Unable to scale sketch without destroying the sketch

[sharscott2]

I am attaching a file of a fuselage half that I have sketched. I want to scale it up by 1.1099. Everything I have tried causes to sketch to go completely wonky. I understand this is from constraints. The sketch is far too complex to try and individually eliminate every constraint...besides, everything I was taught in fusion 360 was to constrain and dimension. Now, I find I  have to eliminate constraint in order to scale the sketch. For anyone wondering why I didn't correctly scale the sketch at the outset....I DID! The dimensions constantly change even though I have the initial dimension determining the scale checked in preferences. Unknown why Fusion allows dimensions to "float".

[sharscott2]

here is the extruded model from the sketch so everything is constrained and extrudable although many of the lines are blue until I extrude them and then they turn black.

[davebYYPCU]

Which sketch? All of them?

Not many black sketch articles there, and

you are working way to hard with the cart before the horse.

Checked both files, where is the outline skin?

Might help....

[sharscott2]

hmmm....in answer to your first question, yes, I want to scale up the entire sketch entity by 1.1099 factor. I realize there are a lot of blue lines yet everything extrudes so I am at as loss as to why blue isn't black. It is a complex sketch and there may be a much easier way to do this but being new to CAD, I am learning. I haven't skinned it yet because I wanted to get the underlying structure correct since this model will be built. Does the skin matter when scaling? Thanks for responding.

[davebYYPCU]

One aircraft, one file.  

All canvasses aligned and accurate, for complete model.  Where is back half Canvass?

In cad we build from outside > inwards.  

Then cut / mould parts and construct inside to outside.

Much easier to get accuracy from outside smooth skin, than many individual formers, usually it’s lumpy.  I think you did the wing skins first, can’t remember.

Skins first, stringer / longerons / spars next, formers / ribs take their shape from the Skins.

Wing seat must take shape from the finished wing. Tail seat from stabiliser.

Do your wing seat formers, match the wing?  If you don’t know, cart is before the horse.

If you trust the blue prints you might get same result,

I could never get them right your way.

Scaling does not work in this situation.

Blue sketch articles are totally unstable, black articles will behave.  

Because you Extrude from blue sketch articles does not mean anything.

You will be much quicker to start over at correct size.  

You say you started correct, so how did it get to be wrong?,

(Dimension typo? Or no dimensions?)

Might help....

[sharscott2]

ok good info....I am only rebuilding the front half so no need for anything
behind the front of the canopy. The wing saddle is derived from the root
rib that is used in the wing. I clearly didn't understand that using a skin
first is the correct way then build in formers, bulkheads ect later.
Initially, I started with a front view, side view, top view canvases all
aligned with the origin and all scaled to the same size. Somewhere in the
design, the dimensions I scaled the model to changed which is no bueno. I
thought the initial dimension set the scale. Why do blue lines allow me to
extrude if they are not constrained? I thought only constrained lines can
be extruded and the blue lines turn black when I extrude so that is a
mystery to me, as well. Starting over is no stranger to me...I think I have
started the wing and fuselage on this project maybe a dozen times but that
is how I learn. Thanks

[davebYYPCU · Accepted solution]

When extruding, yes Select the profile, it shows a temporary black outline, but when done the sketch stays blue.  (Hide the body to check).

Draw a line, add dimension and constraints.  Turns black.  

To scale that line, Edit the dimension, say its 348 long, to scale it, type 348 * 1.1099, and it will adjust.

Might help....

[TrippyLighting]

@davebYYPCU the OP returns every few weeks with the same or similar model and when I catch the thread, I suggest that he starts with a simpler project and start building foundational skills so the more complex projects don't end up being the disasters they are.

Unfortunately that advice isn't taken... or at least progress isn't visible to me.

[sharscott2]

Sorry I irritate you, Trippylighting....I know I am a beginner and I also know that I could spend a few months learning to sketch cubes, triangles, circles, ect and then maybe come back and impress all with my wizardry but this is the project I have sought to learn Fusion for...My knowledge of what to do has increased substantially from my first tentative steps many months ago and I AM LEARNING so maybe instead of banging on a beginner, you just stop responding to my posts.  I am sorry, I don't mean to offend you as I realize you are one of the experts here and I am trying to incorporate your suggestions but moving off this project until I am ready for it isn't going to happen.

[TrippyLighting]

You are  not irritating me.  I intentionally addressed my post to @davebYYPCU.

Being a beginner is not a problem. Not heeding advice is a problem. Not for me, but for you!

If you had followed my advice in other threads, you'd me much further along.

[davebYYPCU]

So, checked the file again, 

you can scale all the bodies as you wish, but you lose all sketch relationships, after this operation. (Dangerous hack!)

So Trying to find out why the canvass doesn't match the bodies, I found out you have already done that.

So - you scaled the bodies, you have already found out the sketches did not follow, and that is why you asked this question.  I have checked a number of sketches for dimensions, not found any yet, but found a lot of empty sketches.

If you can't put a canvass on a centre line, ....

CAD relies on stable accuracy; you don't have either.

Seriously?  

[sharscott2]

I am not sure why I keep getting empty sketches (I delete them from time to time... Clearly, my sketches are not stable which is why I am struggling with this. I took your advice and am starting all over rather than trying to fix this one.

[davebYYPCU]

Ok.....