Inventor General Discussion

Inventor General Discussion

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stephenrottloff7259
Posts: 62
Registered: ‎01-05-2010
Message 11 of 17 (159 Views)

Re: Flaw in the way fillets are done?

03-25-2011 05:08 AM in reply to: tims79

I agree about adding fillets last.  It gives you the most flexibility.  But in your latest screen caps, it looks like your 2nd slot ends exactly where your 1st slot begins.  I think that is forcing the program to include geometry from the 1st slot into the fillet operation.

 

Try adding fillets as a secondary extrusion operation, or, modify your sketch to include the fillets, or, make your 2nd slot not end at the same exact point as your 1st slot.  Maybe one of these suggestions will get you by your issue.

 


Stephen R.

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Dennis_Jeffrey
Posts: 1,369
Registered: ‎12-15-2003
Message 12 of 17 (147 Views)

Re: Flaw in the way fillets are done?

03-25-2011 05:37 AM in reply to: tims79

If you add the slot as a new, separate machining operation, that top face is already flat. I think you are missing the point that others and myself stated about how would you do the machining. Working in 3D is a mathematical operation, not a mechanical one.

 

If the slot was created as the first machining operation, it would have that radius. A second path would then be required to make the top edge flat.

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tims79
Posts: 18
Registered: ‎06-04-2009
Message 13 of 17 (136 Views)

Re: Flaw in the way fillets are done?

03-25-2011 05:57 AM in reply to: Dennis_Jeffrey

I know, that is why I explained about adding the slot second, and what I feel is an error in how the fillet gets calculated.

 

In your previous response, you said Hint... it mimics the machining process.  You kept asking me how I would do the machining.  So I told you how it would be machined, now you are saying its a mathematical operation, not a mechanical one.  I think you are contradicting yourself.

 

I suppose it's not really an error, just the way the software works.  I will have to learn to live with it.

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JDMather
Posts: 28,259
Registered: ‎04-20-2006
Message 14 of 17 (130 Views)

Re: Flaw in the way fillets are done?

03-25-2011 06:07 AM in reply to: tims79

tims79 wrote:

 

I suppose it's not really an error, just the way the software works.  I will have to learn to live with it.


SolidWorks returns the same results.  Pro/E returns behavior you are after.

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jakefowler
Posts: 324
Registered: ‎12-14-2006
Message 15 of 17 (88 Views)

Re: Flaw in the way fillets are done?

03-25-2011 11:57 AM in reply to: tims79

Hi,

Thanks for submitting this case.

Unfortunately, this is one of those cases where a subjective decision has to be made by the modelling team over which solution to provide for an operation with multiple possibilities. When designing algorithms, we base these decisions on customer research and feedback, but unfortunately no one solution will suit every case.

I’ve spoken to the Fillet development team about this case, and they agree that we could do better here (an ideal might be to somehow provide a choice from both solutions). They asked for this case to be submitted as a defect so that this example can be examined further - machining technicalities aside, we would obviously still like to offer our users maximum freedom to explore shapes when creating their models. I've logged this as 1393252 in our defect tracking database.

Fortunately there are alternative workflows for your two examples to achieve the results you require; but if you encounter any models which can’t be worked-around, we would be very interesting in taking a look at these.

Thanks again for taking the time to submit this!

Jake



Jake Fowler
UX Designer
Fusion 360
Autodesk

Contributor
tims79
Posts: 18
Registered: ‎06-04-2009
Message 16 of 17 (79 Views)

Re: Flaw in the way fillets are done?

03-25-2011 12:21 PM in reply to: stephenrottloff7259

Jake

 

You’re welcome for submitting the issue, and thank you for looking into it.  Your response is completely satisfactory to me.  I can see how this is sort of a “you say potato, I say potahto” kind of thing. 

 

There are ways of getting around this one, so I don’t think I will run across one that can’t be worked-around.  But if I do, I will try to pass it on.  I think the idea of having the option for either solution is a great idea.

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scottmoyse
Posts: 1,702
Registered: ‎06-10-2009
Message 17 of 17 (54 Views)

Re: Flaw in the way fillets are done?

03-26-2011 02:41 AM in reply to: tims79

i get what you are saying fella, and fully agree with you. it is odd behaviour. It would annoy the hell out of me as well, especially since it doesn't show it in the preview. Its not only adding 'material' as you put it (even though an internal corner fillet does), it is creating a weird quirk.  easy to work around by shuffling the order features are created, but annoying nonetheless. You are choosing to fillet a selected edge, but INV is deciding to extend the fillet long another edge that hasn't been selected. i suppose its seeing it as a face to face fillet.

Cheers
Scott Moyse

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