"rail is not smooth" means that you need a tangent constraint between curves in your rail. Rails are required to be tangent continuous.
"rail does not intersect all profiles" means that there is a gap between your rail curve(s) and one or more profiles. Each rail must intersect each profile exactly. Usually, you would use Project->Intersect to guarantee that there is a point in the rail curve sketch that precisely intersects the profiles.
@artisticdirection wrote:
... Some of my sketches are made from DXF files. Is this my problem? S...
yep. rule of thumb. always draw native fusion curves for any surfacing work. any type of imported curve has a HIIIIIGH probability of having some kind of issue that will prevent tools from working.
examining the edge where the loft tool says the rail needs to be tangent continuous you will find that the edge is indeed not tangent continuous.
@artisticdirection wrote:Thank you. I prefer to create my 2D drawings in Illustrator, then import dxf to Fusion. Frustrating that Fusion continues to have this issue.
The issue is not with Fusion.
The issue is the Illustrator geometry is rubbish. (Although not so bad in this case - could probably be fixed in Fusion with a little effort. But it is so simple - it would be far easier to create correctly from scratch in Fusion.)
Why are there two lines when one would suffice? (same with arcs/curves)
Where are your dimensions?
Work with symmetry about the Origin.
Where are your Tangent Constraints? (Not enough to be tangent - must also have Tangent Constraints to keep it that way.
Tip: The most powerful tip in all of parametric modeling (in any parametric MCAD software) - click and drag sketch geometry. It should be entirely predictable...
...not result in a mess.
Are these points supposed to be symmetrical?
Would you like to learn how to do this correctly?
Q1. Have you ever cut a piece of wood on table saw? If yes, what is the first thing you do?
Q2. What measuring instrument will you use to measure these dimensions?
Welcome to the real world!
If you want stuff to work in Fusion 360, then create native sketches from scratch in Fusion 360.
Precision for the purpose of creating physical artifacts it the main purpose of CAD systems.
"I'm not sure why Fusion has to take a very simple vector drawing and turn it into strange line segments, because that's not how I drew it"
I'm not sure that this is Fusion making the change. It is, in fact, likely that it is Illustrator which is exporting things as DXF and turning it into "strange line segments".
"because the neck fits precisely into a neck pocket in the guitar body"
This precision is exactly why you should be using native Fusion geometry. I am not an AI expert, but I suspect that AI does not support geometry constraints and associative dimensions. I assume that AI does not have a tangent constraint between curves, for instance. You will want that tangency for any downstream modeling (such as fillets, or even CNC programming).
You can certainly use DXF or SVG geometry with Fusion, but I think what people here are telling you is: Others have experienced lots of pain when importing geometry into any CAD system (this is not a Fusion-only issue). You can deal with that pain, certainly, if you prefer using AI for geometry creation.
I, too, would be interested in what Rhino does with this same geometry.
@artisticdirection wrote:... fits precisely...
I have created a video on getting started creating absolutely precise geometry.
I wait for your affirmative signal that you want to learn how to do this correctly with parametric geometry.
We can then walk through step-by-step each portion of the geometry once I get your go-ahead approval.
All geometry will be fully defined, easy to edit and logically predictable.
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