Pro Modelers, When drafting the end of a cylinder, I usually choose the edge as my draft hinge. Pro then picks the end of the edge as the draft point and invariably this is not the point I want, I suppose this is because Pro looks at a cylinder as two semicircles extruded. Short of putting in a tangential plane every time, is there any way to force the draft point to the middle of the edge?
Hi Richard, The draft method you describe will not give you a flat draft surface so unless this is your intention to have a curved surface you want to use neutral plane instead. I have made three pictures part way through the draft feature that show what I mean. Hopefully they will come through the size limit.
draft_use_edge_15.jpg Shows the method I think you are describing. The top semi circle of the cylinder stays unchanged and a curved draft surface drafts away from the original face using the central datum as the pivot direction (you could also use something like a default coordinate system for this). Sometimes it is important for an edge to remain true in which case then use this method. The draft in the picture does not show up so clearly but you can see that it follows the top semi circle and gets darker as it gets to the far side indicating that the surface has gone behind itself.
draft_neut_plane_ctr_15.jpg Drafts the same end cylinder surface but uses the central plane (though the ends of the semicircles) as the neutral plane and draft direction. This gives a flat drafted surface. Probably the most used method as it allows non connected surfaces to be drafted using the same neutral plane
draft_neut_plane_top_edge_15.jpg Drafts the same end cylinder surface but uses a top datum plane made tangent to the cylinder as the neutral plane and draft direction. This gives a flat drafted surface.
Depending on your construction both of the last two methods may require a constructed plane if there is not one already available to use.
- wrote: > > Pro Modelers, > When drafting the end of a cylinder, I usually choose the edge as my > draft hinge. Pro then picks the end of the edge as the draft point and > invariably this is not the point I want, I suppose this is because Pro > looks at a cylinder as two semicircles extruded. Short of putting in a > tangential plane every time, is there any way to force the draft point > to the middle of the edge? > > Your help is always appreciated, > > Richard A. Black > tel: 269 781-0539 > - > http://www.automotive.eaton.com > > > > --- > > You are currently subscribed to model. > To unsubscribe send a blank e-mail to > -. > > For assistance, email us at - or find other > contacts at www.ptcuser.org/org/contacts.html. > > PTC/USER and the PTC/USER logo are registered trademarks of PTC/USER, > Inc. > Pro/ENGINEER is a registered trademark of PTC. > > Message authors are solely responsible for the content of their posts.
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