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Local Alignment vs Carline Alignment

mipateluk@gmail.com
Hello
I was wondering if anybody had a good way of explaining local Alignment coordinate system in terms of automotives applications? Vs Carbody Alignment. Really difficult for me to fine clear easy to follow explaination

​​​​​​​Thank you!
  • I have no experience with automotive but it sounds like what I did in aerospace. If I'm correct, the local alignment would be an alignment of the part by it's self and the car body alignment would be part coordinates from the car as a whole.

    In aerospace, most of our parts had a trihedron on the part itself but some of them the trihedron was way off the part because the CAD was showing part location on the plane. We call the two sets of coordinates part coordinates and aircraft coordinates.

    I may be wrong in your case but it sounds like what you are describing.
  • Imagine an entire car broken down into thousands of different 3d models. Now, consider only one bolt from that assembly.

    Local Alignment: trihedron is on the bolt itself

    Car Body: trihedron is where the center of the car's engine would be (or another important engineering point that should be defined on the blueprints by the designers) and the bolt is at the XYZIJK location/orientation it would be in the overall assembly model for the car in reference to that defined "center point"
  • Imagine an entire car broken down into a thousands of different 3d models...

    Local Alignment: trihedron is on the bolt itself

    Car Body: trihedron is where the center of the car's engine would be (or another important engineering point that should be defined on the blueprints by the designers) and the bolt is at the XYZIJK location/orientation it would be in the overall assembly model for the car


    Yeah... That's what I meant! Rolling eyes
  • Thank you DAN_M and A-machine-insp!

    I was wondering is there a way to 'transform' the XYZ results of one alignment (carbody) to another alignment (local) by hand calculations? would you happen to have an example? sorry I know this can be done easily in PCDMIS but interested in learning how I can transform a few results without using software.

    Thanks
  • Thank you DAN_M and A-machine-insp!

    I was wondering is there a way to 'transform' the XYZ results of one alignment (carbody) to another alignment (local) by hand calculations? would you happen to have an example? sorry I know this can be done easily in PCDMIS but interested in learning how I can transform a few results without using software.

    Thanks

    if you have a physical blueprint...and you have NO software to help you...and you want to calculate the exact car body position of a particular item in an assembly relative to something else.....of course that could be done but you'd have to go old school with it and follow the blueprints and methodically do the trig to see where it ends up. Sorry I have no examples to provide you, have never had to do this before but know that it is definitely mathematically feasible
  • Thank you DAN_M and A-machine-insp!

    I was wondering is there a way to 'transform' the XYZ results of one alignment (carbody) to another alignment (local) by hand calculations? would you happen to have an example? sorry I know this can be done easily in PCDMIS but interested in learning how I can transform a few results without using software.

    Thanks

    I have done it before with a CAD model that was imported at aircraft coordinates but I don't work at that shop anymore. I do surgical now so it's no longer something I have to deal with and I have no examples to give. Sorry.
  • So, you have a car-position alignment all done for your part. Now you want to do a local alignment, as in, a specific hole, you want it to be X0 Y0 so you can dimension other thing to it. No big deal, simply make an alignment, pick that hole, set X & Y origin to it, and you are done. Go make your dimensions. Other than that, it is a simple math problem. Rotating and/or re-leveling, that's a different kettle of fish.
  • In terms of doing this in the software (I know it's not what you asked for but it's worth mentioning).

    You need to start with a CAD model in Car/Aircraft Align.

    You can then either

    a) do an iterative alignment (this maintains car/aircraft alignment) and then origin locally on the actual part - you can then switch between them by recalling the local or iterative alignment

    or

    b) leave the model in aircraft align, but define features on the model for a local alignment, once locally aligned there's an option under F5 setup (force alignment in car body - or something like that I think) which will revert to aircraft/car body alignment.
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