topic Betreff: Problem with loft in Inventor Forum

Problem with loft

roger — Fri, 24 Feb 2017 14:30:15 GMT

Inventor 2014 LT would not create the loft between the outer perimeters of sketch 8 and sketch 9. The preview looked perfect but it would not create the feature. Any idea why not? Thanks, Roger

Re: Problem with loft

I_Forge_KC — Fri, 24 Feb 2017 14:50:43 GMT

Hey Roger,

Lofts with a hollow section always cause headaches.

The solution is to do this as two lofts:

1) Loft the entire outer profile together as a join (when doing this, use the tree to select the sketch entities instead of the model)

2) Loft the inner profile as a cut

Your geometry is such that tangent/smooth on the cut will likely yield a problem. You might want to consider doing this as a shell instead of two lofts.

Re: Problem with loft

rdyson — Fri, 24 Feb 2017 14:56:16 GMT

In 2016, I was able to create the lofts as new bodies and then combine cut the two new ones and combine the results to the old body.

Betreff: Problem with loft

WHolzwarth — Fri, 24 Feb 2017 17:05:45 GMT

Here's my attempt (2014 IPT).

Walter

Betreff: Problem with loft

roger — Sat, 25 Feb 2017 14:42:23 GMT

That is exactly what I was hoping to get! Thanks! What was the trick?

Betreff: Problem with loft

WHolzwarth — Sat, 25 Feb 2017 14:59:08 GMT

Hi Roger,

trick was making the sections more similar to one another by splitting them at the symmetry plane.

As K. Cornett mentioned above, Inventor often has problems with lofting of internal regions together with outside regions. By Splitting internal regions became open, and more friendly against lofting. Transistions can be adjusted, and after that mirrored again.

Betreff: Problem with loft

roger — Sat, 25 Feb 2017 15:15:58 GMT

I see - the split, loft, and mirror combination. Thanks again, Roger