Navigation In Autodesk Inventor - The ViewCube Tool

PLATFORM: AUTODESK INVENTOR PROFESSIONAL 2011/2012

LEVEL OF DIFFICULTY: BEGINNERS

AUTHOR: NDIANABASI UDONKANG

FOLLOW ME ON: Twitter | Facebook

This is a continuation of the series of lessons for new Inventor Users. Check out this blog's table-of-content page for more topics in this series

TOPIC: NAVIGATION IN AUTODESK INVENTOR - THE VIEWCUBE TOOL

BEFORE YOU BEGIN

1. Download the dataset.
2. Save it to a project folder of an existing Inventor project. Set the project active. Learn more about Inventor Projects and Project Files.
3. Open the part file: Menu Browser > Open menu > Open > Navigation_Infant_Scooter_Front_End_Assy.iam

INTRODUCTION

Navigation in Autodesk Inventor embodies those operations carried out in order to view the model from different positions, directions (or orientations) and perspectives. When you navigate around your model, the position and orientation of the model with respect to the user-coordinate system is not altered.
Autodesk Inventor contains very interesting tools that allows you to have complete control of how your model is viewed and positioned in your Graphics Area.
The VIEWCUBE is a user interface tool that is used for changing to preset standard and isometric views of your model, and for orbiting around your model. The preset views are:

1. Six orthographic views
   1. Front,
   2. Top,
   3. Back,
   4. Bottom,
   5. Right, and
   6. Left.
2. Eight Isometric views
   1. SE Isometric,
   2. NE Isometric,
   3. SW Isometric,
   4. NW Isometric, etc.

OBJECTIVES

At the end of this lesson, the reader should be able:

1. Explain the concept of navigation in Autodesk Inventor.
2. Explain the functions of the ViewCube tool.
3. Use the ViewCube for changing the preset views of the model.
4. Use the ViewCube for orbiting around the model.
5. Use the ViewCube settings for controlling the behaviours of the ViewCube.
6. Set the view of the model to either perspective or orthographic view.
7. Properly set various options on the ViewCube Options dialog box.

LOCATING THE VIEWCUBE

The ViewCube is, by default, located at the upper-right corner of the Graphic Area - just above the Navigation Bar and below the Document Window Control Buttons. Refer to Figure 1.

PARTS OF THE VIEWCUBE

The ViewCube consists of the following:

1. Clickable faces,
2. Clickable corners,
3. Home View icon,
4. Compass (not activate by default), and
5. ViewCube menu drop-down arrow.

Figure 2 shows all the parts of a ViewCube with no compass. While Figure 3 shows the ViewCube with a compass.


FACES: The faces and corners are hotspots on the Viewcube (i.e. they are clickable). Each face is labelled with its preset standard view. Click on any face changing the view of your model to the preset standard view indicated on that face of the ViewCube.
CORNERS: Clicking on any corner of the ViewCube, allows you to change the view of your model to any of the eight preset isometric views.
HOME VIEW CUBE: The Home View Cube changes your view to the default or home view of your model. By default, the Home View is the SE (south East) Isometric view. The Home View can be set to any other view at any time.
COMPASS: The compass is any interest addition to the ViewCube. It allows you to perform constrained orbit operation when it is clicked and dragged around.

CHANGING PRESET VIEWS THROUGH THE VIEWCUBE

You can change to any of the standard or isometric views through the ViewCube by simply clicking on the faces or corners of the ViewCube.
Let's do the following exercise:

1. Make sure that the assembly provided in the dataset is opened in Autodesk Inventor.
2. Go to the ViewCube, and click the Home View icon.
3. On the ViewCube, click the Right face. This activates the Right view.
   When a standard view is activated, four triangular markers are shown beside the four sides of the active ViewCube face.Two oppositely-directed curved arrows are also shown at the upper-right area of the ViewCube. Refer to Figure 4.
4. Click the right triangular marker. This rotates the ViewCube to reveal the Top view.
   
   
   
5. Click the bottom marker on the ViewCube. This changes the view to the Back view.
6. Click the counter-clockwise arrow at the upper-right area of the ViewCube. This rotates the ViewCube counter clockwise.
7. On the ViewCube, click the Home View icon.

