Having trouble specifying a rail for a loft

[paramax55]

I am trying to do a design for a yoke for a headset and the top part has a curved surface. Laughingcreek showed me a very good way to do it, but it uses techniques that I am not yet familiar with. I want to do something similar with lofts (this is a learning experience), but I'm not that good at it yet. I specified two profiles and that went well, but I am not able to pick the spline that I want to use to define the shape. Fusion tells me that the spline doesn't intersect all of the profiles, and the chain selection is not picking up the box that the spline intersects. The box is going to define another part a little later, so I'd like to retain the box. Do I just need to redo my spline? Is there a way to make Fusion 360 happy with what I have so far? Sweep tried to work, but my starting and ending shapes are different, so it's not a valid option (I don't think).

[g-andresen · Accepted solution]

Hi,

1. create a rail in a new sketch by projecting the necessary elements from sketch 1.

2. create intersections and smooth transitions

3. create loft

Screencast

günther

[jeff_strater · Accepted solution]

The error messages are accurate.  The rail you are trying to use is not tangent continuous, and needs to be.  So, editing the rail sketch and adding a tangent constraint fixes that problem.  You will note that I turned off chaining, because there is extra geometry in that rail sketch that you don't want to be automatically chained.

[paramax55]

You both were right, Thanks! Fusion was telling me what I needed but I just didn't have the right dictionary to understand what it was saying. It appears the whole key was to create tangency between my straight line and the spline. SIMPLE!