Not able to extrude certain sketch features

[chrisevrard]

Hey All,

I'm working on a new design and when I draw features in my sketch (circles in this case) some are a darker blue than the others. The darker blue features aren't available for Extrude later after finishing the sketch.

I have noticed that if I delete a line in the outline of the sketch, the darker blue circles will turn the same color as the ones that are working. but then I still cannot extrude what I want.

Also, if I sketch circles in the top half of the part outline they are darker blue. In the lower half of the outline they are the normal pale blue.

What is going on here?

Thanks,

CE 

file attached

[TrippyLighting · Accepted solution]

In the video I fix the two overlapping spline ends you've created. A good indication that something went wrong when creating the curves is when the curvature comb tool shows strong spikes, or nothing.

Those overlapping ends confused the code that is responsible for profile recognition.

Also, for these gentle curves, you need to use fewer spline control points and work with the tangent handles. I personally would probably use control point splines.

[davebYYPCU]

One for @jeff_strater to explain, as there is no history recorded for sketches.

Select Other - You have one sketch circle, and 2 profiles. 

So select to extrude the large profile, you have not got those 2 circles acting as holes, but the other 3 holes are selected correctly.

Do you remember how that sketch was built.

Delete then and replace those circles, does not fix the problem.

Might help....

[TrippyLighting]

@davebYYPCU I think you should read my post and watch the video. That explains everything you need to know 😉

[davebYYPCU]

I would if it was there before I replied, 

You musta seen this before, I was not looking to the outline, just the circles.

[TrippyLighting]

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@davebYYPCU wrote:

...

You musta seen this before, I was not looking to the outline, just the circles.

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When I see splines, the very first thing I check is the curvature. You are correct, I've seen similar things before.

I think the click behavior in Fusion 360's sketch engine is responsible for this. It  could use some fine tuning.

Or it's my mouse driver but I doubt that.

I don't see this in other CAD software I use.

[chrisevrard]

Okay, based on what you did I think I remember how I screwed that up now. Thank you!

Best,

CE

[g-andresen]

Hi,

I removed the post because the answer to it was already in @TrippyLighting  screencast.

günther