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APRIL 1998

Cross Hatching with Curves and Cosmetics

     Occasionally cross hatching is needed on a drawing to represent something not physically in the model -- manufacturing areas for instance.  For these cases, the areas can be displayed using either a Xhatched Datum Curve or a Xhatched Sketched Cosmetic.

What are these?

     In the feature creation dialog box for a sketched datum curve (and in the menus of sketched cosmetics) there is an Optional element called Attributes.  For a closed datum curve, you may select Attributes / Define / Xhatch to create cross hatching within the boundaries of the curve.  This cross hatching can then be displayed on the drawing to represent the areas you desire.

     Note:  Up to now I have been unable to change the cross hatching in part mode, but in drawing mode, Modify / Xhatching (pick the curve not the cross hatching) works pretty well.

     Another reason for using Xhatch Curves is to "Cheat" in the display of certain features on the drawings.  For those who have worked with spline or gear drawings in 2D, Section B-B shown below is usually accepted as a correct way of showing gear and spline teeth in cross section.  However, unless you are using even numbers of spur gear teeth and exactly placed spline teeth, your cross sections in Pro/E will appear more like Section A-A.  Sometimes that means we need to cheat to accomplish the desired look.

     To display the gear as shown in Section B-B, a Family Table Instance was created without the teeth.  Next a datum curve from Intr Surfs was created using the cross section datum plane, (Yes, section "B" is required) and the Whole part.  Next a sketched datum curve on the same datum plane with Use edge / Chain of the previous datum curve, and Graphic for April Tip
sketching the spline, and gear tooth root diameters.  The option for Xhatching was used, and the result is Section B-B.  (you could skip the surface intersection datum curve and use edge on the geometry, but it would be slow, and not very robust to model changes.)

     On the drawing the view was placed and oriented for X-Section B.  The cross hatching of Section B was expanded (wide) so it does not appear in the view, then the cross hatching of the curve was modified as shown.  Some doctoring was required in putting the curves (except the root diameter curves) on a layer, then changing the line style of the root curve to "geometry".

     If you deal with these kinds of issues, this is a trick worth trying.  Don't forget the Users Guides if you run into trouble.

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