A couple of releases back, AutoCAD introduced Dynamic UCSs. Because dynamic is the opposite of static, what you get is a temporary coordinate system that changes as you move the mouse pointer over different planar faces of a 3D object. Click the Allow/Disallow Dynamic UCS button on the status bar, or press the F6 key to toggle Dynamic UCS on and off.
Difference Between Ucs And Wcs
The UCS command offers ten options to help you define a new UCS. Access the UCS command options from the Coordinates panels on either the View tab or Home tab of the Ribbon.
After you select one of these UCS options from the Ribbon, follow the command prompts at the command line or the Dynamic Input prompt.
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- World: Align the UCS to match the WCS.
- Face: Align the UCS to the face of a 3D solid.
- View: Align the UCS so that the X plane is perpendicular to your current viewing direction.
- 3 Point: Specify a new origin for the UCS, and then the positive direction of the X- and Y-axes. Alternatively, use the multifunction grips on AutoCAD’s UCS icon to create a new UCS by moving and realigning the icon.
For more information on all the UCS command’s options, refer to AutoCAD’s online Help system.
The more UCSs in your drawing, the more you need help managing them. AutoCAD offers a handy-dandy UCS dialog box for doing just that. Open it by clicking the dialog box launcher (the little arrow at the right end of the panel label) on the Coordinates panel of the View tab or Home tab, or simply type UCSMAN and press Enter. The three tabs in the UCS dialog box are
- Named UCSs: Lists world coordinate system and other types of user coordinate systems. Set a UCS current with the Set Current button, or right-click a UCS to rename or delete a named UCS. You can’t rename or delete the World UCS.
- Orthographic UCSs: Lists the six default orthographic coordinate systems (front and back, left and right, top and bottom) relative to the WCS. These UCSs are automatically created by AutoCAD and can’t be deleted or renamed.
- Settings: Controls properties of both the UCS icon and the UCS.
After you define a UCS that you think you might want to use again, you can save it in the UCS dialog box. You do that in the following steps, which you begin by creating a solid box:
- Start a new 3D drawing by selecting code>acad3d.dwt (or
acadiso3d.dwt
for the metric crowd) for the template, and ensure that the 3D Modeling workspace is current. - On the Modeling panel of the Home tab, click Box.AutoCAD prompts you:
Specify first corner or [Center]:
- Type 0,0,0 and then press Enter. AutoCAD anchors the first corner of the box at the origin of the WCS and prompts:
Specify other corner or [Cube/Length]:
- Drag the cursor away from the first corner and click a point to set the length and width of the box. Exact distances don’t matter in this example. AutoCAD prompts you:
Specify height or [2Point]:
- Drag the cursor upward from the second corner and click to set the height of the box. AutoCAD creates the 3D box and exits the command.
Then you define the UCS by following these steps:
- Move the cursor over the UCS icon. The UCS icon shows the orientation of the world coordinate system. As you move the cursor over the icon, it turns a greenish-gold color, indicating that it can be selected.
- Click to select the UCS icon. A square, multifunction grip appears at the origin, and round, multifunction grips appear at the ends of the icon’s legs.
- Move the cursor over each multifunction grip and look at the grip menus. Hovering over one of the round grips at the end of a leg lets you choose between realigning the selected axis and rotating the UCS around one of the unselected axes. Hovering the mouse pointer over the origin grip lets you move the UCS origin to a new location and either keep the current alignment of the X- and Y-axes or realign them. The third grip option, World, restores the WCS. Now you use the UCS icon’s multifunction grips to set a new UCS.
- Click the UCS icon to select it, and then move the cursor over the square, multifunction grip at the origin. The cursor jumps to the origin, and the grip menu appears.
- From the grip menu, choose Move and Align. AutoCAD prompts you:
** MOVE AND ALIGN **Specify origin point or align to face, surface, or mesh:
- Move the cursor to a different corner of the box, and when the UCS icon origin is over the corner, click to set the new origin. If you want, you can drag the round grips on the axes to realign the new UCS.
Finally, you have to save it. Follow these steps:
- On the Coordinates panel of the Home tab, choose UCS, Named UCS. AutoCAD displays the UCS dialog box.
- With the Named UCSs tab current, select Unnamed in the UCSs list. The new, unnamed UCS is the current UCS in the drawing and is listed at the top of the list.
- Right-click Unnamed and choose Rename from the shortcut menu. An in-place editor is displayed that allows you to rename the UCS.
- Type a name for the new UCS and press Enter. The Unnamed UCS is renamed.
- Click OK. The UCS dialog box closes, and the new UCS is saved in the drawing.
To switch back and forth between the two UCSs, simply select the one you want to use from the Coordinates panel:
- Use WCS: On the Coordinates panel of the Home tab, choose UCS, World.
- Use your custom UCS: On the Coordinates panel of the Home tab, click in the Named UCS drop-down list and choose the name of the UCS you just saved.
AutoCAD likes giving you lots of choices. You can also restore a named UCS from the UCS drop-down list at the bottom of the ViewCube. Or you can right-click the UCS icon, choose Named UCS, and then choose the UCS from the menu.
Every point in an AutoCAD drawing file can be identified by its X,Y,Z coordinates. (In most 2D drawings, the Z-coordinate value is 0.0.) This system of coordinates is referred to in AutoCAD as the world coordinate system, or WCS.
Coordinate input
The most direct way to enter points precisely is to type numbers with the keyboard. AutoCAD uses these keyboard coordinate entry formats:
Absolute Cartesian (X,Y) coordinates in the form X,Y (for example, 7,4)
Relative X,Y coordinates in the form @X,Y (for example, @3,2): Defines a new point that is X units horizontally and Y units vertically away from the current point.
