I J K vs Nx Ny Nz

[[Ra...]]

I'm currently troubleshooting an old program from before my time. I'm trying to wrap my head around these numbers.

 

I was under the impression that the nominal IJK and Nx Ny Nz should always be the inverse of each other, but this program shows otherwise. Even when I create a new point using this alignment, these vectors don't match.

 

Below is a space point.

So, my question: Is the cause of this because the alignment? Software bug? Or does it make sense and I'm just not understanding?

Calypso 2019.

 

Thanks!

[[Cl...]]

Why do they display it two different ways?

Edited July 10

[[Ra...]]

My original interpretation is that the IJK values are the nominal vectors, but not the probing strategy vectors. So the probing strategy, (nx ny nz) will be the inverse of the nominal point vector. But now I'm doubting my understanding of trigonometry/Calypso.

[[Ri...]]

Make sure the Space Axis of your point is correct. Right now, it is not shown, so we have no idea what Space Axis it is displaying those I J K vectors from. 

[[Ke...]]

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This appears to be correct...

When you take a point from the CAD model on a Plane in Z, the ijk is 0,0,1 na the Nx,Ny,Nz is 0,0,-1

However, when I manually probed a point, the ijk was 0,0,1, but the Nx,Ny,Nz was slightly off at 0.0045, 0.0625, -0.998... which I was not able to manually edit, BUT, under "Project Point Onto", I selected "Nominal Cad Geometry" and after I toggled around the "Coordinates Relative To" selections, the Nx,Ny,Nz changed to 0,0,-1

 

Hope this helps!

[[Ra...]]

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I apologize Richard, I'm still re-figuring out Calypso, and I'm not quite sure what you mean. I don't see space axis for the space point anywhere, and the help file isn't helping. I thought the IJK vectors were just derived from the feature's alignment, and perpendicular to the CAD surface selected.

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That makes complete sense to me! However, my issue is that I'm offline and it's showing these values without any measured data, and even during point creation. But seemingly, only on alignments that aren't "square" to the base alignment. Before I correct them, I just wanted to understand why it's happening, and if there was any logic to it. Maybe the values are correct and I'm just ignorant.

[[Ke...]]

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I'm presuming that you modified the nominals from the point that you clicked on... but either way, try selecting Project Onto -> Cad Geometry, close the window and then re-open it to see if anything changed 🤷‍♂️

Also: are you clicking on an angled plane, a sphere, a freeform surface, or ?

Including images of your features, points, etc. goes a long way to getting the answers you want 

[[No...]]

deleted 🙄

Edited Friday at 07:51 AM
error

[[Ma...]]

Since you can not edit those values in strategy, then i think it's  just an informative, but approach vector will be defined from the feature's vectors.