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Alignment-rotate

I measured a line theoretically parallel to the X-axis but not at z=0 plane. I want to align X-axis paralell to this line but won't change the origin. So I used ROTATE XLUS around YPLUS. IT is not right.

When I did the initial alingment, I measured a cylinder, whose center line is Y-axis. So I used ROTAE YPLUS around ZPLUS. It seems right to me. What did I do wrong for the the above case?
Parents
  • The cylinder center line is Y-axis. And X,Z origins are on the center line. The face of the cylinder is Y origin. My flat surface is not in the Z=0 plane and not along Y-axis. I measured a line along X direction on the flat. Then I ROTAE XPLUS around YPLUS. That was I envisioned should be. But the result was wrong. I have no idea why.
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  • The cylinder center line is Y-axis. And X,Z origins are on the center line. The face of the cylinder is Y origin. My flat surface is not in the Z=0 plane and not along Y-axis. I measured a line along X direction on the flat. Then I ROTAE XPLUS around YPLUS. That was I envisioned should be. But the result was wrong. I have no idea why.
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