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1. The Parametric Part window is now open, in which you can define relationships between the parameters you've defined. First, enter a name for the part.
   
   The eventual part will be defined by only three parameters: the hole radius, distance between hole centers, and depth. All other parameters will be functions of these three.
2. The names of the parameters currently listed don't tell the user exactly what they are for, so we can add parameters with more obvious names. To do this, right-click on the first parameter on the list, and select Insert Parameter.
   
3. Name this parameter "HoleRad."
   
4. "HoleRad" is now first parameter on the list. Under "Value," enter the default radius that will be used when you first insert the part.
   
5. Under "Type," specify "Linear."
   
6. Create another parameter for the center-to-center distance between the holes. This parameter can be named "CenToCen." Specify an initial "Value" and "Type."
   
7. Under "Value" next to "H1," replace the number with "HoleRad." Do the same for "H2."
   
8. Define"R" as twice the hole radius.
   
9. Set "W" as equal to "CenToCen."
   
10. Now the three controling parameters needed for the part are defined. They are "HoleRad," "CenToCen," and "D." Click Finish to close the Parametric Part window.

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1. Continue in the file in which you defined the part. Select Insert / Parametric Part. Select the part you just defined.
   
   

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   Note: Load from File can be used to insert parametric parts saved in other files.

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2. Click to insert the part. The inserted part is shown to the right of the original geometry. Note that the two holes are equal, and that the polyline arc's radius is twice as large as the hole radius.
   
3. Select the part, and it appears in the Selection Info palette, with its three parameters available for editing. The initial values are the ones you set in the Parametric Part window.
   
4. Increase "HoleRad."
   
   The internal holes updates, as well as the overall radius of the part, which was set to be twice as large as the hole radius.
   In some instances you may get a warning message "Compound Profile is not up-to-date" when inserting the part.
   
5. Increase the "CenToCen" parameter value.
   
   The distance between holes updates, while the radius values remain the same.
   
6. The last value to change is "D."
   
   This changes the depth of the extruded part.
   

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