ORBITING WITH THE VIEWCUBE

The ViewCube can be used for orbiting around the model. Go to this lesson to learn more about the ORIBT tool in Autodesk Inventor.
Let's do the following exercise:

1. On the ViewCube, click the Home View icon.
2. Position the mouse pointer over the ViewCube, click and hold the left button, then drag the mouse around. This technique activates the ORBIT tool, implicitly.

THE VIEWCUBE MENU

The ViewCube Menu contains so many functionalities that makes the ViewCube even more interesting.
You can access the Viewcube Menu by right-click on the ViewCube or by clicking on the ViewCube Menu drop-down arrow as shown in Figure 2.
The following can be found on the ViewCube Menu [1]:

ViewCube Menu

Go Home	The default view of the model. You can change the default view using Set current view as home. You can navigate to the Home position by selecting this option from the context menu or by clicking the Home icon displayed just above the ViewCube.
Orthographic	A display mode where all points of a model are projected along parallel lines to the screen.
Perspective	A display mode where a model is displayed in three-point perspective, very similar to the way objects in the real world are perceived by the human eye.
Perspective with Ortho Faces	A display mode where the model is displayed in orthographic projection when one of the faces of the ViewCube is active.
Lock to current selection	The center and distance does not change regardless of whether objects are selected or deselected.
Set current view as Home	Defines the current view as the default view: Fixed Distance: Sets a Home view that defines both the direction of the view and the extent of the model that fills the view. Fit to View: Sets a Home view that defines the direction of the view, with the extent always ‘view all’. The initial Home view of Legacy documents is set to Fit to View.
Set current view as	Uses the current view to redefine: Top view Front view The front view that is defined in the top-level assembly file prevails as the front view when you edit a part in the context of an assembly file. Set the ViewCube orientation relative to the model by aligning the current view to look at the TOP or FRONT of the model, then use Set current view as with the appropriate selection. The ViewCube Bottom view determines the orientation of the model ground plane. Redefining the ViewCube affects the model ground plane, ground shadows, and ground reflections.
Reset Front	Rests the front view to the default setting. NoteThe front view that is defined in the top-level assembly file prevails as the front view when you edit a part in the context of an assembly file. NoteThis is also the orientation assigned to migrated legacy files.
Options	Opens the ViewCube Options dialog box.
Help Topics	Launches the online Help system and displays the topic on the ViewCube.

DIFFERENCE BETWEEN ORTHOGRAPHIC AND PERSPECTIVE PROJECTIONS

In orthographic projections, all points of a model are projected along parallel lines to the screen WHILE in perspective projections, a model is displayed in three-point perspective (i.e parts of the model that is farther away from you diminish toward three points). The following diagrams will help us understand better.

VIEWCUBE OPTIONS

The ViewCube Options dialog box contains settings for altering and adding more functionalities to the ViewCube. Figure 7 shows the ViewCube Options dialog box. This dialog box can be accessed by right clicking on the ViewCube and clicking Options....

