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2D or 3D Dimensions

bradburrows
Hello,

I'm quite new to the CMM universe and I have a measuring task where I'm unsure if I evaluate it correctly.

The task is the distance between MP_D2 and D2_DOM8.25_P2.

I read that the 2D distance is a projection of the measuring points on a plane referring to the coordinate system.

And that the 3D is the distance referring to the part?

I dont know how I should evaluate it and the differ of both results is really high.

Thanks in advance!

Best regards, Brad.
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  • 2D is the angle between 2 lines projcted in the actual workplane, 3D is the angle measured between lines without any projection, along a vector perp to both vectors.
    In Z workplane, it should be :
    ASSIGN/V1=UNIT(LN1.IJK*MPOINT(1,1,0))
    ASSIGN/V2=UNIT(LN2.IJK*MPOINT(1,1,0))
    ASSIGN/ANGLE_2D=RAD2DEG(ACOS(DOT(V1,V2)))

    ASSIGN/ANGLE_3D=RAD2DEG(ACOS(DOT(LN1.IJK,LN2.IJK)))
    It's measured along
    ASSIGN/V3=CROSS(LN1.IJK,LN2.IJK)
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  • 2D is the angle between 2 lines projcted in the actual workplane, 3D is the angle measured between lines without any projection, along a vector perp to both vectors.
    In Z workplane, it should be :
    ASSIGN/V1=UNIT(LN1.IJK*MPOINT(1,1,0))
    ASSIGN/V2=UNIT(LN2.IJK*MPOINT(1,1,0))
    ASSIGN/ANGLE_2D=RAD2DEG(ACOS(DOT(V1,V2)))

    ASSIGN/ANGLE_3D=RAD2DEG(ACOS(DOT(LN1.IJK,LN2.IJK)))
    It's measured along
    ASSIGN/V3=CROSS(LN1.IJK,LN2.IJK)
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