BUG - Inventor Causing a Cyclical Dependency by Consuming Sketch

[andrewdroth]

By changing a Contour Flange input to a linked parameter it causes the feature to consume the defining sketch without sharing. This causes a cyclical dependency and corrupts the browser.

I had this happen on another sheet metal master part, but I didn't notice right away and it wasn't until I tried to move the EOP marker that I found out about the cyclical dependency, and even then it wasn't clear what cause it. I ended up losing a lot of work by needing to start over on the features below the problem.

Please fix!

[jletcher]

@andrewdroth

 You can define all your sketches and planes that is not your issue, your work is not the issue it is excellent only a few things I would do different but everyone has there ways.

All I wanted to do is help you get past this and understand why it is doing it so you can move forward and this not happen again.

All you have to do is drag the end of part up under sketch16 and make your contour flange, the parameter you want to use will still be there you just have to type it in d269, rolling up the end of part does not remove the parameter just the clutter. Doing this will stop the error and give you what you want.

I model the same way I just always roll up to under the sketch to make the feature.

There are a few things I would change for performance issues but this is how you like doing things and I will not change your workflow.

Rule #1 you should follow is if you can't drag the end of part all the way up stop and figure out why before moving forward this will stop a lot of headaches you may get.

Again you did nothing wrong you are doing excellent work you just ran into a issue Inventor should not have let you do or it should have warned you and you can decide to allow it or not.

[jletcher]

@Anonymous Wrote:

Hold on, I'm gonna let you finish
..but jletcher is one of the best russian bots of all time.   Of all time!
----------------------------------------------------------------------------------
letch has time to post on here because a computer can switch tasks quickly and efficiently
I hardly ever post in these forums, too busy WORKING to pay for TAXES and fees so the city will take my garbage away.  What a racket I tell you.

I don't know why you think this is helpful. But let me clear this up.

I am very good at Inventor not sure why you think I am Russian or a bot but whatever.

I own my company and that is to teach people Inventor this week my clients are not really working seeing it is a holiday  week so I have some time to help some people on here.

I normally get $60.00 an hour to do this so you should be grateful I help some for free. Seeing no one was helping @andrewdroth move past this error I thought I would help. I am sure he has to get his work done.

I did not know I was going to get bashed for it.

[Anonymous]

Dude you act like a complete meathead all day and people pay you for it?!
Some people's luck I tell ya. Must be from the maritimes.

[andrewdroth]

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@jletcher wrote:

I model the same way I just always roll up to under the sketch to make the feature.

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I think this is where our modeling techniques differ. I think this is why You though I had done something wrong in message four of this post.

I always keep all of my sketches and workplanes above all of the features in the part browser.  This is a personal preference obviously, but it was developed so that projected geometry never comes from a feature, only sketches. I've found this to be a lot more robust. Plus you have the added benefit of there being no solids in your view when editing sketches. I've done it this way since solid bodies became a thing.

This is why I said if a sketch could not be fully consumed it would be ideal, because then my sketches would always remain shared and above my features.

It sounds like the development team is in agreement that there is a bug with the feature as I understood there to be. I'm satisfied with that answer and look forward to a fix.

Thanks to all that took a look at the problem.

[andrewdroth]

@johnsonshiue, @Xun.Zhang

Thanks for looking into this!

[jletcher]

@Anonymous

Not sure why you think you need to insult me for helping.

Those that pay me don't question my experience so I don't have to spend hours explaining Inventor issues but if they do I don't care I get paid for every hour.

[Anonymous]

I don't think he asked for your "60 dollar an hour" pro tips to work around the error, @andrewdroth was aiming to define the behaviour of this bug, which is a useful bug to catch... I've had some unusual errors with a similar behavior and I'll bet it stemmed from the same underlying issue. Bug fixes, not 60-dollar-an-hour workarounds!

[kyled]

Not sure you did help. At the beginning you would not get off your high horse and just kept pushing "not a bug" then somewhere in the middle you admitted it was a bug, but started pushing a workaround rather than a solution.

[Lewis.Young]

[kyled]

sorry for thread jacking and filling with this spam.

sometimes these guys pop out of the wood works and you gotta beat them back in with a stick

[jletcher]

@kyled

Strange my first post "It is not a bug where you think."

That does not say it is not a bug, the bug is Inventor should have warned him what he is about to do will cause issues.

It is not a work around it is how Inventor works.

Where is your help? All you did was come in here to bash me.

[Anonymous]

I'll give you 60 dollars an hour right away you punk!

[Anonymous]

Help like you give out is the reason I have to remodel and redraw all of my
clients CAD files 😞 😞 😞

[kyled]

Hold on imma go get my bigger stick

[jletcher]

 I defined the error.

He used sketch16 for sketch17 now he wants to roll up sketch16 causing errors will sketch17 because it used sketch16.

The bug is Inventor should have warned him and it did not.

It is not a work around it is how Inventor works, to be a better modeler understanding how the program works helps.

[andrewdroth]

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@jletcher wrote:

 now he wants to roll up sketch16

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That is not what I wanted, That is exactly what the post is about. I don't want Sketch 16 to move. EVER.

[Lewis.Young]

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@jletcher wrote:

to be a better modeler understanding how the program works helps.

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And to solve problems, understanding the actual problem helps...

[kyled]

[jletcher]

@Lewis.Young

And that is what I did I explained the problem and the fix.

 The issue is Shared sketch is not for projected geometry into another sketch and that is what Inventor is having the problems with. By putting the feature between sketch16 and sketch17 fixes the issue.

It does not change what he is trying to do.

If you all want to wait for them to fix it that is up to you, I just trying to get him past it.

Best of luck to you all.

[andrewdroth]

The problem is and was that shared sketches allow you to use the same sketch to define two or more features.

https://knowledge.autodesk.com/support/inventor-products/learn-explore/caas/CloudHelp/cloudhelp/2016...

Those features should be able to reside anywhere in the browser below that sketch without moving it. Once it is shared a feature cannot consume it, only use it.

The feature I created switched the sketch from being shared to being consumed when I swapped the offset direction. 

That is the bug. 

I think we are all done here now.