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Old problem and again I struggle...CAD, Cyl shaped part, alignment

d.evans
I have a part that basically looks like a Gauge Pin with a hole drilled thru it (90 perp to the longitudinal axis of the cyl).

I am having a very difficult time trying to get this thing aligned using CAD. I have tried 3 points on one of the flat ends, then 2 points along the length, and a single point on "top" about halfway between the thru hole and the nearest end.

Get Iterative Alignment error.

If I dont use iterative alignment, and instead use cir at one end, a cir at the other end, and the thru hole, I can't get the features to "stick" to the CAD.

I've got the part laying on its side inside a R&R AVP 11-20 V-shaped standoff, with the thru hold pointing up, and the length of the part inline with the machine's X-axis.

Running PCDMIS 2013MR1
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  • Datums. Align to the datums.

    OR, measure the OD as a cylinder.
    Measure that ID as a cylinder
    Measure a POINT on one end.

    Level to OD cylinder
    Rotate to ID cylinder
    Origin to OD Cylinder (2 axis) and point on end

    6 DOF locked.

    If that ID cylinder isn't square to a rotate axis, so what? You MUST KNOW what it's angle is to the cad axis, you do the LEVEL, ROTATE, ORIGIN, ORIGIN, ORIGIN, then ROTATE ABOUT using the angle it is off 'square', then do origin (axis) OFFSETS if needed.

    Looks pretty simple to me really.
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  • Datums. Align to the datums.

    OR, measure the OD as a cylinder.
    Measure that ID as a cylinder
    Measure a POINT on one end.

    Level to OD cylinder
    Rotate to ID cylinder
    Origin to OD Cylinder (2 axis) and point on end

    6 DOF locked.

    If that ID cylinder isn't square to a rotate axis, so what? You MUST KNOW what it's angle is to the cad axis, you do the LEVEL, ROTATE, ORIGIN, ORIGIN, ORIGIN, then ROTATE ABOUT using the angle it is off 'square', then do origin (axis) OFFSETS if needed.

    Looks pretty simple to me really.
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