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Useful Data from Ellipse Measurement

dhavener
Hello All,

I was asked by a manager to take a good part and a bad part (based on customer feedback) and measure an ellipse on each to get some useful data that we can then take to our EDM or CNC to machine a go-no-gage for our extrusion press:

Couple questions:
  1. How can I measure an ellipse in PCDMIS? I would assume using the cad file and auto features?
  2. Can I pull useful data out of this measurement that I could use for a gage design? Would this be a major and minor diameter or could I pull a point cloud of radii from the center of an ellipse to just recreate the measured ellipse?
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  • There is an auto feature for an ellipse, so a CAD file is not necessary, but it is helpful. A Cad model could also give you more measuring options such as measuring with a bunch of vector points or scans and constructing an ellipse from those.

    You can report the major diameter, minor diameter, position of the center, and profile. It seems to me like reporting the profile and graphing it would be most useful if you are establishing it as a gage.

    If they want individual point data, you can align to the center of the ellipse and report the XYZ location of each point, or report the points in polar coordinates (angle and radius). In newer versions of the software (2018+?), you can report the individual points by opening the location reporting dialog window, select the ellipse, then click on a point on the ellipse. If you don't have many points, you can do that for each of them. If you have a whole lot of points, you can do that to report the first point, then go to the edit window and copy/paste many copies of the dimension and update the reported point number for each.
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  • There is an auto feature for an ellipse, so a CAD file is not necessary, but it is helpful. A Cad model could also give you more measuring options such as measuring with a bunch of vector points or scans and constructing an ellipse from those.

    You can report the major diameter, minor diameter, position of the center, and profile. It seems to me like reporting the profile and graphing it would be most useful if you are establishing it as a gage.

    If they want individual point data, you can align to the center of the ellipse and report the XYZ location of each point, or report the points in polar coordinates (angle and radius). In newer versions of the software (2018+?), you can report the individual points by opening the location reporting dialog window, select the ellipse, then click on a point on the ellipse. If you don't have many points, you can do that for each of them. If you have a whole lot of points, you can do that to report the first point, then go to the edit window and copy/paste many copies of the dimension and update the reported point number for each.
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