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Construct Plane: using 2 surfaces what is the best approach?

BIGWIG7
I have a datum that is 2 separate plane surfaces with opposing vectors but on the same center line.

What is the best approach: creating a few independent points on both surfaces and combining them into one plane OR creating 2 separate planes and then Constructing a plane from them?

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  • I'm not sure why people are advocating a width in this example. I'm not saying it's wrong but from the description it doesn't sound like in terms of function it behaves as a width.

    I'm not even sure if it would be a valid datum.

    I'm picturing two nominally coplaner planes but facing opposite directions from each other, the fact they're nominally coplaner but facing opposite directions suggests to me they're offset from each other?



    Oh, you're right.

    Sorry BIGWIG7. I misunderstood the question. Re-reading it now, I see that you explained that they are coplanar (on the same CL).

    I'm inclined to try NinjaBadger's idea.

    With a Width or a Midplane I would worry that the vector would not calculate consistently. It seems like it may decide to flip the measured vector on you between runs depending on which surface is higher in the current alignment.

    ​
Reply
  • I'm not sure why people are advocating a width in this example. I'm not saying it's wrong but from the description it doesn't sound like in terms of function it behaves as a width.

    I'm not even sure if it would be a valid datum.

    I'm picturing two nominally coplaner planes but facing opposite directions from each other, the fact they're nominally coplaner but facing opposite directions suggests to me they're offset from each other?



    Oh, you're right.

    Sorry BIGWIG7. I misunderstood the question. Re-reading it now, I see that you explained that they are coplanar (on the same CL).

    I'm inclined to try NinjaBadger's idea.

    With a Width or a Midplane I would worry that the vector would not calculate consistently. It seems like it may decide to flip the measured vector on you between runs depending on which surface is higher in the current alignment.

    ​
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