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Help needed, for seat back frame free state coordinate system

RobOntario
Good Morning all.

I am used to Datum A plane, datum B circle or round slot, datum C circle or round slot structure. I would say 100% of our over 100 programs are this kind of type. Last week, I got a free state part to program,

The setting was different: A1 and A2 were circles ( It was a tube at back frame upper part), B1 and B2 were circles too, which was assembled on the base ( Thinking about the second roll seats of the car, which could roll down the backframe ), but the issue was there was no dimension about B1 B2, PE told me they limited the rotation of the frame with the line between B1 B2. Last, C1 was a plane.

What in my mind is to get the generic feature of B which is the middle of B1 B2 ( I got B1 B2 from CAD too), to help rotate B to A.
LIN_TA2 is the line from circle A1 to circle A2
PNT_B is from CAD, the middle of B1 and B2

A6_ABC =ALIGNMENT/START,RECALL:STARTUP,LIST=YES
ALIGNMENT/LEVEL,YPLUS,LIN_TA2
ALIGNMENT/TRANS,XAXIS,CIR1_A1
ALIGNMENT/TRANS,YAXIS,CIR1_A1
ALIGNMENT/TRANS,ZAXIS,CIR1_A1
ALIGNMENT/ROTATE_CIRCLE,XPLUS,TO,PNT_B,AND,CIR1_A1,ABOUT,YPL US
ALIGNMENT/ROTATE_OFFSET,6.832,ABOUT,YPLUS
ALIGNMENT/END

Am I right? anything could be improved?

Thank you for any feedback..

It is a challenging for me
Parents
  • Hi Rob,

    I used to work for a company which manufactured seat frames here in the UK.

    Normally, the seat back was aligned by creating a 3D line between either the recline mechanism holes or the 'H' point. The 'H' point being the theoretical hip. Or it could be datum holes on both side-members. Your B1/2?
    Level the 3D line
    create a midpoint between the side-member datums measured with sample hits, again B1/2? This may then be your Datum XYZ.
    Measure a circle on the top tube and rotate from the datum to this circle. (the upper datum could be the symmetry of the headrest support tubes instead?). rotate to the required angle.

    It would be unusual if your main datum was at the top of the seat rather than the bottom.

    Maybe you could sketch out the drawing alignment?

    HTH.

    Neil
Reply
  • Hi Rob,

    I used to work for a company which manufactured seat frames here in the UK.

    Normally, the seat back was aligned by creating a 3D line between either the recline mechanism holes or the 'H' point. The 'H' point being the theoretical hip. Or it could be datum holes on both side-members. Your B1/2?
    Level the 3D line
    create a midpoint between the side-member datums measured with sample hits, again B1/2? This may then be your Datum XYZ.
    Measure a circle on the top tube and rotate from the datum to this circle. (the upper datum could be the symmetry of the headrest support tubes instead?). rotate to the required angle.

    It would be unusual if your main datum was at the top of the seat rather than the bottom.

    Maybe you could sketch out the drawing alignment?

    HTH.

    Neil
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