Converting from x-y to a-b coordinates-is this correct?

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The discussion focuses on the conversion from x-y coordinates to a-b coordinates, with a request for confirmation on the accuracy of the proposed conversion method. A visual representation of the two coordinate systems is included to illustrate the conversion process. Participants express uncertainty and seek clarification on the correctness of the conversion. The initial assessment appears positive, indicating that the proposed method might be valid. Overall, the thread emphasizes the need for expert validation of the conversion approach.
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Converting from x-y to a-b coordinates--is this correct?

Picture of the two relative coordinate systems, and what I think (though I'm unsure) is the correct conversion. If someone could reaffirm or deny this (and tell me what would be correct), that would be great! Thank you in advance! :)

169npg2.jpg
 
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Looks good.

Chet
 
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