Loft to a curved surface

[Doubletop_]

I have  spend many hours now trying to model this simple item and loft the curve at the base of the chimney to the curve of the boiler barrel . I've drawn the boiler surface and projected  the 3.25" circle onto it. A seperate sketch provides the reference to the lower 2.25" base of the chimney, just above the 7/16" fillet. The loft pics up the base of the chimney  but won't select the projected curve on the boiler barrel. No dound there is a simple solution to this but I can't fimd it I'm afraid.

[davebYYPCU]

Surface > Patch the larger projected circle, hide the sketch and use the patch outline for a Surface > Loft.

Might help....

[mango.freund]

https://www.youtube.com/c/Fusion360School

[g-andresen]

Hi,

Please share the file.

File > export > save as f3d on local drive  > attach it to the next post.

günther

[g-andresen]

Hi,

try this

günther

[TheCADWhisperer]

The Attached might give some ideas...

[TrippyLighting]

Here is another version:

 

[Doubletop_]

Thanks for your prompt assistance. I see that you have all used the surface loft. Trying that works for me as well although I'm still aving problems geting the rails to intersect with the projected geometry, so I'm working on that.

The problem is I need the resulting loft to be solid and joined to the chimney itself, hopefully with the bore as well. However making the chimney solid, with the loft, and the putting the bore through later wouldn't be a major problem. I've attached my .f3d file.

[davebYYPCU]

Surfaces are easier, but solids are just as ok, when you follow the rules, Loft is not so forgiving.  (I see you don't follow Rule 1)

Loft can not do solid donut profiles, so yes you make it totally solid and bore the holes separately.

Step along my timeline, eyeballs where needed.

edited:  File updated to join the flange to the chimney as mentioned.  I don't know whether the bolt holes are to be perpendicular to the flange, but probably are.

Might help....

[TheCADWhisperer]

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@Doubletop_ wrote:

Thanks for your prompt assistance. I see that you have all used the surface loft. 

The problem is I need the resulting loft to be solid and joined to the chimney itself, …

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Stitch.

[TheCADWhisperer]

See Attached.

[TrippyLighting]

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@davebYYPCU wrote:

Surfaces are easier, but solids are just as ok, when you follow the rules

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Sometimes, but often these circumferential lofts are not symmetrical when they should be.

[Doubletop_]

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@davebYYPCU wrote:

Surfaces are easier, but solids are just as ok, when you follow the rules, Loft is not so forgiving.  (I see you don't follow Rule 1)

Might help....

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Thanks - I don't follow rule #1 as I probably don't know what it is?

[Doubletop_]

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@TheCADWhisperer wrote:

See Attached.

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Thanks for this I'll take a detailed look at this tomorrow as it is getting late here

[davebYYPCU]

It's not hard to find, is good advise how to set up the design, has exceptions.

Component first then parts for it fall into the folder.

One Component for each real world part.

Might help....

[Doubletop_]

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@davebYYPCU wrote:

It's not hard to find, is good advise how to set up the design, has exceptions.

Component first then parts for it fall into the folder.

One Component for each real world part.

Might help....

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Found it https://forums.autodesk.com/t5/fusion-360-design-validate/fusion-360-r-u-l-e-1-and-2/td-p/6581749

I've been creating components but for some reason any later actions on that component don't fall into the associetd components folder. Which makes for a messy timeline which I have been wondering about.  So the trick seems to be the activation.

I just did a quick test and it seems to work but did appear to leave the original sketch orphaned outside of the component folder. I'll take a look at the tutorial in the post.

Thanks for the heads up

[TheCADWhisperer]

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@Doubletop_ wrote:

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Thanks for this I'll take a detailed look at this tomorrow as it is getting late here

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I made a slight change - see Attached.

Moved the radius to inside circle and offset to the outside for the metal thickness.

[Doubletop_]

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@TheCADWhisperer wrote:

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@Doubletop_ wrote:

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Thanks for this I'll take a detailed look at this tomorrow as it is getting late here

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I made a slight change - see Attached.

Moved the radius to inside circle and offset to the outside for the metal thickness.

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Thanks for this.

There is something I'm  still missing because every time I try to replicate what you've done I get a different result. In the end I copied your example and used that. So thanks again.

I watched the RULE #1 tutorial a number of times, I had to download it and play it slowly as the tutor flys through it  with the mouse pointer all over the place. Again I'm missing some base principle because subsequent actions on a component don't seem to end up in the component folder. Eve when the component is activated.

I'll press on though as the eureka moment will come eventually.

[TheCADWhisperer]

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@Doubletop_ wrote:

There is something I'm  still missing because every time I try to replicate what you've done I get a different result. 

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@Doubletop_ 

When something doesn't work as expected you should Attach your new file here - that is how new techniques are most efficiently learned.

[TrippyLighting]

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@Doubletop_ wrote:

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So the trick seems to be the activation.

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Obviously, as the rule states right in the first sentence "...and make sure it is activated" 😉