Tangent not working?

[Art5]

Have a sketch that I made by projecting the outline of a body. I've drawn a line that I would like to make tangent to two arcs in the sketch. For some reason, when I try to do this Fusion gives me an error. I know that Fusion still doesn't support tangent to spline despite this being a common feature in pretty much every CAD system I've used, but these are arcs, not splines, so I'm not understanding why I can't constrain this line. I've attached a dxf of the sketch, should be fairly clear what I'm trying to do but if not I'm happy to clarify further. Perhaps I'm doing something wrong?

As always, any and all help is greatly appreciated.

Thanks in advance,

Art

[TheCADWhisperer]

@Art5 

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

[TheCADWhisperer]

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@Art5 wrote:

Have a sketch that I made by projecting the outline of a body.
…but these are arcs, not splines, 

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Can you Dimension or Measure as Radii?

[Art5]

I was able to recreate the issue with the dxf I posted, but if you want it in a fusion format, here ya go!

[Art5]

Yes, I was able to measure and dimension them as radii

[TheCADWhisperer]

@Art5 

Is there a logical reason that you do not have Capture Design History enabled?

[Art5]

I removed it prior to export. I work in a prototype tool shop, the part is proprietary, non-disclosures and whatnot. All I've done at this point is create my 'UCS', create the sketch, project the body, and create the line, so you aren't missing much.

[HughesTooling · Accepted solution]

There is a problem spline causing a loop here. If I window the point inside the circle I can select and delete the problem spline then add the tangent constraints.

See attached file.

[HughesTooling]

Double checking and it seems the problem is actually a very short elliptical curve. If I move the spline below the arc this elliptical curve becomes visible. I guess this elliptical curve is causing a conflict the sketch solver can't solve.

[Art5]

Thanks, Mark!