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Alignment-rotate

Heming
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?
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  • Thanks, Matt.

    I need to explaine a little bit more about my situation. I have a fixture (just two centers) to hold a cylinder part. I did my alignment of the fixture and it was no problem. When I load my part into the fixture, I have to make extra alingment as the part can rotate around the center. So here it is not a full blown alignment. So I measure a line along a flat surface. The line is theoretically parallel to X-axis. So that is where my original question came from.
    IF you have a cylinder, the axis of the cylinder will be the LEVEL and 2 axis origin (not the one that is used for level) and the BASE or FACE of the cylinder CAN be used for the last axis origin, thus the cylinder & end of cylinder are constraining 5 of the 6 DOF of the part. The only DOF left is the rotate. This would need to be a line NOT along the axis of the cylinder and NOT along the base/face of the cylinder as these DOF are all taken care of. The remaining DOF would be if you were to place the cylinder ona mill and cut a flat on it, and the flat direction as it intersects the diameter of the circle (in 2 places) will be the last DOF. SO, to measure a line THERE, you need to level to the cylinder axis and whatever workplane you level the cylinder to is the workplane you need to measure that line in and the rotate will be the rotate axis ABOUT the level axis.
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  • Thanks, Matt.

    I need to explaine a little bit more about my situation. I have a fixture (just two centers) to hold a cylinder part. I did my alignment of the fixture and it was no problem. When I load my part into the fixture, I have to make extra alingment as the part can rotate around the center. So here it is not a full blown alignment. So I measure a line along a flat surface. The line is theoretically parallel to X-axis. So that is where my original question came from.
    IF you have a cylinder, the axis of the cylinder will be the LEVEL and 2 axis origin (not the one that is used for level) and the BASE or FACE of the cylinder CAN be used for the last axis origin, thus the cylinder & end of cylinder are constraining 5 of the 6 DOF of the part. The only DOF left is the rotate. This would need to be a line NOT along the axis of the cylinder and NOT along the base/face of the cylinder as these DOF are all taken care of. The remaining DOF would be if you were to place the cylinder ona mill and cut a flat on it, and the flat direction as it intersects the diameter of the circle (in 2 places) will be the last DOF. SO, to measure a line THERE, you need to level to the cylinder axis and whatever workplane you level the cylinder to is the workplane you need to measure that line in and the rotate will be the rotate axis ABOUT the level axis.
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