K-Factor

If your flat pattern dimensions are wrong, the K-factor is usually why. But “set the K-factor” is the third step in a process that starts with understanding what K-factor is, what bend deduction is (they are different things expressed in different units), and — critically — knowing which of three separate places in SOLIDWORKS is actually controlling your flat pattern. K-Factor and Bend Deduction Are Not the Same Thing Both K-factor and bend deduction describe what happens to material during bending, but they describe it differently. ...

A fabricator opens your STEP file. They run Insert Bends. SolidWorks creates a flat pattern. The dimensions are wrong. Not slightly wrong — off by several millimetres on every bend. Enough to cause rework. Enough to get a call from the shop floor. The reason is that STEP files don’t carry k-factor data. They never did. Understanding why, and what to do about it, is the difference between a clean handoff and a rebuild. ...

At some point, someone in your shop opens a SolidWorks part and gets this: Microsoft Excel is required for gauge tables. Please ensure Excel is installed and try again. The popup appears when the Sheet Metal feature dialog tries to open the gauge table file via OLE automation. If Excel is not present — or if it has been uninstalled after the company moved to Google Workspace or LibreOffice — the gauge table feature silently stops working. ...

The flat pattern comes out wrong. The folded part measures correctly. The DXF dimensions are off by a few millimeters — or sometimes more. Your press brake operator is asking questions you can’t easily answer. This is a K-factor problem, and it’s common enough that manufacturing shops build their own macros to detect it. Understanding why it happens, and how to set SolidWorks up to avoid it, is worth the time for any team doing regular sheet metal work. ...