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.

[Doubletop_]

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@TrippyLighting wrote:

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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" 😉

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Although I still have to reconcile the basics. For example the base drawing for a new components appears to reside outside of the file structure for the component.

In the project sketches folder. When the component is activated any reference to other components, which are now deactivated, and cant be used.  When I was doing the loft the sketch for projected dimension ended up in the dummy boiler folder.

I know you will all be telling me I've got it wrong, because clearly I have. As I said I need to work on reconciling the basics so I'm in tune with the Fusion 360 paradigm. Something you will all do naturally and  cant understand how anybody can get it wrong. I do the same with any app I'm au fait with.

I'll keep working on it and get there.

Thanks for your help.

[Doubletop_]

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@TheCADWhisperer wrote:

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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.

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I'm trying not to be greedy with your support. It would be too easy to  get you to do my homework. I think the problem is partly the subtleties in Fusion 360.  For example, in your solution you had drawn a circle, I thought it was was a rail, whereas I later realised it gave the correct separation between the chimney and the boiler.

Then I wondered how you managed to get the selection of Tangent (G1) in the profiles. I then found that is controlled by the selection at the bottom of the window "Tangent Edges" (unsurprisingly)

Then you get a "Join" option in the "Operation" window, which I didn't. 

There are subtletities in how you get to these options which would be second nature to the experienced but not to novices who aren't fully conversant with all the toys in the box and how they interact.

As I said in my previous post I'll get there and I'm thankful for all your help.

( as an aside I'm here as I am into model engineering. 12 years ago I had no idea where to start. I did my apprenticeship on forums like these. Four locomotives, three I/C engines and various other projects later I sort of know what I'm doing now.)

[TrippyLighting]

As @TheCADWhisperer has already mentioned, please share your model.

This does not mean that we'd be doing your homework, BTW. Although, initially this might have looked like a simple task, lofting can be quite tricky and you've already misinterpreted one setting in the loft dialogue. Easy to do!

The reason we get the loft dialogue to present us with the G1 & G2 options is that we use surface edges and not sketch curves for the loft. Tangency (G1)  or surface continuity (G2) only exist between two surfaces, in this case the existing surface the edge belongs to and the to-be lofted surface.

[Doubletop_]

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@TrippyLighting wrote:

As @TheCADWhisperer has already mentioned, please share your model.

This does not mean that we'd be doing your homework, BTW. Although, initially this might have looked like a simple task, lofting can be quite tricky and you've already misinterpreted one setting in the loft dialogue. Easy to do!

The reason we get the loft dialogue to present us with the G1 & G2 options is that we use surface edges and not sketch curves for the loft. Tangency (G1)  or surface continuity (G2) only exist between two surfaces, in this case the existing surface the edge belongs to and the to-be lofted surface.

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Here it is warts and all. I know you are probably going to say "he hasn't been listening" but I've been going round in circles empirically tweaking this and that to see what happens and haven't achieved what I wanted.  You will see that on the dome I've got the tangential loft working but its only a shell and its not joined to the main body. On the chimney again  I can get a shell loft to work but not tangential.

And yes, not activating components has left sketches in the main sketch folder.  Is there a way of retrospectivly moving them to the correct component? I've tried dragging them but they don't go.

Thanks again for your assistance.

Pete

[TrippyLighting]

Here's how I would create the skirt for that chimney:

Not sure why that forsaken screencast tool did not record sound. 

[davebYYPCU]

I see the Peter has replied while I was playing around, will watch his video and be surprised.

What are you doing the work in Fusion for,

What is the outcome you are headed for, exercise in Fusion, model engine to manufacture? 3d print?  etc.

I have reconstituted a file as I would do it, with the hindsight your file provides.

Some experienced modelling methods, but not hard to do - follow along the timeline.  Ask questions...

I can not finish either loft surface flange, as there is nothing in your file to tell me what that needs, the Chimney I would figure the taper hole goes through a solid if that's how your going with it. 

The flat flange and 6 bolt holes are an edit later, when I know more detail for that area. (on both?)

Most trains have one boiler, so my components are line astern.....

Bolt holes, if I wrap a flat plate on the boiler under / into the flange, how thick would it be.  

Might help.....

[Doubletop_]

Peter

Thanks for the video, very helpful, but harder to follow without sound. You've answered how to move sketches into components, and you'll see that has generated another post from me. Also how to get rails to work with the intersect function. I'll keep working through it. But for now I've decided to stop, backtrack and fix things (RULE #1 etc)

Dave

"where am I going with this"? I'm drawing up a loco so that I can better design new parts for it. This is where I'm at, including your version of the chimney.

Its 7.25" gauge, over 1metre long and weighs about 120Kg

Pete

(PS - just noticed an error, the large radius for the chimney and dome are different, I have them the same at the moment)

@TrippyLighting  @davebYYPCU 

[davebYYPCU]

All easy fixed with quick edit.

So will need the 2 boiler O/D and the thickness of the bolt flange can get it from Peters video, - the 6 bolts are a bit tricky.  Actually it is the Whisterer's chimney.

Might help....