One Sketch wont constrain and cant loft Help

[Lunar.Wolf.Works]

Howdy all, Last time i needed help on here you guys were awesome, and its a similar thing i need help with.

Im trying to make a shell to put a led bar in for a scale street lamp and im trying to loft the top of it so its a nice shape.

The sketch for the x axis of the loft is fully constrained and has no problem, but my sketch on the z axis wont constrain for some reason, so when i go to loft i get a " The operation failed. Try adjusting the values or changing the input geometry", all the lines are intersecting from what i can tell but im getting this problem

I have attached the f3d file for this project. im not sure what im doing wrong but its something and i cant work it out or found a solution when searching.

Thank you very much and hope you all have a good day!

[Lunar.Wolf.Works]

Ive got it now so that both sketches are constrained but still getting the loft error, File is attatched

[laughingcreek · Accepted solution]

rails have to be curvature continuous.  the profile of the body you are using as the rail comes to a point at each end.  in the attached I added a center line to sketch 20 and changed the profiles I picked for the loft to get it to work.

[Lunar.Wolf.Works]

Ahh so i need a continuous curve to make it work? you've used the upright curve as the rail instead of the perimeter like i was trying to? Thank you very much for the help, Are their many videos on these kind of things or are you well versed in fusion?

[etfrench]

I'd vote for well versed 😁

[Lunar.Wolf.Works]

Ive tried to do it myself from using the profiles you have used but it will not work, it gives me errors

[Lunar.Wolf.Works]

Ive had to alter the design so i went back quite a lot of steps and followed what you have done but nothing wants to work for some reason

[Lunar.Wolf.Works]

Attached i have the file, i have to have the back piece square to put a 10mm hole on the left plane. even when i use the file you did and de select and re select the profiles it wont loft, im not sure what im doing wrong, would it be best to do a screen cast?

[Lunar.Wolf.Works]

forgot to tag u in new comment

[g-andresen]

Hi,

maybe that's the reason > deselect!

günther

[Lunar.Wolf.Works]

Added screen cast

[Lunar.Wolf.Works]

tried but didnt make a difference on the one old mate did for me, i had to select one side then the upright profile then the otherside,not on my new model its saying that rails cant be tangent to profiles, 

[davebYYPCU]

No access to your file for a few hours yet, but first thing I saw in the video, is what looks like an attempt to Loft with hollow or incomplete profile 1.

Try building one profile that closes the square opening.

Might help....

[Lunar.Wolf.Works]

no problem, yeah i got the back bit lofted but cant get the front half lofted, now its saying one or more rails intersect a profile more then once, try adjusting the sections to avoid this, or now its saying cannot be tangent to profiles

[g-andresen · Accepted solution]

Hi,

I see this:

günther

[davebYYPCU]

Yeah, I thought so, 

@Lunar.Wolf.Works  build full profile to the centre line, because Loft can not do a hollow type of profile.  Especially as the profile 1 and 3 are at 180 degrees apart.

[Lunar.Wolf.Works]

I feel dumb now 😂, Thank you very much for the help, will note for next time can loft hollows

[davebYYPCU]

No Sir, 

much better to ask, than to fumble around - and never know why.