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How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

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How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

Hi,

I'm using Creo 2.0 and trying to revolve a mirrored sketch using a centerline that is outside the sketch as the center of revolution (specifically, an axis datum I made by intersecting two planes). However, when inside the sketch, I used the "centerline" sketch tool in order to provide a line with which to mirror the sketch about. Because the sketch contains a centerline, the revolve feature automatically thinks that I want to use this internal sketch centerline to revolve the sketch about, but this is not allowed to happen because "All entities must be on the same side of the revolving axis." Thus, the section is deemed incomplete, and I cannot complete the sketch.

How do I tell Creo I want to use an external centerline, not the one I used in the sketch, as the axis of revolution?

Thanks for your help

1 ACCEPTED SOLUTION

Accepted Solutions

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

When making the sketch add the external axis as sketch reference. Then create a revolve centerline and align it to the axis reference. The revolve feature will now use that revolve centerline instead of any other construction centerline in the sketch.

Regards, Jan

View solution in original post

17 REPLIES 17

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

It's an option when you are creating the feature, but outside of sketcher. I always made it a habit to sketch a revolve centerline before anything else in a sketch due to long habit and don't know how to fix it if it won't let you leave sketcher to pick a revolution center. You can save the sketch and re-open it if you do have to quit.

Creo Parametric Help Center To Define an Axis of Revolution

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

When making the sketch add the external axis as sketch reference. Then create a revolve centerline and align it to the axis reference. The revolve feature will now use that revolve centerline instead of any other construction centerline in the sketch.

Regards, Jan

View solution in original post

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

I always thought the feature was revolved around the first centreline you draw?

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

There is a work around to what you want.Hit revolve and go to sketch, create your axis and sketch half the section without mirroring. When you click ok it will say not solid (just hit ok) and will revolve a surface around that axis. At this point, you can click in the box (top left) and choose the external axis for the revolution. Then go back into your drawing and mirror the sketch. Once you hit ok you will have to change the feature from surface to solid and hit the checkmark to finish. Long process but it will get what you asked.

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

The only way I've found to do this is to remove the mirror axis from the sketch temporarily so that it can be selected as the revolve sketch and the external axis can be selected as the revolve axis. You can then go back and redefine your sketch to add the mirror axis and specify the symmetric constraints and/or re-mirror the geometry.

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

Based on your question, you made a sketch with a centerline in it.

You have an axis in your model.

You are making a revolve feature using the sketch (external to the feature) and you want to use the datum axis you created as the revolve centerline.

Create the revolve as you have been, when you have the sketch pre-selected or you select it in the feature, it assumes you want to use the centerline in the sketch (as you have discovered). Simple solution is to select the axis selection box (which by default says internal axis) and then select the axis you created. It will let you choose any axis to replace the internal centerline.


Steve Williams
Pro/E Version 15/16 (Circa 1995/1996)

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

If I've been able to recreate his problem, in Creo 2 M120 at least, the problem is Creo won't allow you to select the sketch if it has a geometry or construction centerline defined in the sketch. Creo also doesn't allow it to be pre-selected in my case. The sketch as I understood it is different than what you have shown, he used the centerline in the sketch to mirror geometry about it so he has a sketch with geometry symmetric about the internal centerline which causes the problem. This is what I understood to be the issue:

section.JPG

Sketch internal centerline removed to create revolve:

revolve no internal CL.JPG

Centerline re-added to revolve and geometry re-mirrored:

revolve with internal CL.JPG

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

This works for me:

Capture1.JPG

Gives me this:

Capture2.JPG

Is that what you need?

Re: How to mirror a sketch, and revolve it about a centerline EXTERNAL to the sketch?

That makes sense then. The devil is in the details. A work-around is then necessary.


Steve Williams
Pro/E Version 15/16 (Circa 1995/1996)