ViewCube Options dialog box Settings

Application Options	Overall settings for the Viewcube
Show the ViewCube on window create	When this check box is enabled, the ViewCube is displayed in the Graphics Area, by default, when any window is opened in Autodesk Inventor
All 3D Views	When this radio button is enabled, the ViewCube is displayed in all 3D views.
Display	Set preferences for the display of the ViewCube.
Only in Current View	When this radio button is enabled, the ViewCube is displayed only in the current view.
On Screen Position	Allows you to change the default position of the ViewCube to any of the following: Top Right, Bottom Right, Top Left, or Bottom Left.
ViewCube Size	Allows you to set the ViewCube size to Tiny, Small, Normal, or Large.
Inactive Opacity	Allows you to set the opacity ( opposite of transparency) of the ViewCube when it is not in use. The inactive opacity can be set to 0%, 25%, 50%, 75% or 100%. An inactive opacity of 100% means that the ViewCube will always be shown even when it is inactive. An opacity of 0% means that the ViewCube will be invisible when it is inactive. Whatever the settings may be, the ViewCube visibility is fully restored when the cursor is hovered over it.
When Dragging on the ViewCube	Set preferences for dragging on the ViewCube.
Snap to the closet View	While being dragged, the ViewCube and the scene rotate like an arcball. If Snap to closest view is selected, the viewpoint snaps to one of the fixed views when it is angularly close to one of the fixed views.
When Clicking on the ViewCube	Set preferences for clicking on the ViewCube.
Fit-to-View on view change	If selected, clicking the ViewCube rotates around the center of the scene and zooms out to fit the scene into the viewport. When dragging the ViewCube, the view changes to look at the scene center prior to the drag (but does not zoom) and continues to use that as the pivot point while dragging. If not selected, clicking or dragging the ViewCube rotates around the current pivot point and does not zoom in or out.
Use animated transitions when switching views	An animated transition displays when you click on a section of the ViewCube to help visualize the spatial relationship between the current viewpoint and the selected viewpoint. Note: When navigating about 3D scenes that contain vast amounts of geometry, the application frame rate can drop significantly and make it difficult for the system to smoothly animate a viewpoint transition.
Keep model upright	When clicking on edges, corners, or faces of the ViewCube, the orientation algorithm normally attempts to turn the viewpoint so that upside-down orientations of the scene are avoided.
Default ViewCube Orientation	Set preferences for the default orientation of the ViewCube. When a new part or assembly is created from a template, it inherits the orientation from the base template.
Front View Plane	Sets the model-space plane to which the front plane of the ViewCube should align.
Top View Plane	Sets the model-space plane to which the top plane of the ViewCube should align.
Document Settings	Set preferences for the display of the Compass. By default, the display is off.
Show the Compass below the ViewCube	Sets the preference for the display of the Compass.
Angle of North	Sets the angle between the ViewCube FRONT face and the Compass direction North.

REFERENCES:

1. Autodesk Inventor 2011 Help System

I hope you learnt a lot from this lesson. If you have any questions, please drop a comment, and I will answer ASAP. Thank you.
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How to Share a Sketch in Autodesk Inventor

PLATFORM: AUTODESK INVENTOR PROFESSIONAL 2012

LEVEL OF DIFFICULTY: BEGINNERS

AUTHOR: NDIANABASI UDONKANG

FOLLOW ME ON: Twitter | Facebook

This is a continuation of the series of lessons for new Inventor Users. Check out this blog's table-of-content page for more topics in this series.

TOPIC: HOW TO SHARE A SKETCH IN INVENTOR

INTRODUCTION

For sketched features to be created, Autodesk Inventor require visible sketches. And more often, a sketch could contain geometry and loops that can be reused across many features. After the first sketch feature is created, the sketch is consumed by that feature and must be shared if other features must have access to the sketch. Sharing of sketches in the simplest way of reusing sketches and saving lots of time.

OBJECTIVES

At the end of this lesson, the reader should be able to:

1. Create a simple sketch in Autodesk Inventor,
2. Constrain the sketch with dimensional and geometric constraints,
3. Create an Extrusion feature, and
4. Share an existing sketch.

SHARING A SKETCH IN AUTODESK INVENTOR

CREATING THE SKETCH GEOMETRY

Let's begin this section by drawing a simple sketch with Inventor. Do the following (refer to Figure 1 for the completed sketch):

1. Launch Inventor. When Inventor is open, click CTRL + N, to launch the New File dialog box.
2. Go to the Metric tab of the New File dialog box, and select Standard (mm).ipt template. Click OK to create a new part file.
3. Press C to start the Circle tool. Create a circle of diameter 20mm that is centered on the sketch.
4. Start another circle that is centered on the upper-left side of the first circle (Refer to Figure 2). Draw the circle towards the circumference of the first circle. A tangent constraint is inferred. Click the circumference of the first circle while the glyph is still showing.
5. Repeat step 4 and draw another circle centered at the upper-right side of the first circle. (Refer to Figure 3 for guidance.).
6. Press L to launch the Line tool. Create a horizontal line above the two top circles.
   
   
   
   
   
   

CONSTRAINING THE SKETCH

1. Now, on the Sketch tab > Constrain panel, launch the Coincident Constraint tool.
2. Click the left endpoint of the line and click the left circle.
3. Repeat step 8 for the right circle.
4. On the Sketch tab > Constrain panel, launch the Tangent Constraint tool.
5. Click the line and the left circle.
6. Repeat step 11 for the right circle.
7. On the Sketch tab > Constrain panel, launch the Equal Constraint tool.
8. Click the left and right circles.
9. Press D to launch the Dimension tool. Click the left circle. Apply a dimension of 25 mm.
10. Click the line and the centerpoint of the center circle. Click the 25-mm dimension that was applied to the left circle. Press Enter. A reference dimension is created.
11. The status bar should be displaying "fully constrained."
12. On the Sketch tab > Modify panel, launch the Trim tool. Click the inner segment of the center circle to trim it off. (Refer to Figure 1 for guidance).
13. Press S to exit the sketch environment. Save the file.

