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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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  • I like the idea of trying to mimic what the ASME standard explains using tangent planes and extracting the furthest points using variables and constructions. How often is this actually used in practice though?

    Too seldom :-)

    Jokes aside, if your parts are perfect, you don't need this. The worse your parts are (rough surface, form errors, out of square datums, etc.) the more important it gets. I'd guess machined parts are almost always 'good enough', welded parts could be trickier (but mostly have larger tolerances)...
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  • I like the idea of trying to mimic what the ASME standard explains using tangent planes and extracting the furthest points using variables and constructions. How often is this actually used in practice though?

    Too seldom :-)

    Jokes aside, if your parts are perfect, you don't need this. The worse your parts are (rough surface, form errors, out of square datums, etc.) the more important it gets. I'd guess machined parts are almost always 'good enough', welded parts could be trickier (but mostly have larger tolerances)...
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