I have a part that I'm trying to loft using 3d sketches for the rails will this work? Everything is fine till I try to add the rails, As you can see the loft works with out the rails.
Thanks for looking
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Your rail curves are not smooth (tangent) as indicated by the error message.
Therefore either add appropriate fillets or do a spline if that gets your design intent
if your design intent is straight lines as you have your rails - then simply do two lofts.
At the intersections of the lines in your 3D sketch. (Bends in 3D sketch)
But actually - I almost never ever create a 3D sketch as you have.
Nearly all of my 3D sketches are a result of Intersection Curve of 2D sketches.
Much easier to control and edit.
So, I would have had a Front and Side (in your case) 2D sketches with fillet constrained in one or the other (depending on design intent) to Sketch8, then found the 3D intersecting curve.
Yours is a simpler case of the 3D sketch in the Vacuum tutorial in my signature.