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russ
Posts: 11
Registered: ‎06-15-2011
Message 1 of 10 (321 Views)
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Cannot apply a face draft of any kind

321 Views, 9 Replies
04-26-2012 08:12 AM

Hello all,

 

I'm using Inventor Professional 2012.  I have what seems like a relatively simple part, but I cannot find any way to apply a face draft to the four quadrants between the upper outer and inner "'cylinders".  I get the dreaded "did not produce a meaningful result. Try with different inputs." no matter which type of draft I try.  I have created parting line drafts everywhere else.  Can anyone please tell me how I can get these faces to draft?  I'm also open to any suggestions on how to draw this better.

 

I've zipped up my IPT.  I appreciate any help at all.

 

-Russ

-Russ
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JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 2 of 10 (313 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 09:10 AM in reply to: russ

First thing I notice is that your Main Sketch is not fully constrained - missing 13 dimensions or constraints.

You might read this document http://home.pct.edu/~jmather/skillsusa%20university.pdf

 

Did you intend for these arcs to be tangent?

 

Sketch1.png

 

I think you can get most of the Face Draft in the first extrusion if you set it up correctly.

I'll try to post an example in a while.

Please mark this response as "Accept as Solution" if it answers your question.
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Contributor
russ
Posts: 11
Registered: ‎06-15-2011
Message 3 of 10 (302 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 10:02 AM in reply to: JDMather

Thanks for the reference to your excellent document.  I'll use it for sure.  Yes, I did intend tangency there.  I drew the upper arcs as circles (then later trimmed) but I could not manage to get the lower arcs tangent the way I wanted.

 

I have tended to ignore the missing constraings sometimes because it adds dimensions that seem irrelevant to me (like lenghts of construction lines), clogging up the drawing.  Your comments indicate that's wrong, and I need to seek fully constrained sketches.

 

I look forward to your example, because all those separate face drafts seemed like they should be unnecessary.

 

-Russ

-Russ
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JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 4 of 10 (295 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 10:43 AM in reply to: russ

russ wrote:

...clogging up the drawing. 

 

 -Russ



Edit my sketches (see attached) they don't look clogged up to me?

 

My sketch is fully constrained.

 

Complexity.png

Please mark this response as "Accept as Solution" if it answers your question.
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Contributor
russ
Posts: 11
Registered: ‎06-15-2011
Message 5 of 10 (287 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 11:31 AM in reply to: JDMather

Wow!  All I can say is "man, you're good!"  :smileyhappy:  I'm looking over your drawing and saying things like "You can do that?" and "I never would have thought of that!"  Extruding with a taper and mirroring it is so much simpler than a parting line draft.  Plus, I can add fillets to all the edges, something I couldn't do with my drawing no matter how hard I tried.  But I don't think I understand the purpose of the Replace Face at the end.

 

I cannot thank you enough, especially for demonstrating how elegant Inventor can be when used correctly.

 

-Russ

-Russ
*Expert Elite*
JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 6 of 10 (283 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 11:45 AM in reply to: russ

russ wrote:

  But I don't think I understand the purpose of the Replace Face at the end.

 -Russ


Drag the red End of Part marker at the bottom of the feature tree to just above the Replace Face feature.

Examine the bottom of the part.  Notice that there is a draft angle on the bottom.  I assumed you wanted this face to be flat.  The Replace Face accomplishes this.  If you do not want it flat then delete the Replace Face feature.

Please mark this response as "Accept as Solution" if it answers your question.
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Contributor
russ
Posts: 11
Registered: ‎06-15-2011
Message 7 of 10 (280 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 11:52 AM in reply to: JDMather

I suspected that was the purpose.  I would indeed prefer the bottom to be flat, but I'm pretty sure the injection molding folks are going to require a face draft of at least 1/2 degree anyway.

Again, thank you so much for the lesson on doing it right.  I'll be referring to that sketch often, I'm sure.

 

-Russ

-Russ
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JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 8 of 10 (274 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 12:11 PM in reply to: russ

russ wrote:

 the injection molding folks are going to require a face draft of at least 1/2 degree anyway.


See attached if different draft on the bottom than rest of part - otherwise just change the original DraftAngle variable.

Please mark this response as "Accept as Solution" if it answers your question.
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Contributor
russ
Posts: 11
Registered: ‎06-15-2011
Message 9 of 10 (264 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 01:54 PM in reply to: JDMather

Thanks so much for the follow-up.

 

I'm staring at your sketch, and you've somehow managed to describe a pretty complex shape with just seven dimensions (and lots of constraints)!  I don't know how you did it.  For example, you have constrained the two middle circles to the proper offsets without dimensioning them.  I don't understand how that's possible.  I'm feeling pretty ignorant.  :smileyfrustrated:

 

-Russ

-Russ
*Expert Elite*
JDMather
Posts: 26,186
Registered: ‎04-20-2006
Message 10 of 10 (259 Views)

Re: Cannot apply a face draft of any kind

04-26-2012 03:28 PM in reply to: russ

Actually if I were doing it over again I think I could improve a bit more.
Edit the sketch and right click and select Show all Constraints.

You will see a bunch of equal (=) constraints that I used on small construction lines.

I will try to attach an improved example tomorrow.

Please mark this response as "Accept as Solution" if it answers your question.
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