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.
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.
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:
Sometimes in the practice of an engineer there is a need to design a screw-type product whose helical surface has an arbitrary step. Consider the construction of this product. Create a sketch describing the trajectory of the future helical surface, this can be a spline given by the coordinates of points or a graph of any function.
Next we create a second sketch tangent to the first, in which we set the base of the auger in our case it is a pipe with an internal diameter of 30 mm.
Extrude the second sketch, we get the foundation of the future auger. Next, create a 3D sketch. In the 3D sketch editing environment, select the CURVE CURVE PROJECTION command, select the SURFACE PATTERN in the Output option, then select the surface itself, this is the pipe and the curve, this is the first sketch created.
The result of this command is the projection of the curve on the outer surface of the pipe. Create a 2D sketch that will determine the cross section of the screw auger blade. With the help of the SHIFT command, we squeeze out the section along the trajectory of the projected curve and the guide surface of the pipe. Preliminary it is necessary to choose the type of shift «Trajectory and guide surface». We get the result.
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.
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
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.
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.