As such, there are no units in AutoCAD, there are conventional units and each user himself implies the necessary dimension of these conventional units (mm, cm, m, inch, foot) when creating objects in the AutoCAD document.
However, you might want to insert objects from one document into another document, and document users created objects in them in different unit conventions (for example, one in millimeters of the other in inches). For the correct result when inserting objects from such documents it is necessary to perform scaling. The scale value depends on the physical meaning of the conventional unit of measurement, and it is set in the Format menu item Units.
In the insert Scale drop-down list, select the units in which objects are created in the current document.
The user can himself at any time pre-scale objects to the required units using the SCALE command (_scale). The magnitude of the scale depends on what units of measurement in which you want to convert. For example, to convert from millimeters to inches, the scale factor would be 0.03937.
You can also use the-DWGUNITS command to adjust the units and scale to the selected units.
When working on drawings in AutoCAD, it is sometimes necessary to transfer these drawings in raster format (for example, jpg). Consider the option of how to do it.
Let’s say we have a drawing in Model space that needs to be translated into JPG format. To do this, select Print from the File menu.
In the window that appears, in the Printer/plotter group Name drop-down list, select the desired file format in which to «print» in this case JPG (or PDF, PNG, etc.). Next, in the Format drop-down list, select the resolution of the image that most clearly displays the contents of the drawing (depending on the size of the drawing).
Next on the list of What to print, select the Frame and select the dimensions of the drawing to be translated to JPG or print. After clicking OK, the program prompts you to specify the location and name of the file to be created. If you have questions you can ask in the comments.
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.
When working with text using the MIRROR REFLECTION command, there is a useful MIRRTEXT command. Using the MIRRTEXT command, you can specify how the text will be «mirrored» relative to the specified symmetry axis. If the value of the MIRRTEXT = 0 command is the result of the MIRROR REFLECTION of the text, it will be as follows:
If the value of the MIRRTEXT command is 1, the result of the MIRROR REFLECT of the text is as follows:
Frequently asked question when working in AutoCAD is the dialog boxes that suddenly cease to appear when calling commands, for example when saving a drawing or opening a new drawing, while a request for a drawing name is issued via the command line.
For the appearance of dialog boxes in AutoCAD, the FILEDIA variable responds. If its value is 1, then when calling commands that have dialog windows, they will appear, if the value is 0, then all user interaction will occur via the command line. to change the value, enter FILEDIA on the command line and set the desired value.
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
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.
To calculate the mass, volume, center of mass of a volumetric body in AutoCAD, there is a corresponding command button to call it is on the Details panel.
Also call the command with its command-line MASS-HAR or _MASSPROP and press Enter.
After you run the command, you must select a volumetric body, then a window with the characteristics of the 3D body will appear.
The first line is called Mass, but in fact it is the Volume of the selected body in mm3.
To obtain body weight, it is necessary to make some calculations, namely, multiply the value In the mass or Volume column by the density of the materials that corresponds to this solid.
To simplify and speed up this procedure, it is easier to use the appropriate application for calculating the mass of 3D body in AutoCAD.
In AutoCAD 2015, the function of pre-selection of objects when you hover the mouse pointer over them, this function is not always and not for all is convenient and useful. For disabling pre-selection of objects meets the variable
SELECTIONPREVIEW. when calling it from the command line and setting the value to 0, the function of preliminary selection of objects will be disabled .
Quite often there is a need to reduce the size of the AutoCAD DWG file, except for the methods already described in the article, we will consider two more. In AutoCAD, there is a command that allows you to delete Unused blocks in the current file, fonts, layers, etc., which also increase the file size. To call this command, select the File menu, then the Utilities item, the Clear command, in the command window click the «Delete All» button.
Blocks can be used to reduce the size of a DWG file with a large 3D assembly containing duplicate objects (_block command in the Russian version). We place one instance of an object or a group of objects in a block, and use the already created block as the remaining instances. when inserting the next block instance into a file, AutoCAD inserts only a link to it, which significantly reduces the file size .