Sometimes cannot create Tangent Line to Circle

[mandicreally]

I don't know what is happening but every once in a while Fusion just decides that I cannot make a Tangent Line to a Circle. 

In the attached Screen Recording you can see what I mean. I create a circle (even though "Auto Project Edges On Reference" is enabled in preferences). I can draw a line to the inner circle and the Tangent pops up and snaps as expected. But the outer circle, it just never happens on the one side.

This is a design technique I use very often, and I cannot figure out why just randomly it doesn't work. Sometimes I have to draw the circle manually (despite the edge being included in the sketch) and that will do it. But sometimes it still doesn't (as in the screen recording). 

It has become a much more common occurrence this week, for inexplicable reasons.

[laughingcreek]

hard to say. this generally works for me. can you post a model where this is happening so we can try? may be inherent to your modeling technique

[etfrench]

What happens when you start the line on the circle?

[TheCADWhisperer]

@mandicreally 

Click hold drag from the circle to the endpoint.

[mandicreally]

Color me ignorant, how does one find the Tangent point when starting from the Circle? All I can do is start a Line at a random point and go to the Point I'm trying to. It does nothing to find the Tangent Point on the circle. Maybe something isn't working so that's why? 

[TheCADWhisperer]

@mandicreally 

Click hold drag.

Works in Fusion 360.

Works in Autodesk Inventor Professional.

Works in SolidWorks.

[mandicreally]

Project file is attached here. My Modeling technique is best described as "haphazard". That said, I don't do anything differently when it doesn't behave versus when it does. Heck this exact project it behaved how I expected on one iteration then when I went back to make a change it suddenly wasn't behaving. (I had to cut the "boss" that the hole I showed is part of, off of the model and relocate it. This project is an extra mess as I'm iterating on a real world design for something that the creator has not provided CAD files for, so it is trial and error to get things right.)

[mandicreally]

It isn't working for what I'm trying to achieve. When I click hold and drag from the Point to the Circle it creates an arc. When I try from the circle, I just get a line without any Tangent. So if that is SUPPOSED to create a Tangent Line, it isn't. So something is inherently wrong with how Fusion is behaving.

Yep, I just tried it from the inner circle that IS behaving, and I see what is supposed to happen. THAT makes sense, but is still NOT working on the outer circle for no apparent reason. It just does not function the same way on that geometry.

[TheCADWhisperer]

@mandicreally 

Are all of your sketches fully defined (especially Sketch1)?

Are there any unresolved issues highlighted on your Timeline if you run Ctrl b?

Is the sketch you show in the video actually in the file that you Attached?

If yes, what is the sketch number?

[laughingcreek]

I was able to replicate what your seeing on your model.  may be a bug related to having auto project on reference turned on.  I (and I would guess most of the experienced users here) keep that setting off, preferring to explicitly project just the geometry I want.  That's the reason I never see this in my own workflow. 

what I observed.

with auto project on reference turned on-

-I could get the second point to be coincident to the edge, and then apply a tangent constraint after.

-if I project the edge manually, and then turn off the body, then the tangent constraint will apply during the second point placement as expected.

@Phil.E ?

[Phil.E]

I can confirm it. Without Auto Project on Reference, Fusion provides the sketch profile on the face you sketch upon. That profile seems friendlier to the tangent constraint than the projected edge curves. FUS-147856