CREATING THE EXTRUSION FEATURE

1. At the upper-right corner of the Graphics Area, click the Home icon on the Viewcube.
   
   
   
2. Press E to launch the Extrude tool. The Extrude dialog box is displayed. The sketch has three closed profiles (or loops). So Inventor can not automatically select anyone for you. Select all the three profiles. Note that you can remove a profile by holding down CTRL and reselecting the profile.
3. On the Shape tab > Extents area, type 10mm as the height of extrusion.
4. Click OK to create the Extrusion1 feature (confirm the name from your Model Browser). Sketch1 is now consumed by Extrusion1.

SHARING SKETCH1

1. On the Model Browser, expand the Extrusion1 feature. Sketch1 is seen to be located under Extrusion1.
2. Right click Sketch1. On the shortcut menu, click Share Sketch. (See Figure 5)
3. Sketch1 is shared and is now added as a first-level object on the Model Browser. (See Figure 6).







4. Click the Home icon on the Viewcube. (See Figure 4).
5. On the Navigation bar, launch the Orbit tool. (See Figure 7)
   
   
   
   HOT TIP: You can also execute the Orbit tool by Holding down the Shift key and Press and drag the mouse wheel on a 3-button mouse.
   
   
6. Click and drag the center of the reticle ( See Figure 8) and reorient the model to appear as shown in Figure 9
   
   
   
   
   

CREATING ANOTHER EXTRUSION FEATURE

1. Press E to launch the Extrude tool. Sketch1 has been shared, so we reuse it for creating another sketched feature.
2. Click the central profile, and use 20 mm as the height of extrusion. Click the direction 2 button to flip the direction upwards if it's directed downwards.
   
   
   
3. Click OK to finish the Extrusion2 feature.
4. Right click Sketch1 on the Model Browser, and click Visibility to turn off the visibility of the sketch. Save the file.
5. The model is completed.
   
   
   

This method can be used for creating very complex parts from one sketch. But it's also a good workflow to create the sketches when needed.

I hope you learnt a lot from this lesson. If you have any questions, please drop a comment, and I will answer ASAP. Thank you.

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Understanding Autodesk Inventor User Interface

/**

*PROLOGUE
* I'm beginning a series of lesson tailored for my friends out there who are learning Autodesk Inventor from the scratch. The lessons are going to be arranged in sequence so that the reader can grow in confidence with each lesson.

*I'm assuming that the reader is new to the world of "digital prototyping" or is migrating from a non-Autodesk product. Whatever might be the case, I'm wishing you a happy learning experience.

*I would also encourage the readers to post comments about the articles. Comment about my methodology, content, useful, in fact anything on your mind. You are also free to suggest to me topics to write about. Thank you.

*/

PLATFORM: AUTODESK INVENTOR PROFESSIONAL 2011

LEVEL OF DIFFICULTY: BEGINNERS


AUTHOR: NDIANABASI UDONKANG

FOLLOW ME ON: Twitter | Facebook

TOPIC: UNDERSTANDING THE AUTODESK® INVENTOR USER INTERFACE

Hello! Welcome to the series of lessons tailored for our friends who are seeking for extra materials to enlighten them as they begin their journey into the interesting world of digital prototyping.

In this lesson, we are going to discuss the various parts of the Autodesk Inventor user interface with the aim of knowing their names and understanding what they do. This lesson is suitable beginners and even those experienced CAD guys who want to know the real names of the various components of the user interface.

At the end of the lesson, the reader should be able to:

1. Know the names of the various parts of the Inventor user interface (UI), and
2. Know the functions of the various parts of the Inventor UI,

This lesson is based on the interface of Autodesk Inventor Professional 2011 and is applicable to the interface of Inventor 2010 and Inventor 2012. Autodesk Inventor is a very large application consisting of so many modules or environment. The modules or environment available in your application depend on the type of Autodesk Inventor you installed. We have:

1. AutoCAD Inventor Suite;
2. AutoCAD Inventor Professional Suite;
3. AutoCAD Inventor Routed System Suite;
4. AutoCAD Inventor Simulation Suite; and
5. AutoCAD Inventor Tooling Suite.

