Creo Parametric Drawing Section View

[Kay Hamling]

Youcannot create a 3D section using a sphere to define a zone for cutting. The documentation is lacking for zone sections as it is for most nontrivial functions. This is why the 3D section option is greyed out in the drawing views. Zones were added to the software originally for selection purposes and were extended to 3D sections at some point but the only option that will yield a 3D section is the half plane option. If someone else knows how to use a quilt to create a 3D section, please respond.

Create the spherical cut in the box part and then create an instance that includes the cut using family table. Create a second instance that does not include the corner cut out. You can then create a simplified rep in the assembly specifically to show the corner of the box removed and one with box intact. You should be able to use these simplified reps on a drawing view(s) to illustrate your desired images.

I have the option to turn the quilts off as "yes" so they are suppose to not be shown. If the view is a full view it works, but as soon as I add a section to the view, the quilts are turned on in the view and I cannot turn them off.

Do you have your settings so that you get layer properties for each view? If so you may need to select the view in the layer tree and hide the layer that contains it or put it on a layer if it's not already.

Thank you for the reply. I have gone into the drawing and changed the model tree area from the model tree info to the Layers info, and have the view listed in the line where the arrow is, to have this be what the layer info is about. Now I am not sure how to proceed from here. I do not know what layer this info is on.

So in the drawing if I do not have a section, I can pick the option under the View Display category for "Hidden line removal for quilts" to be YES and in a non-section view the representation for these External Copy Geom features are not displayed. But as soon as I add a section, I cannot get rid of the quilts as i did in a non section view.

I found what I needed to do, as I had to add the features in the model to a layer. But when I go into the drawing and hide the layer, to much geometry gets hidden. So I think I have to work with the layer to decide how much to put on it so when I do hide the layer I have enough to represent my part.

We have found over the years in using Pro/E, that there are some other things that work differently, like datum planes. If you have datum planes in a model, you can toggle them on and off. But as soon as you pick the datum plane and do an "Edit / Properties" and change it to be a GETOL type datum, you can no longer just do the datums toggle to turn its diplay on and off.

I'm assuming you are talking about the hidden line removal for quilts option. My understanding of this option is that it means it includes quilts when determining hidden lines not that it removes quilts from the view. If your view has the no hidden display style and the surface is behind something else the quilt will not appear in the view. If the display style is hidden line the portion of the quilt behind something else will display as a hidden line. For the section my guess is the surface is cut by the plane so there is nothing in front of it so it displays as a quilt surface normally does.

You can remove quilts by creating a new layer and hiding it, or by currently using the Surface layer. Go to the layer menu, click on the surface layer-then layer properties-add-include and select the quilt you want to hide. Then turn that layer off or hide it.

I have an assembly, I'll call it assembly 1, that uses mechanism so that its components can be rotated to a different position in the next level assembly, I'll call it assembly 2, than what is used on the assembly 1 drawing. I created a snapshot of assembly 1 in the orientation needed for the drawing, placed the view in the drawing and set the drawing view assembly explode state to the snapshot. Everything looks good so far.

Next, I go back to the assembly 1 model, select the Drag Components command, rotate a couple of the parts about their motion axis, left mouse button to accept the position, close the Drag Components window; this is being done simply to represent a random orientation that the assembly could exist in and where the assembly 1 model could potentially be saved in. This is where the problem arises. When going back to the drawing, the orientation of the parts within the local section spline does not match the orientation of the parts as they were defined in the snapshot; instead, the orientation of the parts matches the orientation the assembly was left in when the most recent Drag Components command was executed. What makes this really confusing is that the orientation of the parts in the portion of the view that is outside of the local section spline is in the correct orientation defined in the snapshot.

Is there any way to get the section to show the parts as they are defined in the snapshot? I've tried defining a Combination State as well that included the section view and the exploded view defined by the snapshot; this works perfectly in the model but not in the drawing.

