How to Reduce File Size in AutoCAD 2015?

Understanding Large File Sizes in AutoCAD

Managing file size is crucial in AutoCAD to enhance performance and ensure smooth operation, especially as projects progress. Large DWG or DXF files can lead to longer load times and possible data loss. Identifying the root causes of bloated files is the first step toward effective size reduction.

Common Causes of Large File Sizes

1. Corrupted Data: Sometimes, drafts can include corrupt elements that bloat the database.

2. Improperly Mapped Data: When importing data from DGN files, incorrect mapping of linetypes can create large object databases that are difficult to purge.

3. Excessive Xrefs: Numerous external references can substantially increase file size and complexity.

Steps to Reduce File Size in AutoCAD

Method 1: Purging Unnecessary Elements

1. Open your drawing in AutoCAD.
2. Type PURGE in the command line and press Enter.
3. In the Purge dialog, select the objects and styles you wish to remove.
4. Click Purge All to delete unnecessary elements.
5. After purging, use the -PURGE command and select Regapps to remove registered applications.

Method 2: Overkill Command

1. Type OVERKILL in the command line and press Enter.
2. Select all objects in the drawing you want to optimize.
3. Confirm and allow AutoCAD to combine overlapping geometry and eliminate duplicates, which can reduce file size significantly.

Method 3: Detach Unused Xrefs

1. Enter the XREF command in the command line.
2. In the External References palette, review attached files.
3. Select any unnecessary external references and click Detach to remove them from the drawing.

Method 4: Exporting and Re-importing 3D Objects

1. For 3D designs, use the ACISOUT command to export 3D solids to a SAT file.
2. Delete the original 3D solids from your drawing.
3. Use the ACISIN command to import the SAT file back into your AutoCAD drawing.

Method 5: Reducing Complexity in Blocks

1. Identify and simplify complex blocks in your drawing.
2. Type BLOCK into the command line, select the block to modify, and consider exploding the block for easier editing.
3. Remove any unnecessary nested components to streamline the block.

Method 6: Changing Plot Settings for DWF/DXF

1. In the Plotter Configuration Editor, navigate to the Device and Document Settings tab.
2. Under Custom Properties, adjust the raster image resolution to reduce the file size when creating DWF files.
3. Avoid high DPI settings unless necessary for detailed outputs.

Managing File Versions

When saving files, consider saving in a lower version format.

1. Click on the Save As icon in the Quick Access Toolbar.
2. Choose the file type version from the drop-down menu, ideally selecting previous AutoCAD versions to ensure compatibility and reduce size.

Frequently Asked Questions

1. What is considered a large AutoCAD file?
A typical AutoCAD file is usually between 500KB to 1.5MB. Files exceeding 5MB are generally considered large and may lead to performance issues.

2. Can I open AutoCAD files without the software?
Yes, Autodesk offers a free tool called DWG TrueView which allows you to open, view, and plot DWG files without needing AutoCAD installed.

3. How often should I purge my AutoCAD files?
It’s advisable to purge your files regularly, especially after major edits or updates to ensure that remnants of old elements do not clutter your drawing and increase file size unnecessarily.