Many people are aware of the AutoCAD drawing (v 2.18) of the solar system, circa 1985. The name of the file is solar.dwg and it was included as a sample drawing at one point. You can download the drawing from this Between the Lines post from a couple of years ago.
Why am I bringing this up again now? I just thought is was pretty awesome that you can view this drawing using AutoCAD 360, on a smartphone. At one extreme, you can view the entire solar system including the almost 6 BILLION km orbit of Pluto. At the other extreme, you can zoom all the way down to the ±1/3 inch writing on the plaque on the lunar lander sitting on the moon. See screenshots below. (Note: I changed the colors of the linework to green in the screenshots for visual clarity)
If you have an AutoCAD shape file (.SHX) and you want to make changes to it, you will need the source file (.SHP) from which is was created. If you do not have the source file, there is a way to convert the .SHX to .SHP if you have Express Tools installed with your copy of AutoCAD. Read more about Converting AutoCAD SHX to SHP
I have seen this question a few times in person and on various forums. For at least one version prior to AutoCAD 2011, AutoCAD arcs included directional arrow grips on the ends that performed as Lengthen grips.
AutoCAD 2011 introduced multifunctional grips that allow for (you guessed it) multiple functions, and the arrows disappeared.
If you want to restore the arrow grips, you can set GRIPMULTIFUNCTIONAL to 0
If you work with scanned images in AutoCAD, have you ever wanted to perform OCR from right inside of AutoCAD? Raster Design includes this ability, and Raster Design is now included in many of the suites. Read more about OCR in AutoCAD
Here, we are going to add a custom paper size in AutoCAD. If you print to a Windows system printer, you can add the paper size to the system printer. In this tutorial, we are adding a custom paper size to a PC3 file, and in this particular case the built in printer DWF6 ePlot.pc3.
This is a new empty drawing and the default size for our layout is 8-1/2"x11" (dimensions were added manually to illustrate the paper size).
When making entity selections in AutoCAD, sometimes the results can be unexpected. You may select a hatch object and move it its associative boundary stays put, or you may erase a line and other geometry disappears with it. Situations like this can be controlled by a system varible named PICKSTYLE.
I have been recently running across AutoCAD DWG files that contain hundreds of non-purgable linetypes, some with strange names, some that appear to be nested in mysterious blocks, etc. With help from the Autodesk Forums and some independent research, I became pretty sure these were created by importing Microstation DGN files.
Does your AutoCAD recent file list work for you, or does it fill up with seemingly random .DST (sheet set) files instead of the last .DWG files that you worked on? The latter is documented all over the Autodesk forums, here is one such thread, dated back to 2008 (yes, it has been an issue for that long). In another thread, Jeff Mishler from Quux Software has provided a standalone application (at no cost) to help you manage your recent documents list.