[The AutoCAD prefixes signifies that the Suite is bundled with both Inventor and AutoCAD.]

Also the interface might vary based on the current task being performed. Extra tools will be loaded into the application when you are carrying out routed system design, sheet metal design, simulation, or weldment designs.

Before we start, I advise that you download Fig. 1 and Fig. 2 to your local computer for easy reference. Simply right click on an image and select Save Image As.... Let's get started.

AREAS OF THE INVENTOR USER INTERFACE

Let's begin by discussing the various areas of the user interface. Fig. 1 shows the Inventor user interface when a part file is opened (i.e. the model environment). The figure has been divided into areas are numbered. A schematic of the interface is shown in Fig. 2.  The legend shows the names of the various parts.

1. APPLICATION MENU OR MENU BROWSER

The Application Menu or Menu Browser is found at the top left corner of the Inventor user interface. When clicked on, it display a fly-out that with menus and tools for file operations. The fly-out is shown in Fig. 3.

As shown, we have the New, Open, Save, Save As, Export, Manage, Vault Server, Print, and Close menus plus the iProperties tool. Each menu contains tools with related functions, however, they all typical operate your files.  The Menu Browser also stores the a list of recently-opened files so that you can easily reopen a file. At the bottom is the Options button for launching the Application Options dialog box and the Exit Inventor button for closing Inventor.

HOT TIP: Double clicking the Menu Browser icon closes Inventor. Try it out!

2. QUICK ACCESS TOOLBAR

The Quick Access Toolbar (Fig. 4) is strip containing tools that are frequently used during the design process. It is found at the right of the Menu Browser. Tools like New, Open, Save, Undo, Redo, Local Update/ Global Update, Selection Priorities, etc are displayed on the Quick Access Toolbar.

So you can save yourself some sweat by using the Quick Access Toolbar. The downward-pointing arrow at the end of the Quick Access Toolbar can be used to load more tools on the strip.

3. THE TITLE BAR

The Title Bar (Fig. 5) is the by the right of the Quick Access Toolbar.

The Title Bar displays the name of the application being used and, if there is sufficient space, the name of the file currently being used.

4. THE INFO CENTER

The Info Center is found by the right of the Title Bar. The Info Center consists of tools that can be used to obtain information about Autodesk Inventor both locally and over the internet.

The tools available on the Info Center are the search bar, Subscription Center, Communication Center, Favorites, and Help. You can type in keywords into the Search Bar and hit enter on your keyword and Inventor will display topics, from the local help system, related to those keywords. The Subscription Center can be used by users who have subscribed for Inventor to access the online Subscription Advantage. The Communication Center is can inform the user about news, software updates, and blogs about Inventor. The Favorites tool is used to access your favourite or saved topics. When you search for an article with search bar, click the "star" icon by the right of the topics to add them to your Favorites list (See Fig. 7 & Fig. 8). The Help tool is used to open the Autodesk Inventor Help browser.

5. THE APPLICATION WINDOW CONTROL BUTTONS

These buttons are found at the top right corner of the Inventor Window, and are used to minimize, restore down/ maximize or close the application.

6.RIBBON TABS

The Ribbon Tabs (Fig. 10) are the found just below the first row (containing the Quick Access  Toolbar, Title Bar, and Info Center). The Ribbon is the user interface element that replaced toolbars in almost all Autodesk applications. The Ribbon is divided into Tabs, Panels, and Icons. The Ribbons Tabs are collections of Panels. That is each Tab contains a unique set of Panels. For example, when you are in the model environment, you will see, by default, seven tabs: Model, Inspect, Tools, Manage, View, Environments, and Get Started Tabs. When you click a tab, a set of panels is displayed which is different from those of other tabs.

7. RIBBON PANELS

Ribbon Panels are used to group Icons or tools that perform closely-related functions. The Model tab consists of the Sketch, Create, Modify, Work Features, Pattern, Surface, Plastic Part, Harness, and Convert panels. Each of these panels contains tools (represented by Icons) that are closely related e.g. the Sketch panel contains tools for working in 2D and 3D sketch environments while the Create panel contains tools for creating model features.

