use dimensions and constraints to build design intent into sketches.
Sketching Using Precision Panels. Its enables us to type one or two values, depending on the situation or type of entity we are sketching. The blue shaded value is the active value. Press the UP and DOWN ARROWS on your keyboard to toggle between values in the precision panel. Typing a value enters it into the blue, or active, section of the precision panel. Pressing ENTER accepts the current values in the panel and places the entity based on those values.
The precision panel provides various value types for which to specify values. Press SPACEBAR to toggle through the various value types • X and Y values • ∆X and ∆Y values • Length and Angle values • Width and Height values • Radius values • Diameter values.
Sketching Using Touch and Untouch: Touch —» Cursor over a layout item, pause, and then cursor away. The result is that the layout item can be referenced when sketching new geometry, and small circles display on the touched entity. Untouch —» Cursor over a layout item, pause, and then cursor away. The result is that the layout item can no longer be referenced when sketching new geometry, and the small circles disappear from the untouched entity. Touch enables the following...
Controlling Guides: Touch can be repeated up to four entites at once. Compound guides display from the multiples entities as show in Fig. a. To untouch all guides at once, right -click and select Clear Temporary Guides. Further control guides using the following operations...
To create a guide that is able to be permanently referenced, select the entity, right-click, and select Add To —» Permanent Guide Reference. This results in the following...The guide is displayed as a bold circle • The guide is maintained when the layout is saved • The guide is unaffected by the Clear Temporary Guides operation • Or disable the guide from being permanent by selecting the permanent guide, then right-clicking and selecting Remove From —» Permanent Guide Reference.
Controlling Precision Panel Display: Control the display of the precision panels using the following methods...
Controlling the Display Grid: View tab —» Origin (to set the grod origin) or Grid (display or hide) or Snap to Grid —» click downward arrow in Grid tab —» Grid Settings —» Type = Cartesian or Polar —» Gid Spacing = Dynamic or Static —» Angle (specify the angle between grid lines).
Graphic Toolbar Setting: More icons can be added to the In Graphics toolbar by right-clicking the In Graphics toolbar and selecting check boxes for the icons to display.
Utilizing Layout Dimensions. Dimensions are both driven and driving, which means that if we edit a dimension value, the geometry updates, or if we drag the geometry, the dimensions update. Layout geometry updates according to the “grow direction” of the dimensions, which is controlled by the lock and unlock icons on the dimension. Right-click the green and red handles to unlock or lock them, respectively. The grow direction is left to right, meaning that the left vertex is locked, and changes to the geometry are made left to right or vice versa.
Creating dimensions: Select geometry first, or start the dimension command first. Select the Annotate tab in the ribbon and click Dimension , or right-click and select Dimension. Either select a single piece of geometry and dimension it according to the geometry type, or select two pieces by pressing CTRL and place a dimension between them, such as —» Distance from point to point • Angle between lines • Distance between entities —» Locate the dimension as desired, and then middle-click to place it.
Manipulating Dimensions: In Layout, dimension can be manipulate by —» Dragging it —» Using the grow direction handles —» Right-clicking (Quadrant for Angle and Rad or Dia options) —» Text Adding/Editing/Sizing —» Dimesion override —» Decimal places (select Properties).
Utilizing Layout Constraints: Create constraints on existing layout geometry to provide desired geometry behavior when dragging or modifying dimensions. Constraints include Horizontal/Vertical • Tangent • Alignment • Parallel/Perpendicular • Equal Length/Radius. To constraint geometry —» move cursor over feature —» right-click —» select Constraints.
S K E T C H I N G L A Y O U T G E O M E T R Y
Sketching geometry is a fundamental, consistently performed operation in Layout. In this section , we'll sketch various geometry entities, as well as sketch construction geometry, and create various datum geometry, including datum axes, datum coordinate systems, and datum points.
Sketching Lines: There are three main types of lines sketch in Layout • Line/Arc Chain • Single • Tangent.
Sketching Arcs: There are five types of arcs sketching available in Layout • 3 Point/Tangent End • Tangent • Center and Ends • Conic • Concentric.
Sketching Rectangles and Parallelograms: Remember the following when sketching rectangles and parallelograms. • The four lines are independent once created • Each individual line can be delete, trim, and align • Center rectangle creates systemetric rectangles.
Sketching Circles: Using the Precision Panel to specify values that define the three locations.
Sketching fillets: Use fillet to round sharp corners. Fillet can be created by selecting any two non-parallel entities. Fillet can be applied to either concave or convex corners, the corners do not have to be 90°. There are two types of fillets available – The Circular option creates a rounded intersection between two selected entities – The Elliptical option creates an elliptical intersection between two selected entities, which are tangent at both ends.