SVG Import Issue- Not an accurate form and DXF import not allowing extrude

[lukasdocuments]

Hi, 

I am trying to import a SVG or DXF file of a cycloidal gear into Fusion 360, using the Sketch, import SVG/DXF option. 

I have created the file and validated the profile in several programs including Inkscape and Illustrator. The issue, however, is that when I import the SVG into the sketch, the tooth profile isn't actually accurate. It appears to be missing the curve of the tooth. Does anyone know what the issue might be?

I then tried to do the same thing with a DXF file. Again, everything imports ok, but this time I cannot extrude the profile. I have checked that there aren't any open loops. 

Any help would be much appreciated. Thanks. 

[HughesTooling]

I think the problem might be the type of spline in the DXF.

Here's an example that shows there are gaps in the profile and there're quite random.

I have an export scheme for Rhino that works well with Fusion and just opening and saving from Rhino fixes the file. I've attached the Rhino export, it will be in mm let me know if you need in inches.

Mark

[lukasdocuments]

Thanks Mark, 

I saw your very clever solution in the "Leak in Sketch Geometry" thread. 

I also appreciate you sharing the exported Rhino file with me. I actually have many gears to do and the fact that a simple open-save in Rhino works gives me hope that I can find another solution in another software (I don't have Rhino).  

What I find strange is that I tried using the App that was developed to find gaps, but it told me the profile was closed... No matter how hard I look, I can't seem to find any. I had hoped the SVG would work, given that the DXF didn't. 

Will have to try and keep experimenting. I'll post a solution here if I find one. 

Lukas

[HughesTooling]

I ran your file through QCad and used convert straight splines to lines and it then open as a closed profile in Fusion

One problem is it converted the spline at the base of the tooth in to a line even though it's not quite straight. You other thing you could try is fixing just one tooth then extrude and make a circular pattern of the extrusion to make the gear

Mark

[HughesTooling]

Here's a short screencast demonstrating how to fix one tooth and use that in a pattern to create a gear.

Mark

[FrankCao]

Hi lukasdocuments,

Thanks for reporting the issue. We have noticed there are some regressions happening on svg import, especially on sketch profile building. Now we have internally fixed these kinds of profile building issues. Hopefully you will see the problem get fixed on future Fusion update. 

Thanks,

Frank

[HughesTooling]

@FrankCao Do you know if anyone is looking at the DXF file in the first post as there is something very strange. It shows as an open profile, does not shade but if you go to the Patch workspace and try and select a curve to extrude the whole profile selects as a closed chain. So to Fusion it's closed and open!

It will not extrude in the patch workspace, you get this odd error.

Mark

[FrankCao]

Hi HughesTooling,

Thanks for reminding me about the dxf profile build issue. I can still reproduce it here in our development build. Now I have internally logged FUS-25228 to track this problem. Our developer will take a look at this issue soon.

Thanks,

Frank