How to create and manage a group of objects in AutoCAD.

A group in AutoCAD is a named and saved set of objects. The user can select and edit both the entire group and its individual objects. Groups are useful for managing multiple graphical objects in a consistent manner. You can create them quickly by assigning them default names.
Groups are useful for linking 3D bodies when you do not want to join them using a Boolean operation.

You can add or exclude items from a group at any time.

To some extent, groups resemble blocks, which also combine objects with a name, but in a slightly different way. For example, groups can be saved for use in future work sessions. The difference is that the user can edit individual objects in a group, whereas when working with blocks, you must first break the block into individual elements. Unlike blocks, groups cannot be used in other drawings.

When creating a group, objects are selected, its name and description are specified.

When you create a group, you specify its name and description.

When you copy a group, the new copy is named Ax by default; the new group is considered unnamed. Unnamed groups are not listed in the object Groups dialog box unless the Include unnamed option is selected.

If you select at least one element of the selected group, all its elements are included in the new group.

An object can belong to more than one group at a time, and a group can belong to other groups. You can Ungroup nested groups to restore the original group configurations.

When you use a drawing as an xref or insert block, named groups within the drawing are not available. However, the user can embed and then dismember an xref or block, after which the groups are made available as unnamed groups.

To create a group, you must type in the command line _GROUP, if you type-GROUP command parameters are displayed.

When group selection is enabled, groups can be moved, copied, rotated, and edited in the same way as individual objects. To edit an individual object in a group, turn off the group selection mode or use the handles on the object.

In some cases, it is useful to control the order in which objects belonging to the same group are selected. For example, a user program that defines toolpaths for numerical control may depend on a number of adjacent objects in a specified order.

Reordering elements can be done in two ways: either change the order of the individual elements (either one or more), or change the order of all elements. The numbering of group objects starts with 0, not 1.

How to quickly change the properties of selected objects to Layer values

In AutoCAD, you can use the layer COMMAND to change the specified properties (color, line type, etc.) of selected objects to Layer values. The values of the by Block parameter for objects can also be changed to Layer values. Objects whose properties are not set to Layer do not display layer property overrides set by the viewport.

To specify which properties are changed to Bylayer values in the team settings ASTROLOY after running the command via command line you have to press the right mouse button and select in the context menu setting.

How to quickly select the desired objects in a drawing or 3D Assembly in AutoCAD

In complex Assembly drawings or 3D assemblies in AutoCAD, it becomes difficult to select the desired objects among many others for editing. To solve this problem, the useful AutoCAD function «Quick select» helps to start it, you must click on the button on the Properties palette.




Next, a window will open in which the conditions are set by which AutoCAD will select the desired objects among the set in the editor.

You can search the entire document or in a pre-selected area of the editor.

To select an object, you must set the object Type to its Property and the value that this property of the selected objects must match. For example, you can select all objects of only a certain color.

You can also add or exclude selected objects from the set.

How to squeeze an arbitrary cross section along a path in AutoCAD

Very often there is a need to build a 3D object of a certain cross-section along a complex path, such as piping, wiring, pipes, hoses of sleeves, etc. Such an object can be constructed using the EXTRUDE use the parameter Trajectory. We build the trajectory necessarily using the command POLYLINE geometry can be any.

We construct a section, which we will squeeze out, necessarily perpendicular to the trajectory, in our case, it is a circle.

Select the command to SQUEEZE. In the command prompt, enter «T» (for the Russian version of AutoCAD) ie squeeze sweep. Receive result.

How to extrude an arbitrary section along the path in AutoCAD

Very often there is a need to build a 3D object of a certain cross-section along a complex path, such as piping, wiring, pipes, hoses of sleeves, etc. Such an object can be constructed using the EXTRUDE using the Trajectory parameter, or by using the SHIFT command on the toolbar Modeling.



First, we build a path necessarily using the POLYLINE command, the geometry can be any.



We construct a section that will be extruded, necessarily perpendicular to the trajectory, in our case it is a circle.



Select the command to EXTRUDE.

At the prompt, enter the command line » T » (for the Russian version of AutoCAD) ie squeeze the trajectory.

Receive result.

How to build a fillet (mate) in AutoCAD

The building of fillets and angle mates in a flat or a 3D object in AutoCAD is done with a team MATE (_fillet). You can run the command by typing at the command prompt or by clicking on the toolbar.

After running the command, options for further actions appear:




Entering a letter:

T — cancel the command,

And it will be possible to select a polyline where you will build a fillet all corners of a given radius,

D — set radius value,

B — set the mode with or without cropping the lines that create the angle to be rounded,

H — you can round multiple corners without interrupting the command.

If the choice of the lines forming the angle, but does not have a common point of intersection to hold down the Shift key, the command will extend these lines to their intersection point.

Calculation of mass of a 3D solid

How to carve a 3D solid in AutoCAD

In AutoCAD, you can cut a 3D solid to produce new 3D bodies in several ways. Consider two ways.
The easiest, use the CUT command (_slice in English version). At the command prompt, type CUT, press Enter, select 3D solid, and then the command prompts you for several options for cutting the solid. You can cut a body by specifying three points (the default) by selecting a flat object, a surface, or one of the coordinate planes (XY, YZ, ZX).



Another way to create another 3D solid completely intersecting the one you want to cut. Next, using the command SUBTRACT (_subtract) cut the desired 3D body by subtracting from it another 3D body.

However, after you use the command REDTEL (_separate), to actually divide the body into several.

Translation (conversion) from pdf to dwg by standard AutoCAD tools

AutoCAD is a very versatile CAD program. In confirmation of this, let’s consider a method by which you can translate relatively simple graphics from pdf to dwg format without the use of special programs. The essence of the method is to insert the so-called «pdf Underlay»into the current AutoCAD document. Open the Insert menu, select PDF Underlay. The pdf file selection window appears, select the file and in the next window select the desired page, the insertion point in the document and the scale if necessary.




If the graphics in the PDF vector after inserting into the AutoCAD document to it can be bound by object binding and» outline » the graphics pdf standard means AutoCAD such as polyline, circle, spline, etc.


Several variables are «in charge» of binding to the substrate graph: DWFOSNAP, PDFOSNAP, DGNOSNAP, their values must be equal to «1» for the binding to work.