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Beginner alignment

Ricky Perdue

DOCX

I have a somewhat newbie question.   See attached doc for my attempt to help explain.  I have to align this part to BCD.   -B- is a plane in 0,-1,0 (facing me).   -C- and -D- are counterbores of thru holes.   So I level -B- to Y- and set -B- as my Y origin.  I'm stuck after this.  I don't know how to rotate -C-.  Or even what my rotation should be.   I want the part facing the same direction I have it in (Y-) when I align it to BCD.   Can I create a line from -C- to -D- and rotate that about Y-?   Or is that "illegal" from a GD&T standpoint (meaning should only -C- be rotated and not a -C- / -D- line?)  If I can make a -C- / -D- line do I have to trig it out to get the angle to rotate.  I'm baffled to be honest.   I appreciate any help any one can offer.  Thanks so much.  

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    The easiest method would be to open the alignment utilities box, select your 3 features in the correct order of datum precedence from the list (Datum B first, then C, then D last), and then hit the little button on the bottom right that says "auto-align". You can then look at each step it created to verify it is restraining the correct degrees of freedom you want. 

    You could create a line and rotate about Y, however the software is basically doing that behind the scenes anyway. So it wouldn't be illegal or incorrect, just slightly unnecessary. Your trihedron will look offset, like in the picture here. That will really only impact your nominals, and it may bug you to look at. You can then certainly add a rotation to straighten the trihedron out, if you know the degrees. 

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  • 0

    The easiest method would be to open the alignment utilities box, select your 3 features in the correct order of datum precedence from the list (Datum B first, then C, then D last), and then hit the little button on the bottom right that says "auto-align". You can then look at each step it created to verify it is restraining the correct degrees of freedom you want. 

    You could create a line and rotate about Y, however the software is basically doing that behind the scenes anyway. So it wouldn't be illegal or incorrect, just slightly unnecessary. Your trihedron will look offset, like in the picture here. That will really only impact your nominals, and it may bug you to look at. You can then certainly add a rotation to straighten the trihedron out, if you know the degrees. 

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