Shift Modifier: Fillet

The FILLET command is a fantastic tool to create rounded corners between two (2) line segments but may be more useful to you than you might think. In this blog post, I will share with you a workflow that speeds up the process extending, trimming, and joining two (2) line segments in one command sequence. This workflow works best on polylines rather than lines and arcs, as polylines will be joined together at the end of the workflow sequence.

Figure 1: Original State

Figure 1 above shows two polyline segments that needs to be extended and trimmed to each other, then joined together. Typically, I see users execute the EXTEND command to extend the segment on the right to the segment on the left. Once extended, the segment on the left is then trimmed to the segment that was extended on the right using the TRIM command. Once all segments have been extended and trimmed, a JOIN command will then be used to bring them all together.

A picture containing shape

Description automatically generated

Figure 2: Shift Not Held

A picture containing shape

Description automatically generated

Figure 3:Shift Held

Instead, next time you encounter this situation, use the FILLET command instead. Once you active the FILLET command, you will be asked to select the first object to be filleted. Select the first segment and you will be asked to select the second segment. Before selecting the second segment, hold the Shift key down on your keyboard then select the second object. This simple act of holding shift while selecting your second selection will default your radius value set in the FILLET command to zero, so you do not even need to worry about what the current radius value is set to. After selecting your second segment with the Shift key held down, you should be left with your segments extended, trimmed, and joined together (if polylines) all in one command sequence.

About the Author

Archie Dodge

Civil Solutions Applications Expert<br><br>Over 12 years of experience in geotechnical engineering design, and land planning design, ranging in projects from dams, gypsum stacks and coal ash piles, to subdivisions, parks, and an airport expansion. Autodesk Certified Professional in Civil 3D and an expert in Autodesk infrastructure software. Trainer and consultant with IMAGINiT Technologies.

Follow on Linkedin More Content by Archie Dodge
Previous Article
Control Modifier: Polyline Selection
Control Modifier: Polyline Selection

Using the Control key to modify how polylines are selected in AutoCAD or Civil 3D

Next Article
Dynamo Scripting:  Import layers from an Excel Spreadsheet into AutoCAD
Dynamo Scripting: Import layers from an Excel Spreadsheet into AutoCAD

Create layers, colors, linetypes and descriptions from an Excel Spreadsheet. Use Dynamo in 3 stages to gen...


Get Tips Delivered.

Subscribe to Email Updates.

First Name
Last Name
Thank you!
Error - something went wrong!