8. THE RIBBON

The Tabs, Panels, and Icons or tools make up the Ribbon (Fig. 12). The Ribbon is a very nice way of compressing hundreds of Inventor icons (tools) into a small area of the UI thereby freeing valuable real estate for your graphics area. The Ribbon can further be displayed in various modes to free even more space for those who are not satisfied with the present space. When you click on the downward-pointing arrow beside the last tab on the Ribbon, you can display the Ribbon in three modes:

1. Minimize to Tabs,
2. Minimize to Panel Titles, and
3. Minimize to Panel Buttons (See Fig. 13).

9. DOCUMENT WINDOW CONTROL BUTTONS

These set of buttons are found at the top right corner of the Graphics Area (12) and just below the Ribbon. They are used to minimize, restore down/ maximize, and close the current file. See Fig. 1 & Fig. 2.

10. NAVIGATION VIEWCUBE

The Viewcube is a UI element that used for changing the views of the model in the Graphics Area (12). The Viewcube is a cube with hotspots at its vertices, edges, and faces. The hotspots are clickable and will pre-highlight when you hover the cursor over them. Clicking on any of the four faces of the Viewcube changes the view to the corresponding Orthographic views: Front, Back, Top, or Bottom. Clicking on the corners, or vertices changes the view to the Isometric views. You can also use the Viewcube perform Orbiting operations by clicking and drag it.

The Viewcube options can be accessed by right clicking the Viewcube. On the shortcut menu are tools for displaying the model in perspective or parallel projection.

11. NAVIGATION BAR

The Navigation Bar (Fig. 16) is found just below the Viewcube. It contains all tools for model navigation: Zoom, Pan, Orbit, SteeringWheel, and the View Face tools.

12.GRAPHICS AREA/ WINDOW

The Graphics Area (See Fig. 1 & 2) is the big space at the middle of the UI. It is the area where your models and drawing sheets are displayed. The appearance of the graphics area be set in the Application Options dialog box.

13. MODEL BROWSER

The Model Browser (Fig. 18) is a critical part of the Autodesk Inventor UI. It usually docked by default by the left of the graphics area. The Model Browser displays the features, components, parts, and other information about your designs. The model browser typical displays the features, components or parts according to the order they created (though they could be rearranged).

The model browser for an assembly file is almost identical to that of a part file but for its top row. At the top of the model browser for a part file, there are two buttons: Browser Filters and Find. The Browser Filters button is used to hide some details like Work Features, UCS, Documents, Notes and Warnings in the Browser. The Find button opens the Find Part Sketches dialog box that helps in locating and modifying sketch elements and features.

The model browser for an assembly file has four buttons: Browser Filters, Design View Representation, Modeling and Assembly Views, and Find. The Design View Representation button can be used for easily switch between user-created design views. The Modeling and Assembly Views button is used to switch between modeling and assembly views. A major difference between the modeling and assembly view is that the modeling view puts all the assembly constraints in a folder.

14. USER COORDINATE SYSTEM (UCS) ICON

The UCS Icon is found at the bottom left corner of the graphics area. The UCS Icon indicated the default directions or orientation of the default work axes (X, Y, and Z axes). The UCS Icon has three axes that are color coded with red, green, and blue. The red, green, and blue axis represents the X, Y, and Z axes respectively.

15. STATUS BAR

The Status Bar is used to display message, tips, or information to the user. It is found at the bottom of the UI. When the user is idle, the status bar displays "Ready" meaning that it is ready to perform any task assigned to it.

16. DOCUMENT SWITCHING TABS

The Document Switching Tabs are found at the bottom of the Graphics Area just behind the Model Browser. They are only displayed when more than one file is opened in Inventor (Fig. 22).

On the Document Switching Tabs are buttons for cascading, tiling, viewing, and switching between multiple windows.

17. CAPACITY METER

The Capacity Meter provides very useful information about the amount of memory used by Inventor. The meter has three indicators: total number of occurrences in the active document, total number of files open in the session, and amount of memory used by the session.

Fig. 23 shows a typical capacity meter from an assembly file. It indicates that total number of occurrences of components in the active assembly is 13, and there are 10 unique files opened in the assembly. The color changes from green to yellow when more than 60% of the memory allotted to Inventor is used, then red once 80% has been used.

So that is all. If you have any questions let me know.