Differentiate Between Ucs And Wcs In Autocad
Understanding the World and User Coordinate systems in AutoCAD
DView Twist vs UCS - I'm curious to find out what others are using to set the rotation of a drawing in AutoCAD. If you simply twist and plot (sounds like a new dance) then I don't see any difference. Switching between UCS and WCS (or one UCS and another UCS) is simple and easy, as is writing.
The World Coordinate System is based on the Cartesian Coordinate System. Having an understanding of this coordinate system (which many people have, despite of probably never heard of the name) is essential to understanding how the WCS (and UCS) work within AutoCAD. Some of what is written below (quotes) I have taken from the AutoCAD 2010 Users Guide.
There are two coordinate systems: a fixed system called the world coordinate system (WCS) and a movable system called the user coordinate system (UCS). By default, these two systems are coincident in a new drawing.
Normally in 2D views, the WCS X axis is horizontal and the Y axis is vertical. The WCS origin is where the X and Y axes intersect (0,0). All objects in a drawing file are defined by their WCS coordinates. However, it is usually more convenient to create and edit objects based on the movable UCS.
By default when you start a new (blank) drawing you use the World Coordinate System (WCS). This is your (0,0,0) point. Looking at the UCS icon, the square in the crosshairs tells you, you are using the World Coordinate System. This is also clear when looking below the compass. In the screenshot below you can see the WCS is active. When clicking on arrow it shows you have the WCS active and gives you the option to create a new User Coordinate System (UCS).
How to work with the User Coordinate System?
Virtually all coordinate entry as well as many other tools and operations reference the current UCS. 2D tools and operations that depend on the location and orientation of the UCS include the following:
- Absolute and relative coordinate entry
- Absolute reference angles
- Definition of horizontal and vertical for Ortho mode, polar tracking, object snap tracking, grid display, and grid snap
- Orientation of horizontal and vertical dimensions
- Orientation of text objects
- View rotation using the PLAN command
Moving or rotating the UCS can make it easier to work on particular areas of a drawing.
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You can relocate the user coordinate system with methods such as the following:
- Move the UCS by defining a new origin point.
- Align the UCS with an existing object.
- Rotate the UCS by specifying a new origin point and a point on the new X axis.
- Rotate the current UCS a specified angle around the Z axis.
- Revert to the previous UCS.
- Restore the UCS to be coincident with the WCS.
Each of these methods have a corresponding option in the UCS command. Once you have defined a UCS, you can name it and then restore it when you need to use it again.
For instance: If you want to set a drawing to a newly determined zero-point, so you can use that particular point as the starting point for a coordinate system you need to use, you can just move the UCS to that new point. That point will then be the (0,0,0) point. You can even change the UCS angle if that is required. You can name them and save them, so you can switch between them. In Paperspace you need to keep in mind that the UCS only has a (0,0) point: An ‘X’ and a ‘Y’ coordinate.
When moving the UCS origin (see pictures below) you can see the square in the crosshairs is gone, meaning you use the User Coordinate System. Instead of seeing WCS underneath your compass you now see ‘Unnamed’, meaning your active UCS is still unnamed.
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Differentiate Between Ucs And Wcs In Autocad
To save your newly determined UCS do the following:
- Click View tab>UCS panel>Named UCS. The new UCS is displayed in the UCS list as UNNAMED.
- In the UCS dialog box, Named UCSs tab, select UNNAMED and enter a new name. (You can also select UNNAMED, and right-click. Click Rename.)
- Click OK. You can use up to 255 characters, including letters, digits, and the special characters dollar sign ($), hyphen (-), and underscore (_). All UCS names are converted to uppercase.
When you have determined a new UCS origin, and want to switch back to the World Coordinate System, you need to save you new UCS before you switch. Otherwise the new point UCS point will be lost.
There is much, much more to say about the UCS system, but these things are just the basics. Of course the command to use to manipulate your UCS is:
UCS
This will give you all sorts of options (to move, rotate, name, etc.) for your UCS.