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Extrude - zero distance error

Anonymous
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11 Replies
Message 1 of 12

Extrude - zero distance error

Anonymous
Not applicable

Hi everybody,

I came across an error that I haven't seen before but experienced with more than one project.

When I try to extrude a sketch starting from an object and to another object that's between the plane of first object and the sketch I get a zero distance error even though the distance is not zero and it's correctly show in preview. This error only happens when I select from an object to an object. If I select distance then it works correctly. Before someone tries to tell me not to extrude backwards I need to do this to create tapered stand-offs where the top of the stand-off is a known size.

Attached picture might help.

Thanks!

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Accepted solutions (1)
1,315 Views
11 Replies
Replies (11)
Message 2 of 12

g-andresen
Consultant
Consultant

Hi,

please show your process in a screencast to make it  more clear what happens.

 

günther

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Message 3 of 12

mickey.wakefield
Autodesk
Autodesk

Hi Tref-Het -

 

I've tried to duplicate what I think you are describing, but I get no errors. Can you create a screencast or video, please?

 

I believe that error can also occur when you create geometries that have a thickness of zero - but I am not sure. (think two corners that just touch one another at the line on their edges.)



Mickey Wakefield
Fusion 360 Community Manager
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Message 4 of 12

Anonymous
Not applicable

I managed to record a screencast.

There are 4 stand-offs. If I extrude them one by one there is no error. If I try to extrude them all 4 at the same time I get "tool body creation failed" error claiming that there is an intersection problem. If I select the bottom surface to extrude to then I get a zero distance error when It clearly shows the distance as 3.6 mm. It probably trips out on the fact that the plane the sketch is on is the same plane the surface it needs to extrude to is on. However it shouldn't be a problem as the extruding distance is not zero.

I hope this makes sense!

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Message 5 of 12

TheCADWhisperer
Consultant
Consultant

Why do the From Object in this Extrude?

Just do the To Object.

 

or

Reverse the From - To selections.

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

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Message 6 of 12

Anonymous
Not applicable

The why is in my first post and it's irrelevant. This should still work. It is possible that my mistake somewhere is causing this but I couldn't find it.

I attached the .f3d file.

Thanks to all trying to help!

 

Edit: And of course I forgot to attach the file.....

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Message 7 of 12

TheCADWhisperer
Consultant
Consultant

@Anonymous wrote:

The why is in my first post.....


Must be aggravating when people don't read the problem description. 😮

I guess you will have to go with Face Draft.  (See Attached)

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Message 8 of 12

jeff_strater
Community Manager
Community Manager
Accepted solution

agreed that this should work.  I created FUS-70507 to track this.  The workaround, you already discovered, is to do the extrude in more than one feature.


Jeff Strater
Engineering Director
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Message 9 of 12

mickey.wakefield
Autodesk
Autodesk

Thanks for this, and for the model. I watched it, played with it a bunch, and can confirm what you see. The model itself seems a bit strange to me....the sketch you work with here blinks on and off in my graphics window. This is not normal behavior for my machine. I was thinking that there might be some issue with this particular model.

I tried to figure out how the model was built. I was not able to figure out all the steps - but I could find no reason for the sketches to be flickering and no obvious corruption of the file.

 

As a last test - I built a small test file, very similar to yours using just a few basic sketches. In this file - the same issue was present. I can create a singular element, but multiple elements do not work. So there does indeed appear to be some underlying issue.

 

As a side note - I was able to create 2 elements in your model at once, but not 3 or 4. In my model, I was unable to create more than one. I don't know if this has any relevance for the issue, but just in case, I thought I'd mention it.

 

Thanks for your help in tracking this down. Hopefully we can eventually get it figured out and fixed. I hope the workaround is OK for now....



Mickey Wakefield
Fusion 360 Community Manager
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Message 10 of 12

Anonymous
Not applicable

Thanks to all of you who tried to help!

I can work around the issue. It's not a huge deal, more like an annoyance. Extruding from the bottom up and using face draft is an easy substitute as @TheCADWhisperer mentioned.

I built the model with only a hazy idea what it was going to look like so some steps might not make sense as I was figuring it out on the go. Also I'm not a professional CAD designer however I did start drawing about 25 years ago with AutoCAD R12...

I don't have the sketch flickering issue on either of my machines. Yours might not like my smell or something... 🙂

I'm glad that you were able to replicate the issue with a different model. It makes me feel a bit less stupid. Thank you for the effort!

And thanks @jeff_strater for elevating the issue!

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Message 11 of 12

mickey.wakefield
Autodesk
Autodesk
One other thing:
You might wish to consider (in general) not doing all four of these elements in a single sketch. You could also just do one (and only have one sketched circle) - and then just pattern the bodies that are created (or the feature).
This is because sketches are resource-intensive. Having simple sketches will improve performance of the software a lot. So, a simple sketch, and a pattern of the bodies created by that sketch, is a lot better than a sketch with many elements that creates several bodies in one go.
In this case - the sketch is not at all complicated. I don't envision any kinds of problems - but its best practice, so I thought I'd let you know.
On the other hand - the FIRST sketch in the part IS quite complicated. Breaking this up - if possible - would probably be a good idea. Its not critical in this case though.
Oh - and to be clear - what I am talking about here has nothing to do with the issue you found. Its just additional info for you.


Mickey Wakefield
Fusion 360 Community Manager
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Message 12 of 12

Anonymous
Not applicable

I appreciate your tip! This is the kind of thing that you would not know unless you know the inner workings of the software or figure it out by experience. Neither I have with Fusion...

One reason why I like doing sketches is that it's easy to check / change dimensions. They are all there, easy to read and change. If you create one object and copy it then you need to find the exact feature that copied that exact object, open it, check the distance and change if necessary. This issue might be irrelevant if you know what you're doing... 🙂

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