Does anyone know how to make a circular sheet metal knockout?
You need to use the form tool, you'll have to make your own tool and use that.
The SolidWorks software includes some sample forming tool parts to get you started. They are stored in: <install_dir>\Documents and Settings\All Users\Application Data\SolidWorks\SolidWorks <version>\design library\forming tools. You can add this folder to the Design Library by setting it up in File Locations .
You can insert forming tools only from the Design Library and you can apply them only to sheet metal parts. A sheet metal part has the Sheet-Metal1 feature in the FeatureManager design tree. The part on which you insert the forming tool is called the target part. You can create your own forming tools using many of the same steps you use to create any SolidWorks part.
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