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How could least square be larger than minimum circumscribed

lovethepirk
I'm running a part on Sunday, main datum is a half external sphere. It measures 5.5mm diam using least squares BF, in tolerance, all is good. All vector pts, lots of them prob 40-50, constructed sphere. I mic it for fun in varying angles and get 5.51mm. Totally acceptable diff being lst sq vs Mic and all the other errors floating around.

So I decide to run it at minimum circumscribed....should be larger than lst sq, no? Welp....i get 5.48mm. How could min cir be less than a lst sq? I'm baffled.
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  • Neil,

    I fixed all those grammer errors...im aware of what all the fits are...ran 5 separate runs both with lst sq and min circ, all slightly twisting the part 1 deg for variance. i know they arent stable but its hard to believe the results were all near identical and there are plenty of pts to use...and its a full 180 deg...at the boarderline of too little but i figured enough.
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  • Neil,

    I fixed all those grammer errors...im aware of what all the fits are...ran 5 separate runs both with lst sq and min circ, all slightly twisting the part 1 deg for variance. i know they arent stable but its hard to believe the results were all near identical and there are plenty of pts to use...and its a full 180 deg...at the boarderline of too little but i figured enough.
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