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Angle between two planes not matching up... ?!

Hi OnShape Community-

This may not be a great question but I can't wrap my head around a problem I'm having with OnShape modeling in the Part Studio.  When I rotate+copy a piece in the part studio by 60°, the angle between the new part and its original is actually 64.20°.  At least that's what it reads when I try to measure the angle between it and its own original.  Why would this be the case?  I thought it was just mismeasuring somehow but the part won't line up - if I have the rotate+copy command rotate the piece by 55-56° the measured angle comes closer to 60°.  I'm clearly missing something simple here but can't figure out what!  Any help is much appreciated.  Thanks!

Rotate:


Why does the angle read at 64.29°?


Answers

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    Narayan_KNarayan_K Member Posts: 379 ✭✭✭
    @ dylan_gauthier , I think it has problem with the axis which you selected to rotate the part.which may not be perpendicular to default plane.
    I have done some experiment results are as below,



    In both cases transform angle is 60 deg.
    7.PNG 32.3K
    7.1.PNG 19.5K
    8.PNG 25.7K
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