topic Re: sketch strange behavior in Fusion Design, Validate & Document Forum

sketch strange behavior

kroteg304 — Thu, 13 Aug 2020 12:38:59 GMT

Re: sketch strange behavior

TheCADWhisperer — Thu, 13 Aug 2020 12:49:25 GMT

Do I see white dots? (Not good!)

Do I see blue lines? (Not good!)

Do I see asymmetry where I would expect to see aesthetically pleasing symmetry?

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

Re: sketch strange behavior

laughingcreek — Thu, 13 Aug 2020 14:57:58 GMT

pretty sure this is a profile tracking bug. I think it's related to the arc here-

@jeff_strater , @Phil.E -wasn't there something like this reported a little while back?

Re: sketch strange behavior

kroteg304 — Thu, 13 Aug 2020 15:15:11 GMT

https://drive.google.com/file/d/1xxebFxRxoRf9a2MR64_WYsm-LozFmOWU/view?usp=sharing

Re: sketch strange behavior

TheCADWhisperer — Thu, 13 Aug 2020 15:21:06 GMT

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

Re: sketch strange behavior

kroteg304 — Thu, 13 Aug 2020 15:27:35 GMT

😃

Re: sketch strange behavior

TheCADWhisperer — Thu, 13 Aug 2020 15:28:27 GMT

@laughingcreek wrote:
@jeff_strater , @Phil.E -wasn't there something like this reported a little while back?

https://forums.autodesk.com/t5/fusion-360-support/strange-extrusion-behavior-objects-faces-missing-on-compute/m-p/9679521#M96838

Re: sketch strange behavior

TheCADWhisperer — Thu, 13 Aug 2020 15:46:27 GMT

@kroteg304

What is the diameter of your circle?

Is there a logical reason that it is not dimensioned?

Why do you have this extra line in this side, but in no other locations (except the double mirror)?

Are there any unresolved issues highlighted in yellow in your Timeline?

I am trying to determine if the Design Intent is for symmetry about this line?

Many of your sketches are not fully defined which makes it difficult for me to determine your true Design Intent.

I suspect that this geometry would be more efficiently created with a Pattern, Rib or Web.

Re: sketch strange behavior

kroteg304 — Thu, 13 Aug 2020 15:59:58 GMT

The circle repeats the diameter of the "gore".
Lines were drawn on the circle in the form of a curved grid. Then the extra lines were cut off.
The protruding lines could not be cut off.

Re: sketch strange behavior

TheCADWhisperer — Thu, 13 Aug 2020 20:15:37 GMT

@kroteg304 wrote:
The protruding lines could not be cut off.

You should fully constrain each and every sketch for robust and predictable results.

You should immediately stop and ask questions if you cannot fully define a sketch.

I suspect that something like one of the two examples is the technique that you should have used (the outside ring can be easily removed if you don't really want it (like in your original))

Re: sketch strange behavior

Phil.E — Tue, 18 Aug 2020 20:52:53 GMT

@laughingcreek Yes it is similar. Good catch. Always helps to have more than one example.

Re: sketch strange behavior

Phil.E — Thu, 03 Sep 2020 21:29:07 GMT

Your model has a spline that is drawn around a profile. Splines do not perfectly fit curves, and this is causing some confusion in the way profiles are tracked.

The red part is a closed profile with a tiny areaThe dark blue ring is a spline drawn around an existing sketch edge

Re: sketch strange behavior

laughingcreek — Thu, 03 Sep 2020 22:18:04 GMT

@Phil.E - another example of having fusion project invisible lines when a sketch is created on a face the default setting causing confusion.

but hey, less clutter, right?