CAD setting UCS explanation

UCS definition AutoCAD provides a variety of methods to create UCS, the way to call the command: toolbar: "UCS", or directly use other icons to define, as shown in Figure 19 3 is shown. Menu: [Tools] → [New UCS (New UCS)] → Submenu Command Line: ucs→ New

In the command line, call the “ucs” command and select “New” The option to define UCS is as follows: Enter an option [New/Move/orthoGraphic/Prev/Restore/Save/Del/Apply/?/World] : nSpecify origin of new UCS or [ZAxis/3point/OBject/Face/View /X/Y/Z] <0,0,0>: Users can define UCS using different methods through various options, as follows: (1) “origin (origin)”: specify the origin of UCS And keep its current X, Y, and Z axis directions unchanged, thus defining a new UCS. (2) & ldquo; ZAxis (Z axis) & rdquo;: UCS is defined with the specified Z axis positive half axis. The Z-axis positive half-axis is determined by specifying a new origin and any point on the positive half-axis of the Z-axis. (3) “3point (three points)”: Define UCS by the specified three points. The first point specifies the origin of the new UCS, the second point defines the positive direction of the X-axis, and the third point defines the positive direction of the Y-axis. The Z axis is determined by the right hand rule. (4) “Object(object)”: Define a new coordinate system based on the selected 3D object. See Table 19-2 for details. The positive direction of the Z axis of the new UCS is the same as that of the selected object. Table 19-2 Selected Objects and Corresponding UCS

Objects

Method for Determining UCS

Arc (Arc)

The center of the arc is The origin of the UCS, the X axis is the arc endpoint closest to the selection point.

Circle

The center of the circle is the origin of the UCS, and the X axis passes the selection point.

Dimension

The midpoint of the dimension text is the origin of UCS, and the direction of the X axis is parallel to the X axis of the effective UCS when drawing the label.

Line

The closest endpoint to the distance selection point is the origin of the UCS, with the linear direction as the X axis

Point

The specified point is the origin of the UCS

Two-dimensional polyline (Polyline)

The starting point of the polyline is the origin of the UCS, and the X-axis extends along the line segment from the starting point to the next vertex

Table 19-2 Selected objects and corresponding UCS

Object

Method for Determining UCS

2D Fill (Hatch)

The first point of 2D fill is the origin of UCS, new The X axis is a straight line between two starting points

Multiline

The closest element end point of the distance selection point is the origin of the UCS, with the element direction being the X axis

3D Face

The first point is the origin of UCS, the X axis is along the first two points, the positive direction of Y is taken from the first point and the fourth point, and the Z axis is determined by the right hand rule.

Shape, Text ,

Block, Attribute

The insertion point of the object is the origin of the UCS, and the new X axis is defined by the rotation of the object around its extrusion direction to create a new UCS. The rotation angle of the object in the new UCS is zero degrees.

(5) & nbsp;Face (face) & rdquo;: UCS and the selected entity object face positive. To select a face, click inside the border of the face or on the border of the face, and the selected face will be highlighted. The X axis of the UCS will be aligned with the nearest edge found on the first face. (6) & View; View: Create a new coordinate system with the plane perpendicular to the view direction (parallel to the screen) as the XY plane. The UCS origin remains unchanged. (7) “X”: Specify the rotation angle around the X axis to get the new UCS. (8) “Y”: Specify the rotation angle around the Y axis to get the new UCS. (9) “Z”: Specify the rotation angle around the Z axis to get the new UCS. 19.3.2 UCS Settings 1. Use the “ucs” command to set the UCS to use the “ucs” command. The system prompts after calling this command: Enter an option [New/Move/orthoGraphic/Prev /Restore/Save/Del/Apply/?/World] : In addition to the “New” option, the other options work as follows: (1) “Move(mov)”: by panning the origin or modifying the current UCS The Z-axis depth is used to redefine the UCS, but retains its original position in the XY plane. The user can also select the

icon button of the “UCS” toolbar to invoke this option, or select the menu [Tools] → [Move UCS] (2) “orthoGraphic( Orthogonal)”: Specify one of the six orthogonal UCSs provided by AutoCAD. These six orthogonal UCSs are respectively “Top” and “Bottom” and “Front”. (Priority) & rdquo;,  Back (back view) & rdquo;, & ldquo; Left (left) & rdquo; and “ Right (right view) & rdquo;. The user can also select the submenu in the menu [Tools] → [Orthographic UCS] to make the corresponding settings. (3) “Prev (previous)”: Restore the previous UCS. AutoCAD saves the last coordinate system created in paper space and the last 10 coordinate systems created in model space. The user can also select the

icon button of the "UCS" toolbar to invoke this option. (4)  Restore"": Restore the saved UCS to make it the current UCS. (5) “Save“: Save the current UCS by the specified name. (6) “Del (delete) & rdquo;: Delete the specified UCS from the saved coordinate series table. (7) “Apply”: When other viewports have different UCS saved, apply the current UCS settings to the specified viewport or all active viewports. The user can also select the

icon button of the "UCS" toolbar to invoke this option, or select the menu [Tools] → [New UCS] → [Apply] 】item. (8) “?”: Lists the specified UCS names and lists the origin of each coordinate system relative to the current UCS and the X, Y, and Z axes. (9) "World": Set the current UCS to WCS. The user can also select the

icon button of the "UCS" toolbar to invoke this option. Description The drop-down list in the “UCS II” toolbar contains the WCS, the previous UCS, the six orthogonal UCS, and the user-defined UCS. The user can select one of them to achieve the same command as the “ucs” command. Features. 2. Use the “UCS” dialog box to set up the AutoCAD system. The “UCS” dialog box is also provided, and other settings can be made in this dialog box. The command is invoked in the following way: Toolbar: "UCS”→

or "UCS II&"→

Menu: [Tools] → [Named UCS… (Name UCS)] or [Tools] → [Orthographic UCS] → [Preset… (preset)] Command line: After ucsman calls the command, the system pops up the "UCS" dialog box, as shown in Figure 19- 4 is shown.

The "“Named UCSs" and "Orthographic UCSs" tabs in this dialog have the same function as the "ucs” command, so the description is not repeated. . The following describes the “Settings' tab: (1) "UCS Icon settings" <; UBS Icon settings specify the UCS icon settings for the current view. ? “On"": Displays the UCS icon in the current viewport. ? “Display at UCS origin point (displayed at UCS origin)”: Displays the UCS icon at the origin of the current coordinate system in the current viewport. If this option is cleared, or the origin of the coordinate system in the viewport is not visible, the UCS icon will be displayed in the lower left corner of the viewport. • “Apply to all active viewports”: Apply the UCS icon settings to all active viewports in the current drawing. (2)  quo;UCS settings(UCS settings)”: Specifies the UCS settings of the current viewport. • “Save UCS with viewport”: Save the coordinate system settings with the viewport. • “Update view to Plan when UCS is changed”: “Resume the plane view when modifying the coordinate system in the viewport”. When the dialog closes, the plan view and selected UCS settings are restored.