Inventor Loft problem Inventor Loft problem Artois (Mechanical) (OP) 29 Aug 13 09:33 Hiya - need urgent help on the attached file. Basically i need to loft the two halves of the circle & the ellipse, while following the R175 circle as a guide/rail. really struggling anybody have an idea?? RE: Inventor Loft problem rollupswx (Mechanical) 29 Aug 13 17:26 You are in the wrong forum - this is the AutoCAD forum, not the Inventor forum. You do not have an R175 guide rail in the file - only a construction arc. If you edit Sketch1 and change the R175 to normal linetype rather than construction - it works fine for a Loft Rail.