https://forums.autodesk.com/t5/fusion-design-validate-document/chained-ball-joint/m-p/9548453#M110457 <P>I found the issue - distance between rods of each delta arms should be precisely identical. From both sides - carette and effector. Limiting rotation on planar joint also was a mistake.</P> Fri, 29 May 2020 12:45:00 GMT Anonymous 2020-05-29T12:45:00Z https://forums.autodesk.com/t5/fusion-design-validate-document/chained-ball-joint/m-p/9539028#M110456 <P>Good day!</P><P>&nbsp;</P><P>Have read a lot about ball joint trickiness, but really don't understand what i'm doing wrong right now.</P><P>Trying to simulate (actually&nbsp; - calculate by given rod lenght and horizontal beam width) linear delta robot kinematic and every time stuck on last arm joint which cause solving error.</P><P>File attached, ball joint -&nbsp;Ball91, without this oint effector movement (along planar) looks like okay.</P><P>Much appreciate help, where i am wrong, what i am miss.</P> Mon, 25 May 2020 23:49:56 GMT https://forums.autodesk.com/t5/fusion-design-validate-document/chained-ball-joint/m-p/9539028#M110456 Anonymous 2020-05-25T23:49:56Z https://forums.autodesk.com/t5/fusion-design-validate-document/chained-ball-joint/m-p/9548453#M110457 <P>I found the issue - distance between rods of each delta arms should be precisely identical. From both sides - carette and effector. Limiting rotation on planar joint also was a mistake.</P> Fri, 29 May 2020 12:45:00 GMT https://forums.autodesk.com/t5/fusion-design-validate-document/chained-ball-joint/m-p/9548453#M110457 Anonymous 2020-05-29T12:45:00Z