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Alignment to offset holes?

Stephen McMillan
Hi all. First post. Sorry if it's a rookie question.

I want to do a Plan-Circle-Circle alignment.
The first hole is the x0 y0 origin.
The second hole has some given coordinates, say x8.0, y4.0.

I don't want to have to calculate the angle and use the "Offset angle" in the "Rotate to" field.
I also don't want to use an iterative alignment.

Any ideas?

Thanks,
Steve
Parents
  • 1) If you were to build a hard gage, the slot you would cut for the pin would be parallel, not slanted by the calculated angle.
    2) If the offset were to be to an angle, why wouldn't the offset be listed as a basic angle? Isn't the intent of the standard to be clear, and this is not clear.
    3) If the hole weren't offset, and actually in line, would you be suspicious if you reported X and Y and Y was not zero? But not suspicious when the basic wasn't the basic value?
    4) I'll bet a dozen doughnuts the intent is the datum hole is "perfect" in the perpendicular axis, and I'll be fatter than I am now.
    5) The figure I showed from the standard indicates the distance is exact, the diagram doesn't show it being rotated back.

    These are my arguments off the top of my head. I'm sincerely interested in factual based reasons as to why the rotation is the correct method.
Reply
  • 1) If you were to build a hard gage, the slot you would cut for the pin would be parallel, not slanted by the calculated angle.
    2) If the offset were to be to an angle, why wouldn't the offset be listed as a basic angle? Isn't the intent of the standard to be clear, and this is not clear.
    3) If the hole weren't offset, and actually in line, would you be suspicious if you reported X and Y and Y was not zero? But not suspicious when the basic wasn't the basic value?
    4) I'll bet a dozen doughnuts the intent is the datum hole is "perfect" in the perpendicular axis, and I'll be fatter than I am now.
    5) The figure I showed from the standard indicates the distance is exact, the diagram doesn't show it being rotated back.

    These are my arguments off the top of my head. I'm sincerely interested in factual based reasons as to why the rotation is the correct method.
Children
  • in reply to RandomJerk
    RJ, If your part print shows the datum feature (tertiary) as a slot not at an angle the offset line is the correct method. That float your boat?
  • in reply to RandomJerk
    1) You wouldn't use a pin, you would use a diamond. For basic at both axes, the diamond pin would lock rotation perpendicular to line BC.
    2) The 2 basic dimensions define an angle, because they are the legs of a right triangle.
    3) Yes, Y would be zero, because it's inline with BC. Inline with BC allows the hole to deviate along line BC without affecting the rotation of the part.
    4) I would take that bet, if I ate donuts.
    5) The figure shows what the DRF looks like, not how you got there.
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