topic Re: Region Properties - Rotation Angle from projected Sketch Origin to Principal Axes (degrees): in Inventor Forum https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12589558#M25704 <P>Hi Emanuel,</P> <P>&nbsp;</P> <P>It is calculated based on the sketch coordinate system. The glossy arrows show the principal directions.</P> <P>Many thanks!</P> Thu, 29 Feb 2024 01:30:54 GMT johnsonshiue 2024-02-29T01:30:54Z Region Properties - Rotation Angle from projected Sketch Origin to Principal Axes (degrees): https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12588515#M25703 <P>Why do I get a rotation angle from projected Sketch Origin to Principal Axes: 45 degrees? Is that how it is calculated?</P><P>I would like to get the Area moments of inertia with the part as drawn (with the X axis "pointing North" not 45 degrees).</P><P>I've tried drawing the part differently with no success.</P><P>Thank you!</P><P>&nbsp;</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="emanuelc_0-1709138927473.png" style="width: 600px;"><img src="https://forums.autodesk.com/t5/image/serverpage/image-id/1331428iA0E3833E7D5AB0DD/image-size/medium?v=v2&amp;px=400" role="button" title="emanuelc_0-1709138927473.png" alt="emanuelc_0-1709138927473.png" /></span></P><P>&nbsp;</P> Wed, 28 Feb 2024 16:49:42 GMT https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12588515#M25703 emanuel.c 2024-02-28T16:49:42Z Re: Region Properties - Rotation Angle from projected Sketch Origin to Principal Axes (degrees): https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12589558#M25704 <P>Hi Emanuel,</P> <P>&nbsp;</P> <P>It is calculated based on the sketch coordinate system. The glossy arrows show the principal directions.</P> <P>Many thanks!</P> Thu, 29 Feb 2024 01:30:54 GMT https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12589558#M25704 johnsonshiue 2024-02-29T01:30:54Z Re: Region Properties - Rotation Angle from projected Sketch Origin to Principal Axes (degrees): https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12593659#M25705 <P>Thank you, understood.</P> Fri, 01 Mar 2024 17:39:41 GMT https://forums.autodesk.com/t5/inventor-forum/region-properties-rotation-angle-from-projected-sketch-origin-to/m-p/12593659#M25705 emanuel.c 2024-03-01T17:39:41Z