Good modeling practice dictates that Assembly 1 be assembled into Assembly 2 as a sub-assembly. Reassembling individual parts of Assembly 1 into Assembly 2 would mean the models are no longer parametric.

Below is a representative model tree. There are many more sub-assemblies and parts within Assembly 2 but it's not pertinent to this issue. Parts 31, 32, 33 are the parts I was specifically referring to in my OP but there are other assemblies within the product where we also ran into the same problem.

(1) There's interference between two parts. For example, a pin is 0.5000 diameter, but the hole it's going into is 0.4990 diameter. Creo will decide to omit lines at the interference, but not consistently.

(2) Sections that have been defined in previous versions of Creo, maybe even a previous build code, will not interpret section views correctly. It might be the definition of the view direction in the part/assembly. Unfortunately, I usually find that the only way to fix this is to take the section out of the view, finish editing the view properties, then edit the view properties again and add the section back in. I hate it, but it usually works.

The intersection of the gold outer part with the bronze center post part is what I'm talking about. There is an interference between the two. I'm guessing because the gold part is modeled with the minor diameter of a thread? This kind of thing throws the hidden line removal and section display algorithms off, so you get strange depictions of the crosshatching.

Sometimes, when I'm troubled by it enough, I'll fix these types of things by having a family table version of the part with the holes in it where the hole diameters are suitable to prevent this kind of thing. That version of the part is only used in the assembly, while the part that is depicted in drawings and/or used in manufacturing is the "actual" correct geometry. It complicates things a bit, but if I want those views to look right I'm willing to suffer the extra trouble.

The option has to be chosen when you create the section. I think it cannot be redefined after, but it is easy enough to create a new, coincident section and replace the existing one. Once replaced, delete the original section and then rename the new one to the original name.

"You need to cut the cross-section through "Model & Quilts". You will have to re-create your cross-section to select this option. And make sure you have "Remove quilts in total x-sec" set to yes in your DTL file. Then you should be able to seld "HLR for quilts".

I guess its not an edge either. Cosmetic features cannot be erased so you can remove all cosmetic features at once which include welds and threads. Otherwise, I still see no quick way to manage these without layers.

Finally, you will also note that layers play havoc with the weld symbol annotation. Once deleted, it should be recognized as being available for show-annotation... but it doesn't. Maybe only a bug in my M040 version of Creo 2.0

In the end, prior to pdf-ing it, I hid the welds in the model and manually drew in the weld fillet in the right hand view where they should be visible. A bit of a dirty work around, and not something I should have to do!

I went into the sketch mode in the drawing, toggled the parametric sketch option on and projected the weld edges I needed as hidden and once created (while still highlighted) I changed them to the Hidden line style. I then went through the drawing layer per view routine to hide the weld in that view.

When I changed the weld parameter, the drawing edges updated but when I added an additional segment, of course, I had to create the new edges again by projecting them. Using intent edges may solve this but in general, you get the idea.

Not being able to change the line style of the weld edges is somthing that appears to be a major oversight on PTC's part. Simon, have you considered asking tech support how PTC expects such a feature to be managed in drawings by opening a support case? If you have maintenance, you have every reason to get their input.

You realize, per typical drafting standards, that welds are not depicted anyway? Just the weld symbol. It would be a nightmare amount of work to draw those things so the industry doesn't show welds at all. All that is needed is the label. PTC should rightfully say, don't show them at all on drawings.

I think there is a toggle to turn the weld quilts off and just have a line for the weld symbol. The terms 'Solid' and 'Light; show up in _hc/creo30_pma_hc/usascii/index.html#page/pma/welding/About_Conver_Welding_Geom_Types.html but it doesn't explain the difference. Another place calls them 'surface' and 'light.'

I asked, because I have done a lot of sections with quilts in them using the Model and Quilts option and it always came out OK. Maybe Simon used it and it didn't work for some reason, but I didn't see that he says so one way or the other.

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