Relative polar coordinates in the form @distance<angle (for example, @6<45): Defines a new point that is the specified distance units away from the current point at the specified angle from the origin.
User coordinate systems
Many times, you can conveniently define an additional coordinate system to more easily create drawings. This non–world coordinate system, known as a user coordinate system, is so widely used that UCS now refers to every coordinate system in AutoCAD.
Why would you want to diverge from the standard WCS? Well, the most common reason is that it’s much easier to calculate and enter coordinates if they’re based on the plane you want to work on in 3D.
Suppose that you’re modeling an old-fashioned, wedge-shaped rubber doorstop and you want to add the manufacturer’s logo to the sloping surface of the wedge. It isn’t easy if you stay in the WCS, but AutoCAD lets you set a new UCS based on that sloping surface. After the UCS is made current, you draw in it just as you draw in the WCS.
Although originally intended for 3D work, a UCS can be useful on either two dimensions or three. The WCS assumes that the north direction is straight up, but you may be working on a building layout where one wing is at a 37.8 degree angle to the other. Propresenter 6 unlock code windows.
No problem: Simply create a UCS that’s aligned appropriately. You can look up this process in the online help system, but here’s a quick hint: Click the UCS icon in the lower-left corner of the screen to make “grips” appear at the origin and the ends of the axis indicators. Then drag the icon by its grips to set a new UCS.
Draw by numbers
AutoCAD locates absolute X,Y coordinates with respect to the 0,0 point of the drawing — usually, its lower-left corner. AutoCAD locates relative X,Y coordinates and relative polar coordinates with respect to the previous point you picked or typed.
You will see how AutoCAD uses all three coordinate formats to draw a pair of line segments that start at the absolute coordinates 2,1, and then move to the right 2 units and up 1 unit (@2,1) relative to the first point, and then (relative to that point) move 2 units at an angle of 60 degrees (@2<60).
Note in particular how the first two coordinate pairs use the same numbers (2,1) but the second pair defines a different point because of the leading @ symbol.
You can find out the X,Y location of the crosshairs by moving them around in the drawing area and reading the coordinate values at the left end of the status bar. The X,Y coordinates should change as you move the crosshairs. If the coordinates don’t change, click the drawing coordinates area until you see Coords on in the command line.
If you’re using the full version of AutoCAD, you may have noticed that three numbers are at the left end of the status bar. AutoCAD is showing you the X,Y coordinates of the crosshairs and the current elevation. However, in 2D drafting, the Z value is 0, so you can continue calling them X,Y coordinates.
Although it isn’t apparent at first, AutoCAD has, in fact, four coordinate display modes. Clicking the coordinates readout cycles through these modes:
Off (<Coords off>): The status bar coordinate readout is dimmed, and the coordinate values don’t update until you pick a point.
On, showing X,Y coordinates (<Coords on>): The coordinate readout appears black, and the absolute X,Y coordinates update continuously as you move the crosshairs. If no command is active, clicking the coordinates readout alternates between this mode and <Coords off>.
On, showing polar coordinates (<Coords on>): This mode, which displays distance and angle relative to the last point picked rather than absolute X,Y values, appears if a command is active and AutoCAD is waiting for you to pick a point.
On, showing geographic coordinates (<Coords on>): This mode displays coordinates as latitude and longitude values, but it can be used only after you set the drawing’s geographic location with the GeographicLocation command.
If you start a command such as Line, pick a point, and then click the Coordinates area a few times, the display changes from coordinates Off to live absolute coordinates to live polar coordinates. Displaying live polar coordinates is the most informative mode most of the time.
If you’re working in AutoCAD’s architectural or engineering units, the default unit of entry is inches, not feet. Here are some guidelines for entering numeric values when you work with feet and inches:
To specify feet, you must enter the apostrophe (′) symbol for feet after the number:
6′ is 6 feet.
To separate feet from inches, enter a dash:
6′-6″ is 6 feet, 6 inches.
When you enter coordinates and distances, both the dash and the inch mark are optional:
6′6″ and 6′6 are the same as 6′-6″.
To type a coordinate or distance that contains fractional inches, you must enter a dash — not a space — between the whole number of inches and the fraction:
6′6-1/2 (or 6′-6-1/2) represents 6 feet, 6-1/2 inches.
To enter partial inches, use decimals instead:
6′6.5 is the same as 6′6-1/2″ to AutoCAD, whether you’re working in architectural or engineering units.
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Course details
AutoCAD is a world leader in computer-aided design (CAD), and users around the world use this powerful software to communicate their design intent in many different disciplines. In this course, Shaun Bryant takes you through how to work with AutoCAD to create construction drawings that accurately communicate your design intent. Shaun explains how to use the tools and features within AutoCAD to develop drawings that clearly express the sizes of the objects you want to build. He covers how to develop a title block, set up attributes, set up layers to industry standards, develop plans and elevations, set up viewports, and more.Skills covered in this course
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Course Transcript
- [Shaun] We're staying in the Plans and Elevations.dwg file and I've left it in the same state as it was at the end of the last video where we set our units and our limits to work in our infinite model space. So let's jump back to our infinite model space, we've set the units, we've set the limits that we want to work in in our infinite model space as well. Model space is basically a set of coordinates where X and Y intersect at 0,0, and that is known as the world coordinate system or WCS for short. Now it may be that you don't want your design to start at 0,0 where X and Y intersect, you might want to set a user coordinate system or a UCS. Let me just type UCS on the screen like so and press enter, you'll notice now I can specify the origin of the UCS, I can specify a coordinate in model space where I want my origin to be, and that will then become my 0,0 at that user defined coordinate. So you can see there that as I move around, the X and Y can be placed wherever I want it to go…
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