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Tertiary Datum doesn't constrain any degrees of freedom?

brian.freeman
2023.1--Selecting Datum A as a plane; Datum B as a hole, Datum C as a hole.
"GEOMAJIC" States Datum C doesn't control any degree of freedom
Without Datum C, Datum B doesn't constrain the final degree of rotational freedom.
Am I wrong here?
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  • cir_b =feat/contact/circle/default,cartesian,in,least_sqr
    theo/<0,0,0>,<0.000003,0.9990898,-0.0426563>,0.25
    actl/<0,0,0>,<0.000003,0.9990898,-0.0426563>,0.25
    targ/<0,0,0>,<0.000003,0.9990898,-0.0426563>
    start ang=0,end ang=360
    angle vec=<-1,0.000003,0>
    direction=ccw
    show feature parameters=no
    show contact parameters=no
    a4 =alignment/start,recall:a3,list=yes
    alignment/iterate
    pnt target rad=0.002,start label=l1,fixture tol=0,error label=
    meas all feat=always,max iterations=5,level axis=yaxis,rotate axis=xaxis,origin axis=zaxis
    level=pnt_a1,pnt_a2,pnt_a3,,
    rotate=cir_b,cir_c,,
    origin=cir_b,,
    alignment/end
    pln_a =feat/plane,cartesian,outline,no,least_sqr
    theo/<0.333245,-0.032703,-7.713798>,<-0.0000003,-0.9999999,-0.0004866>
    actl/<0.333245,-0.032548,-7.704548>,<-0.0000003,-0.9999999,-0.0004575>
    constr/plane,bf,pnt_a1,pnt_a2,pnt_a3,,
    outlier_removal/off,3
    filter/off,wavelength=0​

    Yep - Dat B is not perp (at least mathematically as PC-Dmis sees it) to Dat A, therefore it's constraining rotation also.
  • in reply to NinjaBadger
    In most ways this really is confusing. In actuality the final degree of rotation is not fully constrained. IF you use the auto align system; it uses both B and C to constrain the final degree of rotation??!
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