SELECTION SETS In AutoCad

AutoCAD prompts us to select an object after any editing command.The method we used until now was taking the box on the entity and picking that entity.This requires more time and in order to reduce this time we make use of some methods which are discussed below.

          When an editing command is given ,a box appears which is known as a pickbox.We take this on the entity to be selected and pick that entity.

Command                  :PICKBOX enter(System Variable)

New value for pickbox 🙁 give integer value from 0 to 32767)

This system variable is used to set the size of the pickbox.

          In this method a window is defined by picking the first corner and the diagonal opposite corner.

          Only the entities which lie completely inside the window box are selected while entities ,which lies partially outside or completely outside are neglected.

         The last drawn or constructed entity will be selected.

         In this method a crossing is defined by picking the first corner and the diagonal opposite corner.

        The entities lie partially or completely inside the crossing box are selected.

        If the box is dragged to the left side,it is a crossing and if it is dragged to the right side,it is a window.

        This method will select all the entities in the drawing file.

        In this method we will have to drag a fence line through the entities .The entities that cross the fence line are selected.

       This method works on the same principle of WINDOW but now instead of a 4-sided polygon we can select the entities by defining a polygon of infinite sides.The entities that lie completely inside the polygon are selected while the entities that lie partially inside are neglected.

       This works on the same principle of crossing but now instead of a 4-sided polygon we can select the entities by defining a polygon of infinite sides with the condition that the polygon sides should not intersect each other.The entities that lie partially or completely inside the crossing polygon are selected.

      All objects pre-defined in a group command are selected.

      Selected objects can be added to the selection set by using any of the object selection methods.

      Objects can be removed from the current selection set by using any of the object selection methods.To remove specific objects,hold down the shift key and select the objects.

      This helps us select multiple entities.It specifies multiple point without highlighting the objects.This speeds up the selection process for complex objects.

      Selects the most recent selection set.

      This reverses the effect of previous selection of an entity.

      This  helps us select a single entity.The command ends after the selection of a single entity.

      Increases or decreases the apparent size of objects in the current view.

Command : ZOOM enter

All/Center/Dynamic/Extents/Previous/Scale(X/XP)/Window/<Realtime> : Enter an option specify a zoom window, enter a scale value or press enter to turn on real-time zooming.

      The cursor changes to magnifying glass with plus(+) and minus(-)sign.The current drawing is used to determine the zooming factor.Holding the pick button down at the midpoint of the window,and moving vertically to the top of the window zooms in the drawing. Conversely holding the pick button down at the midpoint of the window and moving vertically to the bottom of the window zooms out the drawing.

     Zooms to display the entire drawing in the current view.Zoom all can not be used transparently because it always regenerates the drawing.

      Zooms to display a window defined by the center point of the screen and a magnification  value or height of the screen. A smaller value for the height increases the magnification and a large value decreases the magnification.

      Zooms to display the generated portion of the drawing with a view box. First click for the selection of the box and object. The zooming view box is then displayed resize it and drag it to the location you want. Press enter to Zoom or press pick button to return to the panning view box.

      Press enter to fill the current view with the window currently enclosed by the view box.The blue rectangle represents the limits of the drawing while the green rectangle represents the previous zoom.

      Zoom to display the drawing extents. Zoom extent can not be used transparently because it always regenerates the drawing.

      Zoom to display previous view. You can restore up to 10 previous views.

      Zooms the display at a specified scale factor. The value entered is relative to the limits of drawing. E.g entering 2 doubles apparent display size of any objects from what it would be if you zoomed to the limits of the drawing.

      Zooms to display an area specified by two opposite corners of a rectangular window.

FILLET:-

Rounds and fillets the objects

Command : FILLET enter

Polyline/Radius/Trim/<Select first object>:

Select an object or enter an option

select second object:

select the second object

* RADIUS

Defines the radius of the fillet arc.

Enter fillet radius<current> : specify a radius or press enter

The value entered become the current radius for subsequent FILLET commands. Changing this value does not affect existing fillet arcs.

*POLYLINE

Inserts fillet arcs at each vertex of a 2D polyline where two line segments meet.

Select 2D polyline : select an object enter

*TRIM

Controls whether AutoCAD trims the selected edges to the fillet arc end-points.

Trim/No trim<current>:Enter an option or press enter

Trim     – Trims the selected edges to the fillet arc endpoints.

No trim – Does not trim the selected edges.

CHAMFER:-

Bevels the edges of objects.

Chamfer bevels the edges of an existing object.

Command : CHAMFER enter

Polyline/Distance/Angle/Trim/Method/<select first line>:select a line

POLYLINE:

Chamfers an entire 2D polyline.

Select 2D polyline:select a polyline

AutoCAD chamfers the intersecting line segments at each vertex of the polyline.Chamfers becthe new segments of the polyline.

DISTANCE:

    Sets the chamfer distances from the selected edge.

Enter first chamfer distance<current>    :specify a distance or press enter

Enter second chamfer distance<current>:specify a distance or press enter

ANGLE:

Sets the chamfer distances using a chamfer distance for the first line and an angle for the second.

Enter chamfer length on the first line<current>:specify a distance or press enter

Enter chamfer angle from the first line<current>:specify a angle or press enter

TRIM:-

   Controls whether AutoCAD trims the selected edges to the chamfer line end-points.

Trim/No Trim<current> : Enter an option or press enter