topic Re: Can't loft and rail... in Fusion Design, Validate & Document Forum

Can't loft and rail...

Anonymous — Tue, 19 Dec 2017 23:42:05 GMT

Hi, I'm new to fusion360 and I am currently practicing modelling a knife. But, I can seem to loft between two different shapes using the rail. It either comes up with 'The Selected Rail does not touch all profile' or 'All profiles are point profiles. A loft needs at least one non-point profile.'

Help me please.

Re: Can't loft and rail...

jeff_strater — Tue, 19 Dec 2017 23:55:29 GMT

This is a post I did a while back on the basics of using rail curves with Loft: introduction-to-loft-using-rail-curves-in-fusion

There may be something in there that can help you. The key is to use Project -> Intersect when creating the rails, to assure intersection

Jeff

Re: Can't loft and rail...

Anonymous — Wed, 20 Dec 2017 00:24:49 GMT

Hi. Jeff, thanks for the quick reply. I did look through your tutorial before posting here.

I constructed the guide rails (shape of the knife) before creating the plane for it to loft.

The error pop-up as ... 'One or more rails intersects a profile more than once.' I've attached a screenshot of the intersection points...

I have tried it many times, starting a fresh but to no avail.

Re: Can't loft and rail...

Anonymous — Wed, 20 Dec 2017 00:28:54 GMT

If Fusion thinks both rails are the same line it will fail. Try turning off chaining?

Re: Can't loft and rail...

Anonymous — Wed, 20 Dec 2017 00:38:17 GMT

here's a public link to the file http://a360.co/2CGxOtM

Re: Can't loft and rail...

davebYYPCU — Wed, 20 Dec 2017 02:29:24 GMT

When you connect all the rails to the profiles, the error will disappear,

The straight rail between sketch 3 and 13, works ok, but there is this error at the sketch 3 to rail position.

Might help...

Re: Can't loft and rail...

Anonymous — Fri, 22 Dec 2017 17:21:22 GMT

Thanks for pointing that out!

I'm not sure how to fix it. Does anyone know the best way to create an object like that? Lofting with a curve?

Re: Can't loft and rail...

davebYYPCU — Sat, 23 Dec 2017 00:19:07 GMT

Easy to fix the problem, but you will need to edit the profile/s you want.

You projected Sketch 2, into sketch 3, but the curve in Sketch 1, did not align, not physically possible, without more work.

To fix it, I drew a new line from the projected point on the rail, to shorten the profile back to the curve.

The same sketch 1 curve in sketch 13, did not connect either, there were multiple lines in the sketch, so deleted those 3 lines and replaced it with one off the projected point.

So with the editing done, The loft is ugly with just the geometry you started with, and does not even comply to the rails, does it's best. Fisrt pic.

I had come up with a small fillet at the sharp point, Loft still didn't like it,

Try the extrude with smaller top lofted fillet, mirrored, and combined as an alternate technique. Pic 2.

File attached.

Re: Can't loft and rail...

alexmatthews3 — Wed, 31 May 2023 23:06:31 GMT

This is the stupidest work flow ever!!! I can see and select all the geometry but can't use tangent?? I used snapping and clicked directly on the profiles when drawing a "guide rail" line between the two profiles and still get the "selected rail does not touch all of the profiles" WTF!!!!!

Re: Can't loft and rail...

davebYYPCU — Wed, 31 May 2023 23:32:11 GMT

Sketch snapping - only works in this sketch.

Hide everything except the current sketch. What can you snap to?

If you hid the article, it needs to be projected into this sketch to snap to.

Difficult to put in words.

Re: Can't loft and rail...

TheCADWhisperer — Thu, 01 Jun 2023 09:16:25 GMT

@alexmatthews3

Can you File>Export your *.f3d file to your local drive and then Attach it here to a Reply?

Re: Can't loft and rail...

TrippyLighting — Thu, 01 Jun 2023 15:54:16 GMT

@alexmatthews3 wrote:

This is the stupidest work flow ever!!!

No, it isn't. This thread explains the workflow.

Re: Can't loft and rail...

alexmatthews3 — Thu, 01 Jun 2023 18:57:10 GMT

I managed using a different workflow. I'll figure out the loft tool when I
have more time. Thanks.