I want to do a 3d best fit alignment using 8 constructed points I manually inputted with no CAD and no existing axis system in place. 4 are nominal values and 4 are actual values previously taken. When I try new alignment and best fit, select the 8 points, 3 Dimensional, Least Squares, weight of 1.000 to all, the result is no rotation or translation. Prior to trying best fit, the largest 3d deviation from a nominal point and it's actual partner is approximately .023". After best fit, I'm hoping to see an almost equal 3d deviation between each nominal and partner. What am I doing wrong? Thanks for any help.
3d best fit alignment problem
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Originally posted by zox20 View PostPrior to trying best fit, the largest 3d deviation from a nominal point and it's actual partner is approximately .023". After best fit, I'm hoping to see an almost equal 3d deviation between each nominal and partner. What am I doing wrong?Last edited by DJAMS; 08-05-2012, 09:49 AM.
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Thanks for the help. I did allow rotation and translation. DJAMs got me thinking. Edit the 4 constructed points of actual values and plug in their nominal values into their theoreticals. Then best fit again only using the 4 edited actual points. Now when I open the alignment to see the values, I have something other than zero. I'll verify the deviation lengths tomorrow at work. Thank you.
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