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Plane line point vs plane plane plane

Smallsvillanova
Hello everyone,

I am aligning and programming utilizing a J-corner fixture. In my experience i have been told that aligning to plane plane plane would be ideal for several reasons. My colleague believes that a plane line point is better. I do not have as much experience as he does but through all my training i have been told that whenever possible i should align to 3D features. Any insight, experience stories, or bits of wisdom are greatly appreciated.

Thank you!
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  • What said is right, but if you look at 2019R2 or some threads here, you can see that the 2nd datum (plane perp to the first and tangent to the surface, which minimizes the max distance is representated by a line. And the third by a point.
    The most difference with your colleague approach is that there are constructed features ansd not measured ones.

    For a manual pre-alignment, Plane - line - point is often enough, what said.

    And a line can be a primary if it's a cylinder axis...
  • in reply to JEFMAN
    Thank you very much for your input, your help is greatly appreciated. As I said I'm not very experienced I have two years of programming experience being taught by someone who never took any formal classes and I just took the level one class very recently. When you are thinking about programming a part in measuring the features to the gd&t how is it that you decide is the best method to measure something? Do you have a set of standards that you follow that give you a definitive guideline on how everything needs to be measured? Or are you simply using experience and your knowledge of gd&t ?
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  • in reply to JEFMAN
    Thank you very much for your input, your help is greatly appreciated. As I said I'm not very experienced I have two years of programming experience being taught by someone who never took any formal classes and I just took the level one class very recently. When you are thinking about programming a part in measuring the features to the gd&t how is it that you decide is the best method to measure something? Do you have a set of standards that you follow that give you a definitive guideline on how everything needs to be measured? Or are you simply using experience and your knowledge of gd&t ?
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