SOLIDWORKS 2021 Change Mate Alignments on Edit

Article by John Lee, CSWE updated December 11, 2020


SOLIDWORKS 2021 introduces greater automatic control over what happens when flipping a mate alignments would result in errors.

Prior to 2021, there is a checkbox for either prompting for confirmation or not.

Pre-SOLIDWORKS 2021 settings option

Pre-SOLIDWORKS 2021 settings option

In SOLIDWORKS 2021, the Change Mate Alignments on Edit control is replaced by a dropdown:

SOLIDWORKS 2021 settings option

SOLIDWORKS 2021 settings option


The functionality is triggered by right-clicking the mate in the feature tree, and choosing Flip Mate Alignment.  Depending on the setting, the next action is as follows:

  • Always will flip the existing mate and reorient the component accordingly.  This may cause the reaction of SOLIDWORKS reversing the alignment of other components in order to prevent mate errors, but otherwise errors may occur.
  • Prompt will prompt the user what to do.
  • If errors would result from the flip, then Never will flip the alignment setting of the mate and trigger any errors that result, without actually forcing the component to reorient.  This can be useful if the intent is to protect the assembly from “blowing up” right away.  It also gives the user a chance avoid errors by undoing that action.

NOTE that flipping the mate alignment, while editing the mate in the mate property manager, will bypass this new functionality.


Learn more assembly tips in tricks in our SOLIDWORKS Assembly Modeling course, and familiarize with the latest enhancements in our SOLIDWORKS Advanced Update course!

Related Links

Get Certified SOLIDWORKS Services from Javelin

Javelin Experts can help you to:

Find Related Content by TAG:

John Lee, CSWE

John Lee is inherently lazy in that he prefers to work smarter - not harder. A CSWE with fifteen years of experience using SOLIDWORKS and a background in mechanical design, John has used SOLIDWORKS in various industries requiring design for injection molding, sheet metal, weldments and structural steel.